3710r/3710vr/3750 refrigerated samplers · 2009. 3. 16. · of the sampler, and a list of technical...

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3710R/3710VR/3750 Refrigerated Samplers Instruction Manual Part #60-3713-046 of Assembly #60-3714-032 Copyright © 1996, 2001. All rights reserved. Isco, Inc. Revision S, February, 2002

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  • 3710R/3710VR/3750Refrigerated Samplers

    Instruction Manual

    Part #60-3713-046 of Assembly #60-3714-032Copyright © 1996, 2001. All rights reserved. Isco, Inc.Revision S, February, 2002

    http://www.isco.com

  • Foreword

    This instruction manual is designed to help you gain a thorough understanding ofthe operation of the equipment. Isco recommends that you read this manual com-pletely before placing the equipment in service.

    Although Isco designs reliability into all equipment, there is always the possibility ofa malfunction. This manual may help in diagnosing and repairing the malfunction.

    If the problem persists, call or email the Isco Customer Service Department forassistance. Contact information is provided below. Simple difficulties can often bediagnosed over the phone. If it is necessary to return the equipment to the factoryfor service, please follow the shipping instructions provided by the Customer Ser-vice Department, including the use of the Return Authorization Number speci-fied. Be sure to include a note describing the malfunction. This will aid inthe prompt repair and return of the equipment.

    Isco welcomes suggestions that would improve the information presented in thismanual or enhance the operation of the equipment itself.

    Contact Information

    Phone: (800) 228-4373 (USA, Canada, Mexico)(402) 464-0231 (Outside North America)

    Repair Service: (800) 775-2965 (Analytical and Process MonitoringInstruments)

    (800) 228-4373 (Samplers and Flow Meters)Fax: (402) 465-3022Email address: [email protected]: www.isco.comReturn equipment to: 4700 Superior Street, Lincoln, NE 68504-1398Other correspondence: P.O. Box 82531, Lincoln, NE 68501-2531

  • 3710R/3710VR/3750 Refrigerated Sampler

    i

    Table of Contents

    1. Product Description . . . . . . . . . . . . 1Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1Manual Organization. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13710R/3710VR Refrigerated Sampler. . . . . . . . . . . . . . . 1Programmable Features . . . . . . . . . . . . . . . . . . . . . . . . . 1

    Flexible Sampling Intervals. . . . . . . . . . . . . . . . . . 2Accurate Sample Volumes . . . . . . . . . . . . . . . . . . . 2Flexible Start Times. . . . . . . . . . . . . . . . . . . . . . . . 2Foreign Languages & Metric Units of Measure . . 2

    Delivery System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Liquid Detector. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Pump Tubing and Suction Lines . . . . . . . . . . . . . . 3Weight Table Shut-Off . . . . . . . . . . . . . . . . . . . . . . 3Strainers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Bottle Configurations . . . . . . . . . . . . . . . . . . . . . . . 3Power Sources. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

    3750 Sampler Refrigerator . . . . . . . . . . . . . . . . . . . . . . . 3Interfacing Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . 4

    Isco Flow Meters. . . . . . . . . . . . . . . . . . . . . . . . . . . 4Isco Field Printers Produce Sampling Reports. . . 4SAMPLINK and Laptop Computers . . . . . . . . . . . 4583 Field Interrogator . . . . . . . . . . . . . . . . . . . . . . 5Non-Isco Flow Meters. . . . . . . . . . . . . . . . . . . . . . . 5Liquid Level Actuator . . . . . . . . . . . . . . . . . . . . . . 5

    Technical Specifications, Controls, and Connectors . . . . . . . . . . . . . . . . . . . . . . 5

    2. Setup and Operating Procedures . . . . . . . . . . . . 8Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Summary of Setup Procedure . . . . . . . . . . . . . . . . . . . . . 8Attaching the Suction Line . . . . . . . . . . . . . . . . . . . . . . . 8Attaching the Vinyl Suction Line to the Pump Tubing .8Attaching the Teflon Suction Line to the Pump Tubing 9Placement of the Suction Line and Intake . . . . . . . . . . . 9

    Strainers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Attaching the Debris Deflector to the Strainer . . . . . . . 9

    Weighted Strainer Optional. . . . . . . . . . . . . . . . . 10Intake Placement . . . . . . . . . . . . . . . . . . . . . . . . . 10

    Connection to a Power Source . . . . . . . . . . . . . . . . . . . . 10Connection to a Flow Meter or Flow Logger. . . . . . . . . 10Operation of the Refrigerator . . . . . . . . . . . . . . . . . . . . 12

    Automatic Defrosting . . . . . . . . . . . . . . . . . . . . . . 12Set Up for Automatic Sampling . . . . . . . . . . . . . . . . . . 12

    Locking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Automatic Sampler Shut-Off. . . . . . . . . . . . . . . . . . . . . 12

    3. Programming Guidelines . . . . . . 14Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14Description of Sampling Operations . . . . . . . . . . . . . . . 14Sample Events and the Sampling Cycle . . . . . . . . . . . . 14Types of Samples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

    Types of Sample Pacing . . . . . . . . . . . . . . . . . . . . 15Types of Sampling Available Through the Extended

    Programming Mode. . . . . . . . . . . . . . . . . . . . . . . . . . 15

    Nonuniform Time Intervals . . . . . . . . . . . . . . . . 15Stops and Resumes . . . . . . . . . . . . . . . . . . . . . . . 15

    Programming Introduction. . . . . . . . . . . . . . . . . . . . . . 15Operating States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Standby State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Run State. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Interactive State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

    Programming Modes . . . . . . . . . . . . . . . . . . . . . . 16Extended Programming . . . . . . . . . . . . . . . . . . . 16Configure Sequence. . . . . . . . . . . . . . . . . . . . . . . 16

    Introduction to the Programming Procedure . . . . . . . 19Using the Keypad to Respond to Displays. . . . . . . . . . 19Keypad Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

    Control Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Program Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Numeric Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

    Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Informational Displays . . . . . . . . . . . . . . . . . . . . 20Input Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Display Numbers. . . . . . . . . . . . . . . . . . . . . . . . . 22Displays with Choices . . . . . . . . . . . . . . . . . . . . . 22Numeric Input Displays . . . . . . . . . . . . . . . . . . . 22Editing Numbers . . . . . . . . . . . . . . . . . . . . . . . . . 22Military Times. . . . . . . . . . . . . . . . . . . . . . . . . . . 22Exit Program Key . . . . . . . . . . . . . . . . . . . . . . . . 22

    Programming Examples . . . . . . . . . . . . . . . . . . . . . . . . 23Basic Programming Procedure. . . . . . . . . . . . . . . . . . . 23

    Sample Volume . . . . . . . . . . . . . . . . . . . . . . . . . . 25Suction Head . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25Calibration Settings . . . . . . . . . . . . . . . . . . . . . . 25

    Configure Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . 32Set Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33Bottle Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

    Portable or Refrigerated Sampler . . . . . . . . . . . 33Bottle Volume . . . . . . . . . . . . . . . . . . . . . . . . . . . 33Cumulative Error . . . . . . . . . . . . . . . . . . . . . . . . 33

    Suction Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33Liquid Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

    Enable/Disable Detector . . . . . . . . . . . . . . . . . . . 34Rinse Cycles. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34Enter Head Manually . . . . . . . . . . . . . . . . . . . . . 34Sampling Retries . . . . . . . . . . . . . . . . . . . . . . . . . 34

    Programming Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 34Load Stored Program . . . . . . . . . . . . . . . . . . . . . . . . . . 36Save Current Program . . . . . . . . . . . . . . . . . . . . . . . . . 37Flow Mode Sampling . . . . . . . . . . . . . . . . . . . . . . . . . . 38

    Sample at Start Time . . . . . . . . . . . . . . . . . . . . . 38Nonuniform Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38Calibrate Sampler. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38Sampling Stop/Resume. . . . . . . . . . . . . . . . . . . . . . . . . 38

    Enable/Disable. . . . . . . . . . . . . . . . . . . . . . . . . . . 38Sample at Stop . . . . . . . . . . . . . . . . . . . . . . . . . . 38Sample at Resume. . . . . . . . . . . . . . . . . . . . . . . . 38

    Start Time Delay. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38Enable Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

    Sample Upon Disable . . . . . . . . . . . . . . . . . . . . . 39Sample Upon Enable. . . . . . . . . . . . . . . . . . . . . . 39Reset Sample Interval. . . . . . . . . . . . . . . . . . . . . 39Inhibit Countdown . . . . . . . . . . . . . . . . . . . . . . . 39

    Event Mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39Continuous/Pulse Signal. . . . . . . . . . . . . . . . . . . 39

  • 3710R/3710VR/3750 Refrigerated Sampler

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    Continuous Signal Timing. . . . . . . . . . . . . . . . . . 39Pulse Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

    Purge Counts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40Tubing Life. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40Program Lock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40Sampler ID. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

    Acceptable Characters . . . . . . . . . . . . . . . . . . . . . 41Run Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

    Software Revision Number . . . . . . . . . . . . . . . . . 41Test RAM and ROM. . . . . . . . . . . . . . . . . . . . . . . 41LCD Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41Pump Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41Re-initialize Controller . . . . . . . . . . . . . . . . . . . . 41

    Exit Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41Extended Programming Mode . . . . . . . . . . . . . . . . . . . 44Extended Mode Sample Pacing. . . . . . . . . . . . . . . . . . . 44Extended Mode Sample Volumes . . . . . . . . . . . . . . . . . 44Extended Mode Key Times . . . . . . . . . . . . . . . . . . . . . . 44

    Determining the Number ofSamples with Stops and Resumes . . . . . . . . . 44

    Start Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46Nonuniform Clock Times and Disable Signals. . 47

