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Transmitters for HazardousAreas

Series HMT360

USER'S GUIDEM010056EN-E

August 2005

PUBLISHED BY

Vaisala Oyj Phone (int.): +358 9 8949 1P.O. Box 26 Fax: +358 9 8949 2227FIN-00421 HelsinkiFinland

Visit our Internet pages at http://www.vaisala.com/

© Vaisala 2005

No part of this manual may be reproduced in any form or by any means,electronic or mechanical (including photocopying), nor may its contents becommunicated to a third party without prior written permission of the copyrightholder.

The contents are subject to change without prior notice.

Please observe that this manual does not create any legally binding obligations forVaisala towards the customer or end user. All legally binding commitments andagreements are included exclusively in the applicable supply contract orConditions of Sale.

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Table of Contents

CHAPTER 1GENERAL INFORMATION............................................................................ 7

About This Manual ................................................................... 7Version Information ............................................................... 7Related Manuals ................................................................... 7General Safety Considerations ............................................. 8Feedback............................................................................... 8

Product Related Safety Precautions ...................................... 9ESD Protection ......................................................................... 9Recycling ................................................................................ 10Regulatory Compliances ....................................................... 10

European requirements....................................................... 10US requirements (FM)......................................................... 10Canadian requirements (CSA)............................................ 11Australian requirements (TestSafe) .................................... 11

Trademarks ............................................................................. 11License Agreement ................................................................ 11Warranty.................................................................................. 11

CHAPTER 2PRODUCT OVERVIEW................................................................................ 13

Output Quantities ................................................................ 14Probe Options ..................................................................... 14Maintenance........................................................................ 15

CHAPTER 3INSTALLATION............................................................................................ 17

General Instructions .............................................................. 17Mounting Probe Cable in Gas Group IIC Spaces ............... 17Selecting Location............................................................... 18Temperature Differences .................................................... 18Checking Temperature Reading ......................................... 18Mounting of Transmitter ...................................................... 19

Mounting the Probes.............................................................. 20HMP362 - Small Pressure-Tight Probe............................... 21HMP363 Probe for Confined Spaces.................................. 23HMP365 Probe for High Temperatures .............................. 24HMP364 for Pressurized Spaces........................................ 24HMP368 Probe For Measuring Humidity in PressurizedPipelines or Moisture in Liquids .......................................... 27

Tightening Clasp Nut ..................................................... 29Installing Sensor Head Through Ball Valve Assembly........ 30

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CHAPTER 4ELECTRICAL CONNECTIONS....................................................................33

Installation in Hazardous Locations.....................................34US and Canadian Requirements.........................................34European Requirements .....................................................34

CATEGORY 1 (Zone 0)..................................................34CATEGORY 2 or 3 (Zone 1 or 2) ...................................34Maximum Cable Resistance Calculation for the Barrier(Vaisala Code: 210664)..................................................35

HMT360 Connected to Galvanic Isolator ............................36HMT360 Connected to Zener Barrier ..................................37Examples of Connections....................................................38Grounding............................................................................39

CHAPTER 5OPERATION.................................................................................................41

HMT360 with Display..............................................................41HMT360 for Natural Gas .....................................................41

HMT360 without Display ........................................................42DIP Switch Functions.............................................................42

CHAPTER 6OPERATION ERRORS ................................................................................45

Cleaning Sensor from Glycol in Natural Gas Application..45

CHAPTER 7DISPLAY/KEYPAD COMMANDS................................................................47

Setting Pressure for Calculations.........................................47Selecting Output Quantities ..................................................48

HMT360 for Natural Gas .....................................................48Upper Half of Display ..........................................................48Lower Half of Display ..........................................................48

Selecting Analog Outputs......................................................49Scaling Analog Outputs.........................................................50

CHAPTER 8SERIAL INTERFACE ...................................................................................53

Serial Communication Settings ............................................54ASEL Selecting Analog Outputs...........................................54S Scaling Analog Outputs .....................................................55Adjustment Commands .........................................................56

CRH Relative Humidity Adjustment.....................................56CT Temperature Adjustment ...............................................56ACAL Analog Output Calibration.........................................57

Output Commands .................................................................57ITEST Testing Analog Outputs............................................57SEND Outputting Measurement Values..............................58R Activating Continuous Output ..........................................58S Stopping Continuous Output............................................58

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INTV Setting Output Interval ............................................... 58PRES Setting Ambient Pressure for Calculations .............. 59

CHAPTER 9MEASURING AT OVERPRESSURE........................................................... 61

Pressure Regulator Recommended ..................................... 61

CHAPTER 10CALIBRATION AND ADJUSTMENT........................................................... 63

Calibration Interval................................................................. 63Factory Calibration and Adjustment .................................... 63User Calibration and Adjustment ......................................... 63

Removing Electronics Unit for Calibration .......................... 64Connections ........................................................................ 65

Calculating Correspondence of Current Values and OutputQuantities................................................................................ 66Relative Humidity Calibration ............................................... 67

Automatic Two-Point Calibration (Only with HMT360 withDisplay) ............................................................................... 67Manual Calibration .............................................................. 69

Low End Adjustment ...................................................... 69High End Adjustment (Two-Point Calibration) ............... 70