    Foreign Languages & Metric Units of Measure. . . . . . 49Programming Examples . . . . . . . . . . . . . . . . . . . . . . . . 49Standby State. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

    Standby Display . . . . . . . . . . . . . . . . . . . . . . . . . . 55Program Halted . . . . . . . . . . . . . . . . . . . . . . . . . . 55Additional Displays . . . . . . . . . . . . . . . . . . . . . . . 56Problem Occurred. . . . . . . . . . . . . . . . . . . . . . . . . 56Float/Weight Tripped. . . . . . . . . . . . . . . . . . . . . . 56

    Display Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57Display Status and Reviewing or Printing Program

    Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57Source of Sample Event. . . . . . . . . . . . . . . . . . . . . . . . . 58Error Messages and Missed Samples . . . . . . . . . . . . . . 59Run State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

    4. Routine Maintenance. . . . . . . . . . 61Routine Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . 61Weather and Corrosion Resistance. . . . . . . . . . . . . . . . 61Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

    Tubing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61Sample Bottles . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

    Cleaning Protocols for Priority Pollutants . . . . . . . . . . 61Proper Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . 61Cleaning Examples . . . . . . . . . . . . . . . . . . . . . . . 61

    Cleaning the Refrigerator . . . . . . . . . . . . . . . . . . . . . . . 62Cleaning the Bottle Locating Base and Sample

    Bottles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62Replacement of Pump Tubing . . . . . . . . . . . . . . . . . . . . 63

    Inspection of Pump Tubing . . . . . . . . . . . . . . . . . 63Removing the Pump Tubing . . . . . . . . . . . . . . . . . . . . . 63Installing a New Pump Tube . . . . . . . . . . . . . . . . . . . . 63Replacement of Suction Line. . . . . . . . . . . . . . . . . . . . . 63

    Cleaning Suction Line. . . . . . . . . . . . . . . . . . . . . 65Replacement Vinyl Line . . . . . . . . . . . . . . . . . . . 65Replacement Teflon Line . . . . . . . . . . . . . . . . . . 65

    1/4 and 3/8 Inch ID Vinyl Suction Line . . . . . . . . . . . . 65Bulk Suction Line . . . . . . . . . . . . . . . . . . . . . . . . 65

    3/8 Inch ID Teflon Suction Line . . . . . . . . . . . . . . . . . . 65Changing the Internal Desiccant. . . . . . . . . . . . . . . . . 65

    Renewing the Desiccant . . . . . . . . . . . . . . . . . . . 65

    5. Options and Interfacing Equipment. . . . . . . . . . . 68Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68Flow Meter Connections . . . . . . . . . . . . . . . . . . . . . . . . 68Isco Flow Meter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68Non-Isco Flow Meters . . . . . . . . . . . . . . . . . . . . . . . . . . 68Interface Devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69Model 1640 Liquid Level Actuator. . . . . . . . . . . . . . . . 69

    6. Servicing . . . . . . . . . . . . . . . . . . . . . 71Servicing Information. . . . . . . . . . . . . . . . . . . . . . . . . . 71Electrical System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71Refrigeration System . . . . . . . . . . . . . . . . . . . . . . . . . . 71Servicing the 3710 Controller . . . . . . . . . . . . . . . . . . . 71

    If Serious Problems Occur . . . . . . . . . . . . . . . . . 71Installing a 3710 Controller on the 3750 Refrigerator 74Access to Electronic Components. . . . . . . . . . . . . . . . . 74Removal of the Pump Gear Case Assembly . . . . . . . . 76Precautions for Servicing CMOS Circuitry . . . . . . . . . 77Preliminary Electronics Troubleshooting Steps . . . . . 77Circuit Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

    Main Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77Pump Control Board . . . . . . . . . . . . . . . . . . . . . . 78

    Sample Event Cycle and Delivery of Sample Volumes 82Peristaltic Pump . . . . . . . . . . . . . . . . . . . . . . . . . 82Volumetric Determination . . . . . . . . . . . . . . . . . 82Sample Delivery . . . . . . . . . . . . . . . . . . . . . . . . . 82

    Replacement Parts List . . . . . . . . . . . . . . . . . . . . . . . . 82Accessory Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

    A. Replacement Parts . . . . . . . . . . . . 84

    B. Accessories List. . . . . . . . . . . . . . . 93

    C. Display Index. . . . . . . . . . . . . . . . . 95

    D. Calculating Flow Increment Between Samples101

    E. Glossary . . . . . . . . . . . . . . . . . . . . 103

    F. Material Safety Data Sheets . . . 104

  • 3710R/3710VR/3750 Refrigerated Sampler

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    List of Figures1. Tube Coupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92. Tube Coupling with Suction Line and Pump

    Tubing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93. Polypropylene Strainer with Debris Deflector. . . . 104. Polypropylene Strainer with Debris Deflector

    in Place . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105. Stainless Steel Strainer . . . . . . . . . . . . . . . . . . . . . 106. Flow Meter Cable Connection and Suction

    Line Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117. Sampler Shut-off Calibration . . . . . . . . . . . . . . . . . 138. Interactive State Structure. . . . . . . . . . . . . . . . . . . 179. 3710R/3710VR Sampler Control Panel . . . . . . . . . 21

    10. Basic Programming Mode: Program Sequence Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

    11. Event Mark Signal Output . . . . . . . . . . . . . . . . . . . 4012. Extended Programming Mode: Program

    Sequence Structure . . . . . . . . . . . . . . . . . . . . . . . 4513. Simplified Start Time Diagram . . . . . . . . . . . . . . . 4614. Start Time Diagram . . . . . . . . . . . . . . . . . . . . . . . . 4715. Start Time Diagram for Nonuniform Clock Time

    Routines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4816. Liquid Detector and Pump Case. . . . . . . . . . . . . . . 6417. Interior of Liquid Detector and Pump Case. . . . . . 6418. Location of 10 Screws on Control Box Bezel . . . . . 6619. Control Box Internal Desiccant . . . . . . . . . . . . . . . 6720. Pin Location for 6-pin Connector . . . . . . . . . . . . . . 6821. Type A Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . 7022. 4-20 mA Sampler Input Interface . . . . . . . . . . . . . 7023. Refrigeration Schematic Diagram . . . . . . . . . . . . . 7124. 3710R/3710VR/3750 Electrical Schematic –

    From S/N 196C01812 . . . . . . . . . . . . . . . . . . . . . . 7225. 3710R/3750 Electrical Schematic –

    Before S/N 196C01812 . . . . . . . . . . . . . . . . . . . . . 7326. Mounting the Control Box . . . . . . . . . . . . . . . . . . . 7427. Underside of the Control Box Cover. . . . . . . . . . . . 7528. Main Circuit Board . . . . . . . . . . . . . . . . . . . . . . . . . 7529. Control Box Tray Removal . . . . . . . . . . . . . . . . . . . 7630. Optical Counter PCB Component Layout . . . . . . . 7833. Case Schematic Diagram . . . . . . . . . . . . . . . . . . . . 8134. Time Line. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

    List of Tables1. Technical Specifications . . . . . . . . . . . . . . . . . . . . . . 62. Controls and Connectors. . . . . . . . . . . . . . . . . . . . . . 73. Safe Depths of Submersion for Suction Line . . . . . . 84. Configure Option Functions . . . . . . . . . . . . . . . . . . 185. Standard Bottle Volume Settings. . . . . . . . . . . . . . 336. Sampling Capabilities available through the

    Program Sequence . . . . . . . . . . . . . . . . . . . . . . . . 357. Factory Program Sequence Settings . . . . . . . . . . . 428. Factory Configure Option Settings. . . . . . . . . . . . . 439. Run State Displays: Composite Sampling . . . . . . . 60

    10. 6-Pin Printer Connector Wiring . . . . . . . . . . . . . . . 6911. 6-Pin Flow Meter Connector Wiring . . . . . . . . . . . 69

    List of Examples1. Checking the Configure Option Settings . . . . . . . 262. Time-paced Sampling . . . . . . . . . . . . . . . . . . . . . . 283. Flow-paced Sampling. . . . . . . . . . . . . . . . . . . . . . . 304. Calibration Procedure . . . . . . . . . . . . . . . . . . . . . . 315. Loading a Stored Program. . . . . . . . . . . . . . . . . . . 366. Saving a Current Program . . . . . . . . . . . . . . . . . . 377. Extended Time-paced Sampling . . . . . . . . . . . . . . 498. Nonuniform Time-paced Sampling . . . . . . . . . . . . 519. Entering Nonuniform Times as Specific Clock

    Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5210. Extended Time-paced Sampling Using Stops

    and Resumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5311. Program Started Later than Programmed

    Start Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5612. Program Started Later than Programmed

    Stop Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5713. Display Status: Results of Sampling Program . . . 58

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  • 3710R/3710VR/3750 Refrigerated Sampler

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    Chapter 1 Product DescriptionINTRODUCTION

    This chapter contains a brief discussion of theorganization of the manual, an overall descriptionof the sampler, and a list of technical specifications.

    MANUAL ORGANIZATIONThis manual contains the information necessary tooperate, maintain, and service the 3710R/3710VR/3750 Refrigerated Sampler.

    The manual has six chapters:

    Chapter 1 is a general introduction to the sam-pler and refrigerator.

    Chapter 2 concerns preparation for use, operatingthe refrigerator, and operating the automaticrefrigerated sampling.

    Chapter 3 covers programming guidelines.

    Chapter 4 contains routine maintenance informa-tion for the 3710R/3710VR/3750.

    Chapter 5 discusses optional equipment that willinterface with the sampler.

    Chapter 6 includes servicing information to assistyou in correcting problems. It also contains anaccessories list and an illustrated list of replace-ment parts.

    DESCRIPTIONThe 3710R/3710VR consists of a 3750 refrigeratorand a 3710 controller mounted on the refrigerator.This instruction manual covers the four configura-tions in which the refrigerator is available: the3710R, the 3710VR, the stainless steel 3750, andthe vinyl 3750. Each configuration is discussedindividually in the following sections.

    3710R/3710VR REFRIGERATED SAMPLERThe 3710R/3710VR/3750 Refrigerated Sampler isa programmable liquid sampler designed for com-posite sampling. It is one of Isco’s 3700 Series ofportable and refrigerated samplers. The extensivesampling capabilities, flexible programming, anddurable construction make the sampler ideallysuited for general purpose or priority pollutantsampling.

    The sampler, although extremely easy to use,offers a number of very sophisticated features. Thefollowing sections introduce key features and pro-vide an overview of the unit’s sampling capabilitiesand a variety of interfacing equipment. Examplesof interfacing equipment include Isco flow meters

    for flow proportional sampling and sampler enablecontrol, Isco Field Printers that print the sampler’sprogram settings and sampling results, and laptopcomputers which collect and store the same data. Abrief discussion of this interfacing equipment isplaced at the end of this chapter.

    The 3710R Refrigerated Sampler consists of the3750 Stainless Steel Refrigerator with the 3710controller installed on the refrigerator at the fac-tory. The 3710VR Refrigerated Sampler consists ofthe 3750 Vinyl Refrigerator with the 3710 control-ler installed at the factory. (The 3750 is discussedin 3750 Sampler Refrigerator on page 3.) The con-troller is housed in the watertight control boxmounted on the top of the refrigerator. However,the refrigerator’s lower compartment is not water-tight.

    The controller consists of a microprocessor withsoftware embedded in a PROM (ProgrammableRead-Only Memory) and supporting electronics.The controller runs the pump, responds to the key-pad, and presents information on the display. Itgoverns all automatic sampling according to user-selectable program settings. The controller alsoprovides for manual control of the sampler; forinstance, you can run the pump forward with thePUMP FORWARD key or initiate a manual samplewith the MANUAL SAMPLE key.

    The control panel, containing the 40-characteralphanumeric LCD (Liquid Crystal Display) andkeypad, is located on the top of the control box.The 23-position keypad is used to enter programparameters and direct the following controls: on/off, pump reverse, pump forward, stop the pump,start sampling, resume sampling, and display theoperating status. A desiccator is installed in thecontrol box to prevent moisture damage to theelectronics and pump.

    PROGRAMMABLE FEATURESAn intuitive user-interface allows the sampler tobe programmed for both simple and complex sam-pling schemes. The LCD prompts you through theprogramming process by presenting a choice or aquestion on the sampler’s LCD. Programming thesampler is a matter of responding to displayedprompts with the keypad. Two programmingmodes, “basic” and “extended,” are standard withthe sampler. The basic programming mode allowsyou to set up typical sampling routines easily andefficiently.

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    The extended programming mode expands the ver-satility of the sampler by providing options whichallow you to create complex sampling routines.

    The LCD not only prompts you through the pro-gramming process, but also allows you to closelymonitor a sampling routine as it is executed. TheLCD displays pertinent information about the rou-tine – for example, the time of the next sample –and notifies you of any problems encountered dur-ing the routine. As the routine progresses, thesampler logs (stores) key information about theresults of the routine. The results include the starttime, any halt and resume times, time of samples,and cause of any missed samples. This informationis accessible during a routine or after a samplingroutine is finished. You can view this informationfrom the sampler’s display or retrieve it with theField Printer or a laptop computer running Isco’sSAMPLINK® software.

    Flexible Sampling Intervals

    The 3710R/3710VR is designed for composite sam-pling. Samples may be collected at user-definabletime intervals (time-pacing) or at equal flow vol-ume intervals using flow pulse inputs from anexternal flow meter (flow-pacing). The flow intervalmay be set from 1 to 9999 flow pulses. Samplingcan be terminated by a weight table shut-off mech-anism or by a user-defined number of samples.

    The sampler offers two types of time-pacing: uni-form and nonuniform. Uniform time-paced sam-ples may be taken at regular time intervals, asample every 15 minutes, for example. The inter-val between samples can be set from 1 minute to99 hours, 59 minutes in 1 minute intervals. Usingthe extended programming mode, you can specifyup to 999 (or bottle volume dependent) non-uni-form time intervals in minutes. For example, youcan program the sampler to take the first six sam-ples at 10 minutes intervals, then four more sam-ples at 15 minute intervals, and so on. Non-uniform time intervals can be from 1 to 999 min-utes in 1 minute intervals. Nonuniform times canbe specified in a clock-time format by entering atime and date for each sample. The sampler willaccept up to 99 nonuniform clock times.

    Additionally, the Sampling Stops and Resumesfeature allows you to create an intermittent sam-pling schedule. With this extended programmingfeature, you can sample only during key periods ofthe day. For example, you may wish to sample onlyduring the hours of 6:00 AM to 8:00 AM, and 5:00PM to 7:00 PM. You can enter up to 12 samplingstops and 12 resumes. Sampling stops and

    resumes can be used with both flow- and time-paced routines and with uniform and nonuniformtime intervals.

    Accurate Sample Volumes

    The sampler can be programmed to take samplevolumes of 10 to 9990 milliliters. Equipped withthe patented LD90 liquid presence detector, thesampler delivers accurate, repeatable sample vol-umes in changing head conditions. The LD90 is anon-wetted liquid presence detector. It detects vir-tually any pumpable liquid and because it is non-wetted; sample conductivity, viscosity, tempera-ture, and composition do not affect detection.Although it is not normally necessary, samples canbe calibrated, if desired.

    Flexible Start Times

    A sampling routine can be programmed to use aspecific start time and date or a start time delay.The sampler will accept a specific start time anddate up to one month in advance of the currentdate. The start time delay is the period betweenthe time you press the START SAMPLING key andthe time the routine actually starts. It is adjust-able from zero to 9999 minutes.

    Other features are available. Program storageallows you to store up to three separate programs,eliminating the need to reprogram the sampler forrecurrent sampling routines. A program lock isavailable for protection from unauthorized pro-gram alterations. When enabled, a password mustbe entered before any program settings can bechanged, although program settings can be viewedat any time.

    Foreign Languages and Metric Units of Measure

    The sampler provides displays in French, German,and Spanish. Additionally, the software supportsentries in metric units of measure. Samplers usingFrench and German language displays supportmetric units for suction line and suction head mea-surements. Metric units include volumes in millili-ters, suction head and suction line length indecimeters, and suction line inside diameter (ID)in millimeters. Samplers operating with Englishdisplays support either English or metric units forsuction line and suction head measurements.(Sample volume units are always entered in milli-liters, regardless of the selected language.)

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    DELIVERY SYSTEMThe sampler uses a peristaltic pump for sample col-lection. The sample liquid is under pumped flow atall times; there are no metering chambers or grav-ity-fed internal tubing. Each sampling cycle includesan air pre-sample purge and a post-sample purge toclear the suction line both before and after sampling.These features make the sampler ideal for both “sus-pended solids” and “toxic materials” sampling. Crosscontamination between samples is minimized andsites for sediment accumulation in the system areeliminated. Materials in contact with the samplefluid are limited to the strainer, suction line, pumptubing, and collection bottles. The system can beeasily and safely cleaned by simply replacing rela-tively inexpensive lengths of tubing.

    Pump speed is approximately 250 RPM which gen-erates a velocity sufficient to obtain representativesamples. The pumping rate of 3500 ml per minuteis generated when using 3/8 inch ID suction line at3 ft of head. The line transport velocity, using thesame suction line and head, is 2.5 ft per second.Volumetric accuracy is not significantly affected bypump speed since the delivered volume is based ona patented electronic count of the number of pumprevolutions.

    Liquid Detector

    The LD90 gives the sampler the ability to deliveraccurate, repeatable sample volumes regardless ofchanging head conditions. Typical sample volumesare accurate to within 10% of the programmed vol-ume and repeatable to within ± 10 ml. The detec-tor and a programmable setting provide forautomatic rinsing of the suction line when con-cerns of cross contamination arise. A programma-ble setting for sampling retries is available. If thesuction line becomes clogged and no liquid isdetected in the line, the sampler can be pro-grammed to repeat a purge cycle – up to threetimes – to clear the clogged line.

    Pump Tubing and Suction Lines

    The pump tubing is Silastic™ medical grade sili-con rubber. Liquid is transferred from the sourceto the pump through either 1/4 or 3/8 inch ID vinylor 3/8 inch ID Teflon® suction tubing. The pumptubing and suction lines are easily replaced, mini-mizing the need for cleaning. The sampler auto-matically monitors pump tubing wear: a tubingwarning indication is reported on the display whenthe pump revolution count exceeds a user-specifiedwear limit.

    Weight Table Shut-Off

    The weight table shut off provides a sampling fail-safe shut-off in case the container is accidentallyoverfilled. When the container is filled to a select-able, predetermined level, a weight activated con-trol stops the sampling process and a red indicatorlight illuminates to alert you of the full container.

    Strainers

    Two stainless steel strainers are available for pri-ority pollutant applications: a larger unit for nor-mal flow and a smaller unit for low flow situations.An all plastic strainer is available for samplingfrom highly acidic flow streams. A weightedpolypropylene strainer is used for general purposesampling applications.

    Bottle Configurations

    Four sample containers are available: • 9400 ml (2.5 gallon) glass container with

    Teflon lined cap.• 9400 ml (2.5 gallon) polyethylene container

    with unlined cap.• 15,000 ml (4 gallon) polyethylene container

    with unlined cap.• 20,800 ml (5.5 gallon) polyethylene container

    with unlined cap.