Temperature Calibration in One Point ................................ 71

CHAPTER 11SPECIFICATIONS........................................................................................ 73

Performance ........................................................................... 73Relative Humidity ................................................................ 73Moisture in Natural Gas (HMT362N/364N/368N) ............... 74

Dewpoint Measurement ................................................. 74Calculated Variables Available (Typical Ranges) ............... 74Water Activity in Jet Fuel Applications ................................ 75Temperature........................................................................ 75Calculated Variables (Typical Ranges)............................... 76

With HMP361 Probe ...................................................... 76With HMP363, HMP364, HMP365 & HMP368 Probes.. 76

Outputs.................................................................................... 76Classification with Current Outputs..................................... 77General .................................................................................... 78Probes ..................................................................................... 79Options and Accessories ...................................................... 80Accuracy of Calculated Variables (Not Valid with HMT360for Natural Gas) ...................................................................... 81

Accuracy of Dewpoint Temperature °C ......................... 81Accuracy of Mixing Ratio g/kg........................................ 81Accuracy of Wet Bulb Temperature °C.......................... 82Accuracy of Absolute Humidity g/m³ .............................. 82

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APPENDIX ADIMENSIONS ...............................................................................................83

HMP361....................................................................................83HMP362....................................................................................84HMP363....................................................................................85HMP364....................................................................................85HMP365....................................................................................85HMP368....................................................................................86Mounting Plate........................................................................86Rain Shield ..............................................................................87Protection Cover.....................................................................88

APPENDIX BWIRING FOR INTRINSICALLY SAFE OPERATION, FM ...........................89

APPENDIX CWIRING FOR INTRINSICALLY SAFE OPERATION, CSA.........................91

APPENDIX DCERTIFICATES ............................................................................................93

List of FiguresFigure 1 Transmitter for Hazardous Areas Series HMT360 ...................13Figure 2 HMT360 Probe Options............................................................14Figure 3 Mounting the Transmitter and Detaching the Probe ................19Figure 4 Different Parts of the Transmitter .............................................20Figure 5 HMP362 Installation (without Sampling Cell) ...........................21Figure 6 HMP302SC (Optional Sampling Cell) ......................................22Figure 7 Installation of Sensor Head HMP363 in Channel with Flange

and Supporting Bar...................................................................23Figure 8 Mounting HMP365 Sensor Head in Duct or Channel...............24Figure 9 Mounting the HMP364 Probe ...................................................25Figure 10 Marking Nut and Fitting Screw .................................................26Figure 11 Cleaning Tightening Cone ........................................................26Figure 12 HMP368 Probe Dimension: Standard 178 mm and Optional 400

mm............................................................................................28Figure 13 Tightening Clasp Nut ................................................................29Figure 14 Installing Sensor Head Through DMP248BVS Ball Valve

Assembly ..................................................................................30Figure 15 HMT360 Connected to Galvanic Isolator .................................36Figure 16 HMT360 Connected to Zener Barrier .......................................37Figure 17 STAHL 9160/13-11-11 (Galvanic Isolator) ...............................38Figure 18 STAHL 9001/51-280-091-141 (Zener Barrier)..........................38Figure 19 Grounding .................................................................................39Figure 20 DIP Switch Functions ...............................................................42Figure 21 Cleaning Sensor .......................................................................46Figure 22 Detaching Electronics Unit with Probe for Calibration..............64Figure 23 Connecting Power Supply and Multimeter for Calibration........65

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Figure 24 Display Chart of the Automatic Calibration Procedure............. 68Figure 25 Effect of Process Temperature on Dewpoint Measurement

Accuracy................................................................................... 74

List of TablesTable 1 Manual Revisions ....................................................................... 7Table 2 Related Manuals ........................................................................ 7Table 3 Available Quantities.................................................................. 49Table 4 Serial Communications Settings .............................................. 54Table 5 Output Quantities and Their Abbreviations .............................. 55Table 6 Pressure Conversion Chart ...................................................... 60Table 7 Relative Humidity Specifications .............................................. 73Table 8 Dewpoint Measurement Specifications .................................... 74Table 9 Calculated Variables Specifications ......................................... 74Table 10 Water Activity in Jet Fuel Applications Specifications.............. 75Table 11 Temperature Specifications ..................................................... 75Table 12 HMP361 Calculated Variables Specifications.......................... 76Table 13 HMP363, HMP364, HMP365 & HMP368 Probes Calculated

Variables Specifications ........................................................... 76Table 14 Output Specifications ............................................................... 76Table 15 General Specifications ............................................................. 78Table 16 Probe Specifications................................................................. 79Table 17 Options and Accessories Table ............................................... 80Table 18 Accuracy of Dewpoint Temperature °C.................................... 81Table 19 Accuracy of Mixing Rratio g/kg................................................. 81Table 20 Accuracy of Wet Bulb Temperature °C .................................... 82Table 21 Accuracy of Absolute Humidity g/m³ ........................................ 82

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Chapter 1 ________________________________________________________ General Information

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CHAPTER 1

GENERAL INFORMATION

This chapter provides general notes for the product.

About This ManualThis manual provides information for installing, operating, andmaintaining Transmitters for Hazardous Areas Series HMT360.

Version InformationTable 1 Manual RevisionsManual Code DescriptionU336en-1.1 1st version, March 1999M010056en-A 2nd version, January 2001M010056en-B 3rd version, March 2002M010056en-C 4th version, November 2002M010056EN-D 5th version, May 2004M010056EN-E 6th version, July 2005

Related ManualsTable 2 Related ManualsManual Code Manual NameM210185en-B Humidity Calibrator HMK15 User's Guide

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General Safety ConsiderationsThroughout the manual, important safety considerations arehighlighted as follows:

WARNING Warning alerts you to a serious hazard. If you do not read and followinstructions very carefully at this point, there is a risk of injury oreven death.

CAUTION Caution warns you of a potential hazard. If you do not read andfollow instructions carefully at this point, the product could bedamaged or important data could be lost.

NOTE Note highlights important information on using the product.

FeedbackVaisala Customer Documentation Team welcomes your commentsand suggestions on the quality and usefulness of this publication. Ifyou find errors or have other suggestions for improvement, pleaseindicate the chapter, section, and page number. You can sendcomments to us by e-mail: [email protected]


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Product Related Safety PrecautionsThe Transmitter for Hazardous Areas Series HMT360 delivered toyou has been tested for safety and approved as shipped from thefactory. Note the following precautions:

WARNING Ground the product, and verify outdoor installation groundingperiodically to minimize shock hazard.

CAUTION Do not modify the unit. Improper modification can damage theproduct or lead to malfunction.

ESD ProtectionElectrostatic Discharge (ESD) can cause immediate or latent damageto electronic circuits. Vaisala products are adequately protectedagainst ESD for their intended use. However, it is possible to damagethe product by delivering electrostatic discharges when touching,removing, or inserting any objects inside the equipment housing.

To make sure you are not delivering high static voltages yourself:

- Handle ESD sensitive components on a properly grounded andprotected ESD workbench. When this is not possible, groundyourself to the equipment chassis before touching the boards.Ground yourself with a wrist strap and a resistive connection cord.When neither of the above is possible, touch a conductive part ofthe equipment chassis with your other hand before touching theboards.

- Always hold the boards by the edges and avoid touching thecomponent contacts.

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RecyclingRecycle all applicable material.

Dispose of batteries and the unit according to statutory regulations.Do not dispose of with regular household refuse.

Regulatory Compliances

European requirementsEU directive 94/9/EC (ATEX 100a).

Standards EN 50014 and EN 50020.

Standard EN 50284 for apparatus of equipment group II, category 1 G(intended for hazardous locations).

Marking EEx ia IIC T4: at temperature range -20 ... +60 °C andpressure range 0.8 ... 1.1 bar.

US requirements (FM)FM approved for Classes I, II & III, Division 1, Groups A, B, C, D, E,F & G and Division 2, Groups A, B, C, D, F and G. Intrinsically safewhen connected as shown in Appendix B.


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Canadian requirements (CSA)CSA approved for Class I, Division 1 and 2, Groups A, B, C, D; ClassII Division 1 and 2, Groups G and Coal Dust; Class III. Intrinsicallysafe when connected as shown in Appendix C.

Australian requirements (TestSafe)TestSafe approved for Ex ia IIC T5 IP65 (Zone 0).

TrademarksHUMICAP® is a registered trademark of Vaisala.

License AgreementAll rights to any software are held by Vaisala or third parties. Thecustomer is allowed to use the software only to the extent that isprovided by the applicable supply contract or Software LicenseAgreement.

WarrantyFor certain products Vaisala normally gives a limited one-yearwarranty. Please observe that any such warranty may not be valid incase of damage due to normal wear and tear, exceptional operatingconditions, negligent handling or installation, or unauthorizedmodifications. Please see the applicable supply contract or Conditionsof Sale for details of the warranty for each product.

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Chapter 2 __________________________________________________________ Product Overview

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CHAPTER 2

PRODUCT OVERVIEW

The series HMT360 transmitters are microprocessor based two-wiretransmitters for measuring relative humidity and temperature inhazardous areas.

NOTE Connect the transmitter always via galvanic isolators or Zenerbarriers in hazardous environments.

Figure 1 Transmitter for Hazardous Areas Series HMT360

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Output QuantitiesThe transmitter has a local display and two output current channels.The available quantities are described in Table 3 on page 49.

Probe OptionsThe HMT360 transmitter series has various options for transmitterunits, sensor heads and cable lengths (2, 5 and 10 m). The availableprobe types are presented in Figure 2.

0505-265

Figure 2 HMT360 Probe Options

The following numbers refer to Figure 2 above:

1 = HMP361 probe for wall mounting2 = HMP362 probe for pressurized spaces up to 167 bars3 = HMP363 probe head (Ø 13.5 mm) for tight spaces4 = HMP364 probe for pressurized spaces up to 100 bars5 = HMP365 probe for high temperatures up to 180°C6 = HMP368 probe for installations in pressurized pipelines up to

40 bars; pressure-tight sliding clasp nut

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MaintenanceThe electronics unit of the transmitter can be removed and replaced inthe field, as well as the probe; see section Removing Electronics Unitfor Calibration on page 64 for detailed information.

All other maintenance is performed at the factory. If a transmitter isdamaged, contact Vaisala or Vaisala distributor and send theinstrument to the addresses below:

Please, include a short description of the fault, and the date and placeof purchase.