    Power Sources

    The refrigerator operates from 120 VAC, 60 Hzpower (optionally 240 VAC, 50 Hz). A 12 VDCpower converter, built into the refrigerator, sup-plies power to the controller.

    In the case of critical sampling, the sampler’s con-troller may be powered by an external 12 VDC bat-tery, as described in Connection to a Power Sourceon page 10. This allows sampling to continue evenif a power failure causes the refrigerator’s coolingsystem to stop functioning. Optionally availablefrom Isco is a Power Fail-Safe unit which, undernormal conditions, trickle-charges an external bat-tery, and, in the event of a line power failure, sup-plies 12 VDC power from the battery to thesampler’s controller. Consult the factory fordetails. More information on Isco power sources isavailable in Isco’s Power Products Guide.

    3750 SAMPLER REFRIGERATORIf you want to convert a presently owned 3710 Por-table Sampler into a refrigerated unit, or to haveboth portable and refrigerated options with thesame controller, the 3750 Sampler Refrigerator isavailable. The 3750 includes all the parts neces-sary to attach the controller from a portable sam-pler to the refrigerator.

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    The exterior of the refrigerator is constructed ofeither stainless steel or vinyl-clad steel. Foamed-in-place insulation stiffens the sample compartment.The plastic interior will not support bacterialgrowth or retain odors. Both the controller coverand sample compartment may be individually pad-locked. The door has a magnetic gasket which sealsagainst a stainless steel bezel.

    The refrigerator’s thermostat is calibrated at thefactory to be accurate at 4oC (39oF). A forced-aircondensing coil and front ventilation allow theunit to be positioned close to a wall or in a cornerwith clearance required only for the controllercover to open. Wrap-around construction of theevaporator plate provides quick and efficient cool-ing of the sample compartment. Defrosting is auto-matic under normal operating conditions. Thetechnical specifications of the 3710R/3710VR/3750are found in Table 1.

    INTERFACING EQUIPMENTA full line of accessories and interfacing equip-ment is available to help you adapt the sampler toyour specific application; some of the more com-mon items are briefly noted below. Other keyaccessories are noted throughout this manual,where appropriate. A full list of accessories isfound in the Accessories List appendix.

    Isco Flow Meters

    The sampler will accept flow pulses from all IscoFlow Meters and Flow Loggers for flow propor-tional sampling. Isco Flow Meters and Flow Log-gers are equipped with a sampler enable feature.They can inhibit a sampler until the level of theflow stream reaches a predetermined height or“set point”; when that height is reached, the flowmeter enables the sampler and starts the sam-pling routine. If the level of the stream falls belowthe set point, the flow meter can disable the sam-pler and halt the routine.

    When equipped with a rain gauge, Isco FlowMeters and Flow Loggers can monitor rainfall. Theflow meter can be programmed to enable the sam-pler when the measured amount of rainfallreaches a predetermined set point.

    Set points or pairs of set points — pairs can belevel and rainfall rates, level and elapsed time,rainfall and elapsed time, and so on — form thesampler enable control condition. A control condi-tion is simply the set of parameters defining theconditions in which a flow meter will enable thesampler. For example, a flow meter can be pro-grammed with a control condition which is satis-

    fied when the flow meter detects 1/4 inch of rainfallin 15 minutes. While level control conditions canbe entered directly at the flow meter front panel,most control conditions must be downloaded to theflow meter from an IBM® compatible computerrunning Isco’s FLOWLINK® software.

    In addition to enable control conditions, Isco’sFlow Meters and Flow Loggers provide an internalmemory module. When programmed with theFLOWLINK software, the flow meters store levelor flow rate readings, rainfall measurements, andsample event data from the samplers. The storeddata, which expands the information availablefrom the sampler’s results displays, can beretrieved with a computer running the FLOW-LINK software. For more detailed information onsampler enable control conditions and dataretrieval, refer to the FLOWLINK InstructionManual provided with the FLOWLINK software.

    Isco Field Printers Produce Sampling Reports

    Isco provides two additional interfacing products,the Isco Field Printer and the SAMPLINK soft-ware, which collect data from the sampler’s mem-ory. The Isco Field Printer is a portable fieldprinter designed to print sampling data from a3700 Series Sampler. You can initiate the reportsfrom either the printer or the sampler.

    The Isco Field Printer prints two reports whichreproduce the data collected by the sampler. Thefirst report lists the current status data and pro-gram settings for the sampling routine. The secondreport lists the sampling results currently stored inthe sampler’s memory. The results include the time,date, and bottle numbers for each sample event andany errors encountered during the routine.

    SAMPLINK and Laptop Computers

    SAMPLINK is designed to run on a laptop computerwhich can be taken to the sampling installation tocollect the data. SAMPLINK collects the data andformats it into two files: a text file and a FLOW-LINK compatible sample event file. The text file canbe loaded into a word processor for editing. SAM-PLINK’s text file contains the same two reports pro-duced by the Field Printer. The first report containssampler status information and program settings.The second report contains the sampling results.Because the text file is pre-formatted into reportform, you can use DOS printing commands to printthe file without editing with a word processor. Thesample event files can be used with FLOWLINK toproduce sampling reports and graphs.

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    583 Field Interrogator

    The 583 Field Interrogator is a small, environmen-tally-hardened field computer. Compatible with3700 Series Samplers, it collects sampling data asa text file. The Field interrogator will print the fileon an IBM PC-compatible serial printer or send itto a computer where the file can be edited with aword processor.

    Non-Isco Flow Meters

    Flow pulses are also accepted from certain non-Isco flow meters; two interface accessories areavailable to convert incompatible (non-Isco) sig-nals to pulses acceptable to the sampler. The TypeA Interface converts pulse duration input; the 4-20mA Sampler Input Interface converts 4-20 mA out-put signals.

    The sampler sends event marks to both Isco andnon-Isco flow meters each time a sample is taken.This information is recorded by the flow meter.The event mark can be adjusted according to thetype of flow meter used.

    Liquid Level Actuator

    Another item, the Liquid Level Actuator, is used toprovide level sensitive control of the sampler. Theactuator can be used as an alternative to a FlowMeter or Flow Logger.

    TECHNICAL SPECIFICATIONS, CONTROLS, AND CONNECTORS

    The technical specifications, controls, and connec-tors of the 3710R/3710VR/3750 are listed inTables 1 and 2. Refer to Figure 6 on page 11 for apictorial view of the controls and connectors.

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    Table 1 Technical SpecificationsPhysical Specifications

    Physical Size:Height: 45.75 inches (116 cm)Width: 24.25 inches (62 cm)Depth: 25 inches (64 cm)

    Dry weight: Stainless Steel: 145 lb (65.8 kg)Vinyl-Clad Steel: 120 lb (54.5 kg)

    Operational Temperature Range: 32oF to 120oF (0oC to 49oC)

    Control Box Only:(does not include refrigerator)

    Self Certified NEMA 4X and 6 ratings(Submersible, watertight, dust-tight, and corrosion resistant)

    Temperature set point accuracy: ± 1.8oF (1oC) at 39oF (4oC)

    Pulldown time from 75oF (24oC) to 39oF (4oC): 30 minutes, typical

    Recovery time, door open 1 minute with unitoperating at 39oF (4oC), 75oF (24oC) ambient: 10 minutes, typical

    Power Specifications

    Sampler Controller Power Requirement: 12 VDC AC power converterSampler standby current 10 mA, maximum

    Voltage: 120 V, 60 Hz (240 V, 50 Hz available)

    Current: Running:Starting:

    2.5 amp, typical 120 volts. (1.25 amp, typical 240 volts)12 amp, typical 120 volts. (6 amp, typical 240 volts)

    Controller Internal 3V Lithium Battery Capacity 5 years, minimum (maintains internal logic and program settings)

    Pump and Tubing Specifications

    Suction Tubing (intake):

    3 to 99 foot lengths of:1/4-inch ID vinyl3/8-inch ID vinyl3/8-inch ID Teflon lined

    Suction Lift: 26 feet (7.9 m), maximum

    Pumping Rate (at 3 feet of head):1/4-inch ID suction tubing: 3000 ml/minute3/8-inch ID suction tubing: 3500 ml/minute

    Line Transport Velocity (at 3 feet of head):1/4-inch ID suction tubing: 5.1 ft /sec3/8-inch ID suction tubing: 2.5 ft /sec

    Clock Specifications

    Real Time Clock Accuracy: 1 minute/month, typical

    Sample Specifications

    Sample Volume Accuracy:With the liquid detector enabled and automatic compensation forhead: typically, the greater of ± 10% or ± 20 ml, over a head range of1 to 12 feet and sampler supply voltage of 10 to 13 volts.

    Sample Volume Repeatability: ± 10 ml, typical.

    Sample Frequency:

    Selectable from one minute to 99 hours, 59 minutes in 1 minuteincrements between consecutive samples, or from 1 to 9999 flowpulses in single pulse intervals. Up to 999 nonuniform times may beentered in minute intervals or up to 99 times as specific clock times.

    Flow Meter Signal Specifications

    Flow Meter Signal Requirements:5 to 15 volt DC pulse or isolated contact closure of at least 25 milli-seconds in duration. (4-20 mA or pulse duration signal may be con-verted with optional interface unit).

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    Table 2 Controls and Connectors

    Controls

    CONTROL SETTING FUNCTION

    Thermostat:OFF, WARMER, COOLER,4oC (39oF).

    Turns the refrigeration system on/off, selectsthe sample temperature.

    Weight Table Automatic Shut-off: Variable.