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Chapter 3 _______________________________________________________________ Installation

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CHAPTER 3

INSTALLATION

General Instructions

NOTE Mounting Probe Cable in GasGroup IIC SpacesThe following applies only to installation within the EU!

The following instructions shall be followed to fulfil thespecifications of the EN 50284 for non conductive layer of the probecable:

- Never mount or handle the probe cable when hazardous gases arepresent.

- For achieving a conductive shield, cover the probe cable withconductive material like metal or conductive tape or mount theprobe cable in a metal conduit.

- Assure that the conductive shield fulfils requirements of thestandard EN50284 (resistance less than 1 GΩ) and make sure that itcan not come loose in any operation situation.

NOTE During the installation work of the sensor heads in gas group IICareas (requiring category I devices), it has to be guaranteed that evenin fault cases sparks generated by impacts or friction on the surface ofthe housing can never occur.

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Selecting LocationSelect a place with stable conditions for mounting the transmitter. Donot expose the transmitter to direct sunlight or rain. A rain shield forHMT360 transmitter is available. When mounting the sensor head,select a place representing the process conditions.

Temperature DifferencesIf there is a difference between the process and ambient temperatures,it is recommended to mount the sensor head and at least one meter ofcable inside the process. This is to avoid incorrect relative humidityreadings due to temperature difference. If this installation is notpossible and the sensor head must be installed through the wall (forexample, with a flange), the sensor head and the cable must beinsulated carefully.

Checking Temperature ReadingThe actual temperature of the process can be measured with areference instrument to be compared with the transmitter reading. Theheat transfer is less evident if you remove the protective filter of thesensor for a short-term test. However, never use the sensor longperiods without the filter as this may cause a faster contamination ofthe sensor. The transmitter fulfils the specified EMC regulations withthe protective filter on the sensor head.


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Mounting of Transmitter

0505-266

Figure 3 Mounting the Transmitter and Detaching the Probe

1. Attach the mounting plate to the wall with 4 screws.

2. Press down the transmitter so that it slides along the rails of themounting plate.

3. Fasten the transmitter to the mounting plate with the Allenscrew1).

4. The probe can be detached and replaced when needed by simplyunfastening the two Allen screws.

1) 3 mm Allen key provided

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0505-267

Figure 4 Different Parts of the Transmitter


1 = Electronics unit2 = Transmitter base3 = Probe; including a part of measurement electronics (for

example, calibration memory and the sensor head)4 = Protective covers5 = Flat cable6 = Sensor head7 = Cable glands8 = Grounding terminals9 = RS232 connector

Mounting the Probes

NOTE - Do not unsolder and then again resolder the sensor head cable fromand to the printed board during installation.

- Do not shorten or lengthen the probe cable

These procedures may alter the humidity calibration of thetransmitter.


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HMP362 - Small Pressure-TightProbeThe HMP362 probe is a small pressure-tight probe equipped withinstallation flange. It is suitable for dewpoint measurements in naturalgas. When sampling in pressurized processes, the sampling cellHMP302SC is available as an optional accessory.

0505-268

Figure 5 HMP362 Installation (without Sampling Cell)

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1

2

3

4

5

6

0505-269

Figure 6 HMP302SC (Optional Sampling Cell)


1 = Gas in2 = Probe3 = Gas out4 = Probe5 = Sampling cell6 = Clamp (not needed if sampling cell is suspended on the

piping)

CAUTION In pressurized processes it is essential to tighten the supporting nutsand screws very carefully to prevent loosening of the probe by theaction of pressure.

NOTE If the HMP362 is installed in a process with a pressure differing fromnormal atmospheric pressure, please enter the pressure value of theprocess (in hPa or mbar) into the transmitter memory via the serialline (see page 59) or via the display/keypad (see page 47).


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HMP363 Probe for Confined SpacesThe HMP363 is a small size general-purpose probe suitable forinstallation in ducts and channels with the installation kit available.The installation kit includes a flange, a supporting bar for the sensorhead cable and screws for attaching the flange to the duct wall. Thedistance between the sensor and the channel wall can be adjusted. Theadjustment range is 100 - 320 mm, measured from the tip of the sensorhead to the flange.

12

3

4

56

Ø13.5

70

0505-270

Figure 7 Installation of Sensor Head HMP363 in Channelwith Flange and Supporting Bar


1 = Duct wall2 = Plugged hole for reference measurements is recommended3 = Flange4 = Seal5 = Supporting bar6 = Sensor head

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HMP365 Probe for HighTemperaturesWhen installing the HMP365 sensor head in a duct or channel, thereshould not be significant difference between temperatures inside andoutside of the duct. This can cause incorrect humidity readings.

0505-271

Figure 8 Mounting HMP365 Sensor Head in Duct or Channel


1 = A plugged hole for reference measurements2 = Sensor head3 = Mounting flange

HMP364 for Pressurized SpacesThe HMP364 pressure-tight probe is designed for the humiditymeasurements in pressurized rooms and industrial processes. Thisprobe is also available for dewpoint measurements in natural gas. Theprobe is provided with a nut, a fitting screw and a sealing washer tomake the installation easier.

CAUTION In pressurized processed it is essential to tighten the supporting nutsand screws very carefully to prevent loosening of the probe by theaction of pressure.


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1. Unscrew the fitting screw from the nut and the sensor head.