    Fully adjustable, weight sensitive control stopssampling program when predetermined volumeis reached.

    Connectors

    CONNECTOR TYPE FUNCTION

    12 VDC: 2-pin female cable mounted. 12 VDC power supply for sampler.

    Flow Meter: 6-pin male panel mounted. Connects sampler to external flow meter.

    Printer: 6-pin female panel mounted. Connects sampler to Isco Field Printer or laptopcomputer.

    Sampler: 6-pin female cable mounted. Connects shut-off cable from the weight tableand the flow meter to the sampler’s controller.

    120 or 240 VAC: 3-pin grounded male line cord. Supplies line voltage for the unit.

    Indicator

    INDICATOR TYPE FUNCTION

    Bottle Full Light: Red light.Indicates that composite sample has reachedthe predetermined volume and sampling hasstopped.

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    Chapter 2 Setup and Operating Procedures

    INTRODUCTIONThis chapter provides the information necessaryfor everyday operation of the refrigerator. Includedare sections covering setup, operation of the refrig-erator, and automatic refrigerated sampling.

    SUMMARY OF SETUP PROCEDUREThe following sections detail the preparationsmade before using the refrigerator. To place thesampler into operation:1. Install the sampler.

    Although the suction line can extend to a liquidsource up to 99 feet from the sampler, note thatthe maximum lift for the peristaltic pump witheither the Teflon or vinyl line is 26 feet. Wheninstalling the sampler, be sure the head — thevertical distance between the level of the liquidsource and the pump — is no greater than 26feet. The pump will not be able to deliver sam-ples for heads of 26 feet or greater.

    2. Do not install the refrigerator in a locationwhere the lower compartment could becomesubmerged.

    3. Be sure the sampler is connected to a 120 VACpower source. Turn the refrigerator on.

    4. Attach the suction line. 5. Place the suction line inlet properly in the liquid

    source.6. Connect the sampler to a flow meter, if required. 7. Program the sampler. See Chapter 3.8. Calibrate the sample volume, if desired. Chap-

    ter 3 contains calibration instructions.)9. Calibrate the weight table. See Automatic Sam-

    pler Shut-Off on page 12. 10.Start the sampling routine.

    ATTACHING THE SUCTION LINEThe suction line is the piece of tubing that extendsfrom the sampler’s pump tubing intake, at the topof the liquid detector, to the liquid source. Thereare three standard suction lines available: plasti-cized vinyl tubing in 1/4 inch (0.64 cm) or 3/8 inch(0.94 cm) inside diameters, or FEP Teflon with apolyethylene cover in 3/8 inch inside diameter. Thepolyethylene cover over the 0.02 inch (0.051 cm)wall Teflon tubing prevents the Teflon liner fromkinking or collapsing in service and protects itfrom abrasion and other damage.

    The vinyl suction tubing contains a very low PPM(parts per million) level of phenols. If this affectsyour samples, use the Teflon suction line.

    Both vinyl and Teflon lines can be cut to anylength from 3 to 99 feet in 1 foot increments. Cutthe suction line in whole foot increments: lengthsof 4 feet, not 3.5 feet. The controller will acceptonly whole numbers as suction line lengths. Toensure the accuracy of the sampler, the suctionline length entered must equal that of the actualline measurement. When programming the sam-pler, you must enter the inside diameter, type, andlength of suction line used.

    Cut the line to the shortest length feasible: thisaids the downhill routing. Avoid loops of coiled suc-tion line which may hold residual amounts of liquidwhich would cross contaminate sample volumes. Ashorter suction line will also extend battery life andpump tube life because a shorter pumping cyclewill be needed to deliver the sample volume.

    The suction line tends to float in deep flowstreams, dislodging the line and strainer. Table 3shows the maximum depths you can submerge thelines and strainers without risks of flotation. Atdepths exceeding the safe depths, anchor the lineand strainer securely.

    Table 3 Safe Depths of Submersion forSuction Line

    ATTACHING THE VINYL SUCTIONLINE TO THE PUMP TUBING

    Vinyl suction line is attached to the pump tubingwith the tube coupling as illustrated in Figures 1and 2. Two couplings are available, one for eachsize of vinyl line.

    Strainer

    1/4"Vinyl Line

    3/8"Vinyl Line

    3/8" Teflon Line

    Stainless Steel: ------- 22 feet 15 feet

    Low-Flow Stainless Steel: 14 feet 7 feet -------

    Polypropylene: 22 feet 11 feet -------

    CPVC: ------- 4 feet -------

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    Each coupling has two color coded nylon clampsattached to the stainless steel ferrule. The blackclamp secures the pump tube to the coupling. Thewhite clamp secures the suction line. To attach theline or tubing to the coupling, push it onto theappropriate side of the ferrule and tighten theclamp by squeezing the finger pads together. Toloosen a clamp, twist the two sides of the clampuntil the teeth disengage.

    ATTACHING THE TEFLON SUCTIONLINE TO THE PUMP TUBING

    The Teflon line is attached to the pump tubing byinserting the line into the pump tubing and secur-ing it with a suitable clamp.

    Figure 1 Tube Coupling

    Figure 2 Tube Coupling with Suction Lineand Pump Tubing

    PLACEMENT OF THE SUCTIONLINE AND INTAKE

    Route the suction line from sampler to samplingpoint so that it slopes continuously downhill. Thishelps drain the suction line when the peristalticpump purges the line and minimizes the possibil-ity of cross contamination. When the sampler isused in near freezing temperatures, thoroughlydraining the suction line minimizes the possibilityof frozen liquid clogging the line.

    Strainers

    The 1/4 and 3/8 inch ID (inside diameter) vinyl suc-tion lines are shipped from the factory with apolypropylene bodied weighted inlet strainerinstalled on the end of the suction line, as shown inFigures 3 and 4.

    Optional all stainless steel strainers (see Figure5) are also available for use with the vinyl orTeflon suction lines. For sampling from highlyacidic flow streams, an all plastic strainer is avail-able. Bulk suction line can be purchased withoutstrainers. Refer to the Accessories List appendixmore information.

    The strainer prevents solid particles over a specificdiameter from entering and clogging the suctionline. It is recommended for bottom sampling orsampling from streams containing large solids.The 1/4 inch strainers supplied for use with the 1/4inch ID suction line have 15/64 inch (0.56 cm) diam-eter holes. The 3/8 inch strainers supplied for usewith the vinyl or Teflon 3/8 inch ID suction linehave 23/64 inch (0.9 cm) diameter holes.

    ATTACHING THE DEBRISDEFLECTOR TO THE STRAINER

    A debris deflector prevents debris from accumulat-ing on the hose clamp which attaches the strainerto the suction line. The 3/8 inch polypropylenestrainer is shipped with the suction line attachedand the debris deflector in place.

    To replace the suction line on a strainer with adebris deflector:

    1. Push the deflector back up the line to expose thehose clamp. See Figure 3.

    2. Loosen the clamp and pull the line from thestrainer’s ferrule.

    3. Remove the deflector from the old line andthread it on the new line. Push the deflectorback on the new line; leave enough room towork with the hose clamp.

    4. Thread the hose clamp on the new line.5. Slip the line onto the ferrule and secure it with

    the hose clamp.6. Push the debris deflector down the line and onto

    the strainer. Figure 4 shows the debris deflec-tor in place.

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    Figure 3 Polypropylene Strainer with DebrisDeflector

    Figure 4 Polypropylene Strainer with DebrisDeflector in Place

    Figure 5 Stainless Steel Strainer

    Weighted Strainer Optional

    The use of the weighted strainer is optional. Whenheavy suspended solids are involved and flow streamvelocities are significant, some field investigationresults indicate more representative samples areobtained without the strainer. If the strainer is notused, a short piece of thin walled aluminum tubingmay be attached to the end of the suction line andthe tubing anchored in the flow stream so that theinlet is oriented upstream. The thin wall will provideminimum disturbance of the flow stream and alumi-num ions are usually not of concern in analysis.Whether the strainer is used or not, the pre-samplepurge cycle should be sufficient to remove any debriswhich may collect over the strainer or tubingentrance between sampling events.

    Intake Placement

    The proper placement of the sampler intakeassures the collection of representative samples.The intake should be placed in the main flow, notin an eddy or at the edge of flow. The vertical posi-tion of the intake in the flow is important. Anintake at the bottom may result in excess heavysolids and no floating materials, while placementat the top may result in the opposite.

    CONNECTION TO A POWER SOURCEThe 3750 operates from 120 VAC, 60 Hz power(optionally 240 VAC, 50 Hz). To provide power forthe refrigerator and controller, plug the refrigera-tor’s line cord into an appropriate source. A 12VDC power converter, built into the refrigerator,supplies power to the controller. A 3V lithium bat-tery, with a minimum service life of 5 years, main-tains the controller’s real time clock and programsettings when power is disconnected.The sampler’s controller may be temporarily pow-ered by an external 12 VDC battery when ACpower is not available. Simply disconnect thepower cable shown in Figure 6, and attach thebattery connector to the sampler’s power connec-tor. A rechargeable nickel-cadmium battery ismost commonly used; however, lead acid batteriesare available.Isco’s nickel-cadmium battery has an operatingcapacity of seven standard sampling programsafter an 18-hour charge. (A standard samplingprogram is defined to be 24 samples at a rate ofone 200 ml sample per hour, using 10 feet of 3/8vinyl suction line at a 5-foot head.) The lead-acid battery has an operating capacity of11 standard sampling programs. An Isco 120 VAC50/60 Hz or 240 VAC 50/60 Hz Power Pack can alsopower the sampler. Both power packs may also beused to recharge the Isco batteries.