2. Fasten the fitting screw to the chamber wall with a sealingwasher. Tighten the fitting screw into the threaded sleeve with atorque spanner. The tightening torque is 150 ± 10 Nm (110 ± 7ft-lbs)

3. Insert the body of the sensor head into the fitting screw andscrew the nut manually to the fitting screw until the connectionfeels tight.

4. Mark both the fitting screw and the nut hex (see Figure 10).

5. Tighten the nut a further 30° (1/12 turn) or if you have a torquespanner tighten it with a torque of 80 ± 10 Nm (60 ± 7 ft-lbs).

NOTE After detachment the nut must be tightened without increased effort.

6. Clean and grease the tightening cone of the fitting screw afterevery tenth detachment. Change the sealing washer every timethe fitting screw is detached. Use high-vacuum grease (forexample; Down Corning, Europe) or a similar grease.

0505-272

Figure 9 Mounting the HMP364 Probe


1 = Tightening cone2 = Nut3 = Fitting screw4 = Sealing washer5 = Sensor head; Ø 13.5 mm

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0505-273

Figure 10 Marking Nut and Fitting Screw

0505-274

Figure 11 Cleaning Tightening Cone


1 = Fitting screw2 = Sealing washer3 = Tightening cone4 = Clean cotton stick

NOTE If the HMP364 is installed in a process with a pressure differing fromnormal atmospheric pressure, please enter the pressure value of theprocess (in hPa or mbar) into the transmitter memory via the serialline (see page 59) or via the display/keypad (see page 47) .


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HMP368 Probe For MeasuringHumidity in Pressurized Pipelinesor Moisture in LiquidsThe HMP368 probe is available with two lengths, standard 178 mmand optional 400 mm. The probe is provided with a sliding fit whichenables different installation depths and makes the installation andremoval easier in pressurized processes. The probe is speciallydesigned for the measurements in pipelines. This probe is alsoavailable for dewpoint measurements in natural gas.

When the probe is used in a pressurized pipeline or in liquids (forexample, feeder routes) the sensor head should preferably be installeddirectly in the process through a ball valve assembly, see page 30.

CAUTION In pressurized processed it is essential to tighten the supporting nutsand screws very carefully to prevent loosening of the probe by theaction of pressure.

NOTE - When the HMP368 is installed in a process with a pressurediffering from normal atmospheric pressure, please enter thepressure value of the process (in hPa or mbar) into the transmittermemory via the serial line (see page 59) or via the display/keypad(see page 47).

- Make sure that the temperature at the measurement point is equalto that of the process, otherwise the humidity reading may beincorrect.

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0505-275

Figure 12 HMP368 Probe Dimension: Standard 178 mm andOptional 400 mm


1 = Clasp nut, 24 mm hex head2 = Fitting screw, 27 mm hex headA = Probe 178 mm; adjustment range 120 mm

Probe 400 mm; adjustment range 340 mm

CAUTION Take care not to damage the probe body. A damaged body makes theprobe head less tight and may prevent it from going through the claspnut.


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Tightening Clasp Nut

1. Adjust the probe to a suitable depth according to the type ofinstallation.

2. Tighten the clasp nut first manually.

3. Mark the fitting screw and the clasp nut.

4. Tighten the nut a further 50 - 60° (ca.1/6" turn) with a forkspanner. If you have a suitable torque spanner, tighten the nut to45 ± 5 Nm (33 ± 4 ft-lbs).

0505-276

Figure 13 Tightening Clasp Nut


1 = Probe2 = Clasp nut3 = Pen4 = Fitting screw

NOTE Take care not to tighten the clasp nut more than 60° to avoiddifficulties when opening it.

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Installing Sensor Head ThroughBall Valve AssemblyThe best way for installing the sensor head to pressurized process orpipeline is to install it through the ball valve assembly. Thisinstallation makes it unnecessary to empty or shut down the processfor installing or removing the sensor head. Use the VaisalaDMP248BVS ball valve set or a 1/2" ball valve assembly with a ballhole of Ø14 mm or more. If you install the sensor head (Ø 13.5 mm)in a process pipe, please note that the nominal size of the pipe must beat least 1 inch (2.54 cm). The manual press tool can be used to pressthe sensor head into the pressurized (< 10 bar) process or pipeline.

0505-277

Figure 14 Installing Sensor Head Through DMP248BVS BallValve Assembly


1 = Manual press tool2 = Handle of the ball valve3 = Sensor head4 = Process chamber/pipeline5 = Groove on the probe indicating the upper adjustment limit6 = Filter7 = Ball of the ball valve


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Install the sensor head transversely against the direction of the processflow.

NOTE Installation or removing the probe through a ball valve assembly ispossible without shutting the process when the pressure is less than10 bar. With 10 ... 40 bar pressures you must shut down the processbefore installing or removing the probe. The maximum operationpressure for the probe HMP368 is 40 bar.

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Chapter 4 ______________________________________________________ Electrical Connections

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CHAPTER 4

ELECTRICAL CONNECTIONS

Refer to local requirements regarding cabling, grounding and galvanicisolator or barrier connections.

NOTE Connect the transmitter always via galvanic isolators or Zenerbarriers in hazardous environments.

WARNING Be sure that the main power switch of the transmitter is set off beforemaking any electrical installations in hazardous areas.

1. Open the transmitter cover and remove the protective cover ofthe transmitter base.

2. Thread the power supply wires through the cable gland (Figure4, item 7).

3. Connect the unpowered power supply wires to the connectors:CH1 (humidity) and CH2 (temperature). Both channels requirean own power supply.

NOTE As CH1 is a main output, the transmitter does not operate if only CH2is connected (CH2 is optoisolated from transmitter electronics).

4. Replace the protective cover. Turn the transmitter on ON withthe ON/OFF switch (Figure 22, item 2).

5. Close the cover. The transmitter is ready for use.

When using the transmitter in hazardous places, the use of galvanicisolators or barriers is essential. The following barrier & isolator are

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available in Vaisala: barrier No. 210664 (STAHL 9001/51-280-091-141) and galvanic isolator No. 212483 (STAHL 9160/13-11-11).Examples of connections are presented on page 36 and moreinformation on installation in hazardous locations is given below.

Installation in Hazardous Locations

US and Canadian RequirementsUSA (FM): Wiring for intrinsically safe operation is shown inAppendix B.

Canada (CSA): Wiring for intrinsically safe operation is shown inAppendix C.

European Requirements

CATEGORY 1 (Zone 0)

The HMT360 has to be connected to Exia-certified associatedapparatus with galvanic isolation, gas group IIB or IIC.

NOTE If both analog outputs are in use, the channel 1 (-) and channel 2 (-)must be short circuited (see figure 4-3).

CATEGORY 2 or 3 (Zone 1 or 2)

The HMT360 has to be connected either to a Zener barrier or galvanicisolator

NOTE If both analog outputs are in use with a galvanic isolator, the channel1 (-) and channel 2 (-) must be short circuited (see Figure 17).

Figure 15 and Figure 16 present examples of galvanic isolators andZener barrier connections (only CH1 connected).


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Maximum Cable Resistance Calculation for theBarrier (Vaisala Code: 210664)

General specifications of the HMT360:

Supply voltage Uin = 24 V (12 ... 35 V)Maximum current Iout = 20 mA

(100 %RH)Minimum operating voltage for HMT360 Umin = 12 V (15 V with

serial port)

Stahl 9001/51-280-091-141 (values taken from the specifications):

Rated operating voltage UN = 20 ... 35 VTransmitter supply voltage US = UN - 9.5 V when UN ≤ 23.5 V

or US = 14 V when UN ≥ 23.5 VMaximum load RL ≤ 350 Ω

Calculation of the maximum cable length from barrier to transmitter:

Cable resistance (as an example) Rcable = 0.085 Ω/m/core (2 × 0.085Ω/m/pair)

If assuming that the operating voltage would be ≥ 24 V, the maximumacceptable voltage drop Udrop in cables is:

Udrop = US - Umin

Udrop = 14 V - 12 V = 2 V

We also know that:

Iout = 20 mA

and that total resistance of the cable Rcabletot is cable resistance Rcablemultiplied with the total maximum length of the cables lmax:

Rcabletot = Rcable × lmax

From these facts the following equation can be formed:

Udrop = Rcabletot × Iout

2 = 2 × 0.085 Ω/m × lmax × 20 mA

lmax = 2 V / (20 mA × 2 × 0.085 Ω/m)

lmax = 588 m = 1930 ft, maximum cable length.

NOTE If longer cable length is required use of the galvanic isolators isrecommended if possible.

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HMT360 Connected to GalvanicIsolator

HAZARDOUS AREA SAFE AREA

a) current signal controller


b) voltage signal controller0505-278, 0505-279

Figure 15 HMT360 Connected to Galvanic Isolator


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HMT360 Connected to ZenerBarrier

HAZARDOUS AREA

a) current signal controller

SAFE AREA


b) voltage signal controller0505-280, 0505-281

Figure 16 HMT360 Connected to Zener Barrier

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Examples of Connections

Make the connectionbetween the (-) terminalsalways when using agalvanic isolator !

0505-282

Figure 17 STAHL 9160/13-11-11 (Galvanic Isolator)

0505-283

Figure 18 STAHL 9001/51-280-091-141 (Zener Barrier)


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GroundingWhen grounding the transmitter, follow the local requirements. Use atleast 4 mm2 grounding cable when grounding the transmitter orbarrier. Note that the allowed resistance between barrier and systemground must be less than 1 ohm. Use ground terminal located inside oroutside of transmitter. See Figure 19 below:


0505-284

Figure 19 Grounding

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Chapter 5 ________________________________________________________________ Operation

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CHAPTER 5

OPERATION

Turn the transmitter on ON with the ON/OFF switch (Figure 22, item2).

HMT360 with DisplayMeasurement readings appear on the display after switching powerON. The analog output signals can be read from the system or loadresistor.

HMT360 for Natural GasWhen switching on the HMT360 for natural gas, the existing pressuresetting appears on the display; the default setting is 1000 hPa (=1 baror 14.5 psi).

To modify the pressure setting, turn the internal CALIBRATIONENABLED/DISABLED DIP switch of the transmitter to position ENABLED(up). Adjust the pressure reading with buttons and on thedisplay cover; the adjustment step is 100 hPa). Acknowledge the valuewith button E. To complete the pressure setting, turn the DIP switchback to position DISABLED (down). If the pressure setting is notmodified, the measurement readings appear automatically on thedisplay after 60 seconds.