    CONNECTION TO A FLOW METER OR FLOW LOGGER

    The sampler’s controller must be connected to anexternal flow meter or flow logger to permit flowproportional sampling. This connection is made tothe flow meter connector (shown in Figure 6)located on the rear of the control base. A small portis provided on the right side of the control base forrouting the flow meter cable. Refer to Chapter 5for information on devices to interface the samplerwith non-Isco flow meters.

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    Figure 6 Flow Meter Cable Connection and Suction Line Port

    Flow Meter Connector

    Thermostat Knob

    Power CableFlow Meter

    Control Base

    Flow Meter Cable

    Suction Line Port

    Cable Port

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    OPERATION OF THE REFRIGERATORTo operate the refrigerator, turn the thermostatknob, shown in Figure 6, to the desired sampletemperature. The interior air temperature shouldreach the set value within 20 to 30 minutes. Therefrigerator’s thermostat is calibrated in sampletemperature. That is, if the temperature is set at4oC (39oF), the temperature of the sample afterbeing in the refrigerator will be 4oC ± 1oC,although the refrigerator air temperature mayvary more than this due to the nature of the refrig-eration cycle.

    NOTE

    If the thermostat knob is turned to the lowest set-ting, the sample may freeze.

    Automatic Defrosting

    Under normal conditions, you should not need todefrost the refrigerator manually. The cooling coiltemperature always cycles from below freezing(when the compressor is running) to above freez-ing (when the compressor is off) during the normalrefrigeration cycle.

    If the unit is used in hot, humid conditions, youmay need to defrost the unit after several days ofoperation. Turn the thermostat off and allow therefrigerator to defrost. The refrigerator isequipped with a water diverting tray and a draintube to route defrost water to an evaporating trayin the rear of the refrigerator. Water in the tray isevaporated by the warm air from the condensingsystem. The refrigerator compressor may not startimmediately when the thermostat is turned on orturned to a lower setting due to the action of thecompressor overload relay described in ElectricalSystem on page 71. After a short time, the com-pressor will start and initiate the cooling cycle.

    SET UP FOR AUTOMATIC SAMPLINGBefore the unit is ready to be set up for automaticsampling, check that:

    1. The control box has been attached to the refrig-erator (when necessary).

    2. The refrigerator has been connected to a powersource.

    3. The controller has been connected to an exter-nal flow meter (if used).

    4. The suction line has been attached to the pumptubing.

    5. The weight table shut-off point has beenadjusted as described in Automatic SamplerShut-Off on page 12. An empty sample con-tainer has been properly located on the weighttable and the pump tube inserted approximately2 inches into the hole in the container’s lid.

    6. The thermostat has been adjusted to the desiredsample temperature.

    Locking

    After the sampler has been programmed asdesired and the sampling program started, thecover should be closed and latched in place. Lock-ing holes are provided in the controller cover latchand on the refrigerator door to accept padlocks toprevent unauthorized tampering.

    AUTOMATIC SAMPLER SHUT-OFFThe refrigerator has an adjustable, weight acti-vated sample container table to automaticallyshut-off the sampling process when the samplecontainer is filled to a predetermined level. Whenthe container is filled to the preset level, samplingstops and the LCD displays alternating messages;the message, “DONE,” will alternate with the mes-sage, “FLOAT/WEIGHT TRIPPED.” Calibratingthe automatic shut-off mechanism requires threesteps. Refer to Figure 7.

    1. Fill the container with liquid to the desiredshut-off level. Leave at least three inchesunfilled. Place the container in its normal posi-tion in the bottom of the refrigerator.

    2. If the red CONTAINER FULL lamp on theouter front of the refrigerator is off, proceed tostep 3. If the lamp is on, turn the black thumb-wheel on the front of the weight table to theright until the lamp goes out.

    3. Without touching any portion of the weighttable, carefully turn the black thumbwheel tothe left until the CONTAINER FULL lamp goeson. The calibration procedure is now complete.

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    Figure 7 Sampler Shut-off Calibration

    Thumbwheel Weight Table Container filled withdesired volume of water

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    Chapter 3 Programming GuidelinesINTRODUCTION

    This chapter discusses the sampling features ofthe 3710R/3710VR Sampler in detail and coversthe procedures used to program the sampler.

    We recommend you have a sampler with you whenyou read this chapter. The most effective way tolearn how to program the sampler is to read thischapter, get a sampler, and experiment. A few min-utes in the office or laboratory spent in actuallyprogramming the sampler and observing its opera-tion usually proves to be a worthwhile investmentof time.

    If you are already familiar with the sampling capa-bilities of the sampler, you may prefer to beginwith Programming Introduction on page 15.

    Chapter Organization

    The following topics are discussed in this chapter:

    • Description of Sampling Operations.• Types of Samples.• Programming Introduction.• Operating States. • Introduction to the Programming Procedure. • Using the Keypad to Respond to Displays• Displays. • Programming Examples. • Configure Sequence. • Extended Programming Mode. • Foreign Languages and Metric Units of Measure.• Standby State. • Run State.

    DESCRIPTION OF SAMPLING OPERATIONSThis information serves to acquaint you with thesampler’s operation. It introduces you to the typesof sampling performed by the sampler and the ter-minology used to describe those capabilities.

    SAMPLE EVENTS AND THE SAMPLING CYCLE

    A sample event is the process of taking a sample. Itincludes the full sampling cycle. Although the cyclevaries according to the program settings whichdefine the sampling routine, the cycle describedhere follows the typical sequence. This informationis presented here to provide you with a frame ofreference for the remainder of this chapter.

    1. A sample event is initiated when the intervalsince the previous sample has expired. For timebased intervals, the samples are taken when theinternal clock reaches the scheduled time of thesampling event. For flow-paced intervals, theinterval is set to the programmed number ofpulses received from a flow meter; the sampleevent begins when the pulses are counted downto zero.

    2. The pump rotates in the reverse direction forthe pre-sample purge. The pre-sample purge isan air purge of the suction line and inlet whichclears the line of any accumulated debris. It alsoserves to purge residual liquid to avoid cross-contamination of samples.

    3. The pump direction changes, pumping in theforward direction to fill the suction line up tothe liquid detector.

    4. After the suction line has been filled to the liq-uid detector and liquid has been detected, thesample volume measuring portion of the sam-pling cycle begins. The pump continues to rotatein the forward direction until the programmedvolume of liquid has been delivered to the sam-ple bottle. (In this manual, the amount of liquiddelivered to the bottle is referred to as the “sam-ple volume.”)

    5. The pump direction again changes, pumping inthe reverse direction for the post-sample purge.Like the pre-sample purge, the post-samplepurge is an air purge of the suction line. Afterthe post-sample purge, the pump then shuts off.

    6. The sample interval is reset and the cyclebegins again at step 1.

    TYPES OF SAMPLESThe sampler is designed to collect composite sam-ples. As noted in Chapter 1, the sampler has twoprogramming modes: basic and extended. Thebasic programming mode is used for conventionalroutines which include the types of samplingdescribed in this section. A discussion of the typesof sampling available through the extended pro-gramming mode is placed in Types of SamplingAvailable Through the Extended ProgrammingMode on page 15.

    Composite sampling places individual sample vol-umes into a single container. Composite sampletypes can be characterized by sample pacing. Sam-ple pacing refers to the interval between samples.

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    Types of Sample Pacing

    There are two types of sample pacing: time-pacingand flow-pacing. In time-paced sampling, theinterval between samples is a time interval. Inflow-paced sampling, the interval between sam-ples is a certain volume of liquid which has passeda measuring point in a flow stream. Flow-pacedsampling requires a flow meter. (The sampler canbe interfaced with Isco flow meters and certainnon-Isco flow meters.) The flow meter measuresthe flow quantity and sends a pulse for every pre-determined flow quantity to the sampler. The sam-pler totalizes the number of pulses received fromthe flow meter and collects a sample when thetotal reaches a programmed number.

    TYPES OF SAMPLING AVAILABLETHROUGH THE EXTENDED

    PROGRAMMING MODEThe extended programming mode expands the vari-ations of sample pacing. The extended featureslisted below are used in more complex sampling rou-tines. Note, however, that the sampling capabilitiesdescribed in Types of Samples are available in boththe basic and the extended programming modes.

    Nonuniform Time Intervals

    The sampler, through the extended programmingmode, can pace samples at nonuniform time inter-vals. With nonuniform time intervals, samples aretaken at irregular intervals, rather than at equalintervals.

    Nonuniform time intervals are typically used inrun-off studies, often in conjunction with a Model1640 Liquid Level Actuator. Nonuniform timeintervals permit a number of samples to be col-lected at short intervals after a rainfall or otherevent occurs and remaining samples to be collectedat widening intervals. For example, when the sam-pler is used with the actuator in a run-off study,the actuator turns the sampler on when the liquidlevel of the flow stream rises to contact the actua-tor’s probe. With nonuniform time intervals, thesampler can collect samples frequently when theflow rate is highest and less frequently as the flowrate decreases.

    Nonuniform times can also be used to simulate flow-paced sampling. When the flow rate varies predict-ably, using nonuniform time intervals allows you totake samples at equal flow volumes. As the flow rateincreases, you can take samples at equal flow vol-umes by decreasing the time interval. As the flowrate decreases, you can increase the time interval.

    When you use nonuniform times, the time intervalbetween each sample event is individually pro-grammable. You can enter nonuniform times in twoways: in minutes or in clock times. The firstmethod, minutes, allows you to enter the number ofsample events spaced at intervals defined in min-utes: 12 samples at 5 minute intervals, 6 samplesat 10 minute intervals, 4 samples at 15 minuteintervals, and so on. You can also enter a specificclock time and date for each sample event: sampleevent 1 at 6:00 on April 20, sample event 2 at 6:30on April 20, sample event 3 at 7:15 on April 20. Youcan specify up to 999 sample events spaced in non-uniform minutes, or up to 99 events specified asclock times. (If a routine requires a large number ofnonuniform times, you can save the routine withthe program storage feature so that you do nothave to re-enter the nonuniform times again.)

    Stops and Resumes

    The Sampling Stops and Resumes feature, avail-able in the extended programming mode, allowsyou to create an intermittent sampling schedule.You can program the sampler to stop the routine ata specific time. The routine can then be resumed ata later time.

    Up to 12 stop times and 12 resume times can beentered. Stops and resumes can be used with time-paced and flow-paced routines and with routinesprogrammed for nonuniform time intervals.

    PROGRAMMING INTRODUCTIONThe sampler’s programming process is self-prompting. Prompts displayed on the LCD stepyou through the programming sequence in a logi-cal order, indicating the needed value or option.For example, the sampler will prompt you to entersettings for the interval between samples (selecteither time-paced or flow-paced intervals); samplevolume in ml; and other operating controls. Thesesettings can be changed at any time. The samplerwill accept only appropriate values for the pro-gram settings and will reject any unacceptable val-ues. If the unit is turned off or power isdisconnected, the settings are retained in the sam-pler’s memory by the lithium battery.

    OPERATING STATESThere are three operating states: the standby statewhere the sampler is waiting for your instructions,the run state where the sampler is running a sam-pling routine, and the interactive state used to pro-gram the sampler. Each state serves a differentpurpose and is discussed separately.

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    STANDBY STATEIn the standby state, the sampler is waiting foryour instructions. From standby, you can start asampling routine, placing the sampler in the runstate. You can also access the interactive state. Thestandby state is discussed on page 55.

    RUN STATEIn the run state, the sampling routine is being exe-cuted and the sampler is operating under programcontrol. While the sampling routine is executed,the LCD displays a number of messages to commu-nicate the progress of the sampler through the rou-tine. It reports the current time for time-pacedroutines and the remaining time or pulse count tothe next sample. These messages vary according tothe sampling routine; a representative set of mes-sages is included with the programming examples.See Basic Programming Procedure on page 23 andProgramming Examples on page 23. Table 9 alsolists run state messages.

    As the routine progresses, the sampler creates alog of sampling results that records pertinent infor-mation about each sample event. The resultsinclude the time and date of each sample, the num-ber of pump counts occurring until liquid isdetected for each sample event, and any problemsencountered. Results can be retrieved with the Dis-play Status procedure, discussed on page 57. Youcan retrieve the results in the middle of a routineor when the routine is done. The results remain inthe sampler’s memory until you start the sampleragain. More information on the run state can befound on page 60.

    INTERACTIVE STATEThe interactive state allows you to program thesampler. The interactive state contains twobranches: the program sequence and the configuresequence. Figure 8 diagrams the structure of theinteractive state. The program sequence is used todefine the sampling routine; it allows you to enterthe interval between samples, the number of sam-ples, the sample size, and the start time. The con-figure sequence provides a number of setupoptions. Some configure options provide equipmentspecifications: bottle sizes, suction line diametersand lengths, and so on. For example, the samplercan be used with different sized bottles: 2.5 gallonor 4 gallon. You must enter the correct bottle sizeso that the sampler can calculate the range of sam-ple volumes for a given number of samples. Thisinformation is used to prevent overfilling. Otheroptions allow you to set the sampler’s real time

    clock, calibrate the sampler, or enable the pass-word program protection.

    Programming Modes

    The configure sequence also allows you to selecteither of the programming modes: basic orextended. The basic programming mode is used forconventional sampling routines. Using the basicprogramming mode, you can take samples at uni-form time intervals or at flow pulse intervals. Youcan control the start time of the routine by enter-ing a specific time and date or with the adjustablestart time delay.

    Extended Programming

    The extended programming mode increases thenumber of available features; these features makemore complex sampling routines possible. Forexample, you can use nonuniform time intervals,and create an intermittent sampling schedule withthe Stops and Resumes feature. While all basicprogramming features are available in the extend-ing programming mode, the less frequently usedfeatures have been separated into the extendedmode to simplify the programming process.

    Although the basic and extended programsequences vary in detail, both can be divided intothree sections: Sample Pacing (interval betweensamples), Sample Volume (number of samples andsample size in ml), and Key Times (start times or,in the extended mode, stop and resume times).These sections are noted in the Program Sequencesection of the diagram shown in Figure 8.

    Configure Sequence

    The program sequence and the configure sequenceare interdependent. The selections you make in theconfigure sequence determine what settings will beavailable to you in the program sequence. Whenyou select the extended programming mode, theprogram sequence is modified to accommodate theextended features by adding more input displays.

    The extended programming mode not only extendsthe number of features available in the programsequence, it extends the number of configureoptions. When you select extended programming,for example, you can enable the Sampling Stopand Resumes and/or Nonuniform Times featuresso they can be used in the extended programsequence. When you select the basic programmingmode, these configure options are not available toyou. As in the programming sequence, less fre-quently used options have been separated to sim-plify the configuration process.

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    Most configure options are available to both pro-gramming modes. The configure sequence optionsare summarized in Table 4; each option is markedas available in both modes or available only in theextended mode. A detailed discussion of each con-figuration option is found in Set Clock on page 33through Exit Configuration on page 41.

    It is usually not necessary to change the configureoption settings unless the sampling application

    changes significantly. The sampler is always pro-grammed and configured: program and configuresettings are maintained by the sampler’s internalbattery. In fact, the sampler is shipped with fac-tory program and configure settings. It is config-ured for the basic program mode and for the bottleand suction line ordered with the sampler. Formore information on factory settings, refer to RunDiagnostics on page 41, and Tables 7 and 8.

    Figure 8 Interactive State Structure

    [PROGRAM, CONFIGURE]

    SAMPLERConfigure

    . . . STANDBY . . .

    9:54:40 11-JUN-91

    . . . STANDBY . . .

    9:50:34 11-JUN-91

    Program

    PROGRAM SEQUENCE CONFIGURE SEQUENCE

    Set Clock

    Bottle Size

    Suction Line

    Liquid Detector

    Programming Mode

    * Load Stored Program

    * Save Stored Program

    * Flow Mode Sampling

    * Nonuniform Time

    Calibrate Sampler

    * Sampling Stop/Resume

    Start Time Delay

    Enable Pin

    Event Mark

    Purge Counts

    Tubing Life

    Program Lock

    Sampler ID

    Run Diagnostics

    Exit Configuration

    Sample Pacing

    Sample Volumes and Suction Head

    Key Times

    Display #1

    PROGRAMMING SEQUENCE

    COMPLETE

    * Indicates Extended Programming Mode

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    Table 4 Configure Option Functions

    Configure Option

    Availability

    Function

    Bas

    ic

    Ext

    end

    ed

    Set Clock ✔ ✔ Sets the sampler’s real time clock.

    Bottle Size ✔ ✔ Sets the sampler for portable or refrigerated configuration. Sets thesize of the composite bottle.

    Suction Line ✔ ✔ Sets the type of line (vinyl or Teflon), line diameter (1/4- or 3/8-inch), and

    line length (3 to 99 ft).

    Liquid Detector ✔ ✔Enables/disables liquid detector, sets the number of rinse cycles (0 to 3),enables/disables the suction head entry, and sets the number of sam-pling retries (0 to 3).

    Programming Mode ✔ ✔ Sets the programming mode: basic or extended.

    Load Stored Program ✔ Loads one of up to three previously saved sampling programs.

    Save Current Program ✔ Saves current sampling program.

    Flow Mode Sampling ✔ Directs sampler to take a sample at the beginning of a flow-paced pro-gram.

    Nonuniform Time ✔ Directs sampler to accept nonuniform intervals as specific clock timesor in minutes.

    Calibrate Sampler ✔ ✔ Enables/disables the calibration sequence.

    Sampling Stop/Resume ✔ Enables/disables Sampling Stops and Resumes feature.

    Start Time Delay ✔ ✔

    Sets the start time delay (from 0 to 9999 minutes). If no specific starttime is entered in the program sequence, the program will use theentered start time delay. The delay is the amount of time which willelapse after the START SAMPLING key is pressed or after the sampler isenabled.

    Enable Pin ✔ ✔

    Enables/disables the master/slave sampling. Directs the sampler totake a sample when disabled and/or enabled by an Isco Flow Meter orLiquid Level Actuator. Allows you to restart the sampling intervalwhen the sampler is enabled.

    Event Mark ✔ ✔ Allows you to select one of four types of event marks.

    Purge Counts ✔ ✔ Adjusts the number of pre-sample and post-sample purge counts.

    Tubing Life ✔ ✔ Displays the pump tubing life information. Resets the tubing life count.

    Program Lock ✔ ✔ Enables/disables the password protection for input displays.

    Sampler ID ✔ ✔ Allows you to enter a 10 character ID number for the sampler.

    Run Diagnostics ✔ ✔ Tests the RAM, ROM, and pump. Allows for re-initialization of certainprogram and configure settings.

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    INTRODUCTION TO THEPROGRAMMING PROCEDURE

    The procedure used to program the sampler followsthe steps listed below. Note: Because the configura-tion settings determine portions of the programsequence and affect the accuracy of the sample, checkthe configuration settings before programming.

    1. Determine the equipment you will be using withthe sampler. You will need to know the capacityof the bottle, and the inside diameter, type(vinyl or Teflon), and length of the suction line.You will need this information when you verifyand revise the configuration settings in step 2.