NOTE Avoid static discharge. Always use a wet cloth for wiping the display.

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HMT360 without DisplayIf the transmitter does not have a display, the red LED indicator on thecover indicates various phases of calibration and possible errors. Innormal operation it is not lit. If the LED is lit and all calibration or testDIP switches are disabled, it is an indication of an internal error.

Otherwise, the LED indicates the following:

- LED blinking = calibration of the dry end (offset).

- LED lit = calibration of the wet end (gain).

NOTE If calibration is concluded but DIP switch settings are not restored,the LED indicator keeps blinking.

DIP Switch FunctionsThe table below is also printed on the protection board:

0505-285

Figure 20 DIP Switch Functions

: ANALOG OUTPUT TEST ON/OFF:

If you turn the switch to ON position (up), you can force the outputs tostates 4 mA, 12 mA and 20 mA by pressing the buttons and onthe cover.

Chapter 5 ________________________________________________________________ Operation

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: CALIBRATION DISABLED/ENABLED:

The EEPROMs are write protected. If this switch is in the DISABLEDposition (down), it does not allow any calibrations or scalings.

NOTE Keep this switch always in the disabled position during normal use ofthe transmitter.

and CALIBRATION RH, T, ANALOG:

With these combinations you can perform relative humidity,temperature or analog output calibrations with a multimeter or withthe transmitter display unit. Turn the DIP switches to the desiredposition according to the table printed on the protective cover.

OUTPUT QUANTITIES:

Determines whether the output units are metric (down) on non-metric.

, and SELECT OUTPUT QUANTITIES:

With the three DIP switches on the right, you can select the outputquantities according to the table printed on the right side of theprotective cover. Note that only the ordered quantities can be selected.The SPECIAL option gives you the choice of setting any orderedquantity to each channel.

NOTE Always restore the DIP switch settings after having tested the analogoutputs or performed the calibration.

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Chapter 6 ___________________________________________________________ Operation Errors

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CHAPTER 6

OPERATION ERRORS

The following indicates an operation error of the HMT360:

- Analog output(s) current drops below 4 mA.

- Display shows ERROR.

- LED on the cover is lit and no calibration is going on (transmitterswithout a display).

In the case of error:

- Check that the sensor is connected properly.

- Check if there is condensed water in the probe, if yes, let the probedry.

Cleaning Sensor from Glycol in Natural GasApplication

If a glycol layer on the Vaisala HUMICAP® sensor is disturbing themoisture measurement, the sensor can be cleaned on site soaking thesensor to de-ionized water or to IPA (isopropanol, propan-2-ol).

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0505-286

Figure 21 Cleaning Sensor

1. Carefully remove the sintered filter.

2. Dip the sensor in de-ionized water or IPA (max 1 minute).

3. Gently blow the sensor dry with dry gas (nitrogen) if available.

4. When the sensor and probe are dry, set the filter back on theprobe.

NOTE Do not touch the sensor surface, especially if removing the VaisalaHUMICAP® sensor from the probe.

Only dipping in de-ionized water or IPA is allowed, other agents likeethanol cannot be used.

Do not keep the sensor for more than one minute in the water or IPA.

The water or IPA temperature must be below 30 °C (86 °F).

Do not use a cotton stick or any other mechanical means for cleaningand/or drying the sensor.

In case of constant error, please contact Vaisala Service (see Chapter2, section Maintenance on page 15.

Chapter 7 __________________________________________________ Display/Keypad Commands

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CHAPTER 7

DISPLAY/KEYPAD COMMANDS

With these commands you can scale the outputs and select specialoutput quantities if the transmitter configuration allows that.

NOTE Chapter 10 Calibration and Adjustment describes separatelydisplay/keypad commands for the calibration.

Setting Pressure for CalculationsIn humidity transmitters, ambient pressure is used for the mixing ratioand wet bulb calculations. In dewpoint transmitters (natural gasapplications), the process pressure in the measurement point isrequired to achieve the specified accuracy.

To modify the pressure settings, turn the internal CALIBRATIONENABLED/DISABLED DIP switch of the transmitter to position ENABLED(up). Press button C on the display cover: text "SCAL" appears on thedisplay. Then press button E until the following display appears (thenumeric value is always the existing setting, in this example 1013.25):

0505-287

Adjust the pressure reading with buttons and . Acknowledge thevalue with button E. To complete the pressure setting, turn the dipswitch back to position DISABLED (down).

See the pressure conversion table on page 60.

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Selecting Output Quantities

HMT360 for Natural GasTwo quantities are shown on the LCD. The upper half of the displayshows the moisture, whereas the lower half is reserved for thetemperature reading.

Upper Half of DisplayTo modify the displayed quantity, turn the CALIBRATIONENABLED/DISABLED DIP switch of the transmitter to position ENABLED(up). Select the required quantity with button on the display cover,and acknowledge the value with button E. To complete the selections,turn the DIP switch back to position DISABLED (down).

When the OUTPUT QUANTITIES METRIC/NON METRIC DIP switch is inthe METRIC (down) position, the available quantities are dew/frostpoint temperature (Td °C), parts per million (ppm), and absolutehumidity in mg/m3 (W). When the DIP switch is in the NON METRIC(up) position, the available quantities are dew/frost point temperature(Td °F), parts per million (ppm), and absolute humidity in lb/mmscf(W).