    2. Check the configuration settings. From standby,access the interactive state. Select the configuresequence. Check the configuration settings,revising any settings as needed; select basic orextended programming mode. Return to thestandby state.

    Example 1 shows you how to check and revisethe configuration settings in the configuresequence. (We recommend you review KeypadDescription on page 19 and Displays on page 20before you work through the programmingexamples. These sections discuss the functionsof the individual keys and how to use the keyswhen programming the sampler.)

    3. Program the sampler. Again, from standby,access the interactive state. Select the programsequence. Enter the program settings for yourroutine. The sampler will prompt you throughthe programming process. When the process iscompleted, the sampler will automaticallyreturn to standby.

    A more detailed discussion of the programmingprocedure is on page 23. Examples 2 through 4demonstrate several types of sampling pro-grams in the basic mode. Extended mode sam-pling programs can be found in Examples 7through 10.

    4. If desired, connect the sampler to a flow meteror other interfacing equipment. Start the sam-pler. As the routine is executed, the displays willreport the sampler’s progress. The program-ming examples in this manual conclude withthe run state displays you should see for eachsampling routine. When the routine is done, thesampler will return to standby.

    5. Retrieve the filled sample bottle. If desired, usethe Display Status procedure discussed on page 57to examine the sampler’s log of sampling results.

    6. If you need to reprogram the sampler, followthis procedure from the beginning. If the sam-pler’s current program is correct, start the sam-pling routine again.

    USING THE KEYPAD TORESPOND TO DISPLAYS

    Configuring and programming the sampler is assimple as responding to displays on the LCD withthe keypad. The sampler will prompt you throughmany of the entries by presenting a question or achoice on the display. You must respond with thekeypad. The LCD and the keypad are located on thesampler control panel, shown in Figure 9.

    A summary of each key’s function can be found onpage 19. For a discussion of the displays presentedon the LCD and the way you can use the keypad tointeract with the sampler, see page 20.

    KEYPAD DESCRIPTION Keys are grouped together on the control panel toassist you in identifying related functions. Controlkeys are used to manually control the sampler;numeric keys are used to enter program values;programming keys are used to monitor the sam-pler’s status and direct programming activities. Inthis manual, individual keys are indicated inSMALL CAPITAL LETTERS.

    The individual key switches that make up the key-pad provide tactile and audible feedback to assureyou that the key switch has been successfully actu-ated. When a key switch is pressed, you can feelthe deflection of the spring member in the switch;an audio indicator inside the sampler will beeponce. The sampler has a 10-keystroke bufferwhich, in some cases, allows you to “type ahead” ofthe display.

    Control Keys

    Control keys allow you to turn the sampler on oroff, start or resume the currently entered program,and control the sampler manually. The functions ofthe control keys are listed below

    ON/OFF - Pressing the ON/OFF key when the sam-pler is off will turn the sampler on, reactivate thedisplay, and place the sampler in the standbystate. Pressing the ON/OFF key (when the sampleris on) will halt all sampling activity and will clearthe display.

    PUMP FORWARD - While in the standby state,pressing the PUMP FORWARD key will cause thepump to run continuously in the forward direction.The pump will run until the STOP key is pressed.

    PUMP REVERSE - While in the standby state,pressing the PUMP REVERSE key will run the pumpcontinuously in reverse. The pump will run untilthe STOP key is pressed.

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    STOP - The STOP key will stop the pump any timeit is running. When the STOP key is pressed in therun state, the sampling routine will be halted, thesampler will be transferred to the standby state,and the “PROGRAM HALTED” message will be dis-played. Pressing the STOP key while in the interac-tive state will access the display’s reference number.

    START SAMPLING - When in the standby state,pressing the START SAMPLING key will begin thesampling program. When entering a sampler ID,the key will type a space.

    RESUME SAMPLING - When “PROGRAMHALTED” is displayed, pressing the RESUME SAM-PLING key will cause the sampler to continue withthe current sample program at the point at whichit was halted. When entering a sampler ID, the keywill type a period.

    MANUAL SAMPLE - Pressing the MANUAL SAM-PLE key will allow you to take a manual sample.The MANUAL SAMPLE key is valid in the standbystate, the run state, and when calibrating the sam-pler. When entering a sampler ID, the key willtype a dash (-).

    Program Keys

    The four program keys are used to enter programsettings. Each key’s function is listed below.

    DISPLAY STATUS - While the sampler is in thestandby or run state, pressing the DISPLAY STATUSkey will allow you to view the program settings orthe sampling results.

    EXIT PROGRAM - Pressing the EXIT PROGRAMkey while in the program sequence will return thesampler to standby. Pressing the EXIT PROGRAM keywhile in the run state will halt the program; themessage “PROGRAM HALTED” will be displayed.

    CLEAR ENTRY - When entering a number, theCLEAR ENTRY key can be used to return to the orig-inal entry.

    ENTER/PROGRAM - Pressing the ENTER/PRO-GRAM key, while in the standby state, will cause thesampler to enter the interactive state. While at aninput display, pressing the ENTER/PROGRAM key willaccept an entered value or a blinking option anddirect the sampler to proceed to the next step. Inputdisplays are discussed on page 20.

    Numeric Keys

    The numeric keys consist of 10 digit keys, a LEFTARROW key, and a RIGHT ARROW key. The digit keysare used to enter quantities. The arrow keys areused to move through the configure option list orprogram options.

    LEFT ARROW - The LEFT ARROW key is used toselect one of two or more program options dis-played when the sampler is in the interactivestate. When more than one numeric entry is dis-played – for example, the hours and minutes of atime setting – the LEFT ARROW can be used to stepback to a previously entered value. When enteringa number, the LEFT ARROW can be used to erase themost recently entered digit. It is also used to stepthrough display status information and configureoption list.

    RIGHT ARROW - The RIGHT ARROW key is usedto select one of two or more program options dis-played in an input display. It is also used to stepthrough display status information and configureoption list.

    DISPLAYSThere are two types of displays: displays which com-municate information about the sampler’s statusand displays which request input. In many cases,you must respond to a display with the keypad.

    Informational Displays

    Informational displays communicate informationabout the sampler’s status. For example, when thesampler completes a sampling program, a displaysimilar to the illustration below appears. It com-municates the sampler’s status (“DONE”), thenumber of samples taken (which will vary accord-ing to the program), and the current time and date.

    Input Displays

    Input displays can be identified easily becausethey contain a blinking word or number. The blink-ing word or number serves as a prompt for inputand is said to be “selected.” When the input dis-plays shown below first appear, the word “PRO-GRAM” (display a) and the sample volume entry“250” (display b) will be blinking. Blinking wordsor numbers are represented in illustrations of dis-plays with Italic characters.

    DONE . . . 48 SAMPLES10:32:34 14-JUN-91

    [PROGRAM, CONFIGURE]SAMPLER

    a

    SAMPLES VOLUMES OF250 ml EACH (10 - 990)

    b

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    Figure 9 3710R/3710VR Sampler Control Panel

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    Display Numbers

    Nearly all input displays have a number assignedto them. The number is used to cross reference theinput displays with a explanatory listing found inAppendix A - Display Index or in the 3710R/3710VR/3710FR Refrigerated Sampler PocketGuide. If you have a question about a given inputdisplay, you can easily locate the description of thedisplay.

    The display number can be accessed by pressingthe STOP key when viewing the input display. Tosee the display number, press the STOP key, readthe number from the display, then look up the cor-responding number in Display Index on page 95 forinformation on that display. The display numberfor display a (above) is “1.”

    Displays with Choices

    There are two types of input displays: displayswhich prompt you to make a choice (between time-paced and flow-paced sampling, for example) anddisplays which prompt for numeric input (samplevolume, for example). In displays which promptyou to make a choice, you must select one of up tofour alternatives placed in brackets. Display a(above) prompts you to select the program or theconfigure sequence. The choices, “PROGRAM” and“CONFIGURE,” are placed in brackets.

    When an input display prompting for a choice firstappears, the blinking word indicates the currentlyselected choice. If the blinking word is acceptable,press the ENTER/PROGRAM key. If the blinking wordis not acceptable, select the preferred choice bypressing the LEFT ARROW or RIGHT ARROW key untilthe preferred choice is blinking; then press theENTER/PROGRAM key. The sampler will store theselected choice and advance to the next step.

    When the display illustrated in a appears, theword “PROGRAM” will be blinking. If “PRO-GRAM” is acceptable, press the ENTER/PROGRAMkey. If “PROGRAM” is not acceptable, press theLEFT ARROW or RIGHT ARROW key until “CONFIG-URE” is blinking. Then, press the ENTER/PROGRAMkey. The ENTER/PROGRAM key directs the samplerto advance to the next step.

    Numeric Input Displays

    A numeric input display will prompt for input byblinking the currently stored number. (In the dis-play illustrated in b, the number “250” will blink toprompt you to enter a value.) If the blinking num-ber is acceptable, it is not necessary to type thenumber again: pressing the ENTER/PROGRAM keywill store the number and advance the program to

    the next step. To enter a new number, press theappropriate numeric keys, then press the ENTER/PROGRAM key.

    The sampler will not accept a number that exceedsthe allowable range of values placed in parenthe-ses on the display. In illustration b, no less than 10ml and no more than 990 ml can be entered as asample volume. If an entered number exceeds therange, the sampler will emit a series of beeps andthe original number will reappear. An acceptablevalue must be entered to advance to the next step.

    Editing Numbers

    The left arrow key and clear entry key can be usedto edit numeric entries if they are used after youpress a numeric key and before you press theenter/program key. The clear entry key will clearany typed number and the original number will re-appear. The LEFT ARROW will erase the mostrecently typed number.

    Some numeric input displays prompt for morethan one value. In the ill