Lower Half of DisplayThe OUTPUT QUANTITIES METRIC/NON METRIC DIP switch can be usedto select between °C and °F.

It is possible to check the pressure setting of the transmitter bypressing button . To return to the temperature reading, press button again.


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Selecting Analog OutputsYou can select the output quantities for channels 1 and 2 by turningthe CALIBRATION ENABLED/DISABLED DIP switch of the transmitter toposition ENABLED (up) and the three OUTPUT SELECTION DIP switchesto position SPECIAL (all up).

Press button C on the display cover: text "SCAL" appears on thedisplay. Then press button E until the following display appears:

0505-288

The characters on the second line of the display in this menucorrespond to the quantities according to the following table:

Table 3 Available QuantitiesCharacter Quantity Abbreviation Availability0 relative humidity RH A, D1 temperature T A, D, F, H, N2 dewpoint

temperatureTd D, N

3 absolute humidity a D4 mixing ratio x D5 wet bulb

temperatureTw D

6 volumeconcentration

ppm H, N

7 water activity aw H, F8 relative humidity

of saturationRS H

9 saturationtemperature

Ts H

A water content w NA: available for HMT360AD: available for HMT360DF: available for HMT360FH: available for HMT360HN: available for HMT360N

Select the quantity for channel 1 with buttons and andacknowledge the selection with button E.

If the transmitter is equipped with two analog channels, select thequantity for channel 2 in the same way, for example:

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0505-289

Press button C to exit the display command mode or continue bysetting the pressure.

NOTE Remember to restore the DIP switch settings.

Scaling Analog OutputsTurn the internal CALIBRATION ENABLED/ DISABLED DIP switch of thetransmitter to upward position (ON). Press button C on the displaycover and a text similar to the following appears:

0505-290

Numbers on the second line indicate the low end scaling of channel 1currently stored in the transmitter memory. The text SET LO on thelower left corner indicates that you can now change the low endscaling with buttons and . Acknowledge the value with button Eand a text similar to the following appears:

0505-291

Numbers on the second line indicate the high end scaling of channel 1.The text SET HI on the lower left-hand corner indicates that you cannow change the high end scaling with buttons and .Acknowledge with button E.

If there is another channel available, the display shifts to the scalingmenu of channel 2. You can now scale the analog outputs for thechannel 2 in the same way as described above.


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Press button C to exit the display command mode or continue byselecting the output quantities. This menu starts automatically after thescaling menu only if the OUTPUT SELECTION DIP switches are on theposition SPECIAL (all up) from the beginning.


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Chapter 8 ____________________________________________________________ Serial Interface

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CHAPTER 8

SERIAL INTERFACE

WARNING The serial interface MUST NOT be used in hazardous areas.

Use the serial interface for calibration and testing purposes in safeareas only. Always use the serial interface cable (optional accessory,order code: 25905ZZ). Connect one end of the cable to the serial portof your computer and the other to the connector marked "RS 232C" onthe electronics unit of the transmitter (see Figure 4, item 9).

NOTE With serial communication the current consumption increasesapproximately to 7 mA and the transmitter is not able to operate with4 mA. Therefore, it is recommended to use serial communicationonly temporarily for changing settings or for calibrating thetransmitter in a safe area. With serial port, the minimum supplyvoltage is 15 VDC.

NOTE The transmitter incorporates a serial interface detector. However, notall terminals or PC serial ports (for example, optoisolated or ports notmeeting RS232C standards) recognize this standard. If thecommunication is not possible via a serial interface, use a forcedactivation by pressing simultaneously buttons and E on thetransmitter cover. To deactivate the forced activation, press thesebuttons again or reset the transmitter. If the transmitter does notreceive any commands for half an hour, it automatically closes theserial communication.

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Serial Communication SettingsTable 4 Serial Communications SettingsParameter Valuebauds 2400parity nonedata bits 8stop bits 1

To start giving commands, make sure that the HMT360 is connectedto a serial port of your computer and that the terminal session is open.Issue commands by typing them on your computer according to thefollowing instructions. In these commands, <cr> stands for pressingEnter (on your computer keyboard).

ASEL Selecting Analog OutputsSyntax: ASEL xxx yyy<cr>

where

xxx = Quantity of channel 1yyy = Quantity of channel 2

Turn the internal DIP switch CALIBRATION ENABLED/DISABLED to ON-position before the selecting the analog outputs and return it to OFF-position after selecting.


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Table 5 Output Quantities and Their AbbreviationsOutput Quantity AbbreviationRelative humidity RHTemperature TDewpoint temperature TdAbsolute humidity aMixing ratio xWet bulb temperature 1) TwMass proportion 1) ppmWater activity 1) awRelative humidity of saturation 1) RSSaturation temperature1 TsWater content 2) w

1) Available only for HMT368H for moisture measurements in liquid.2) Available only for HMT360N for natural gas.

Example:

>asel rh t<cr>Ch1 RH lo : 0.00 %RHCh1 RH hi : 100.00 %RHCh2 T lo : -40.00 'CCh2 T hi : 60.00 'C>

S Scaling Analog OutputsSyntax: Szz aa.a bb.b<cr>

where

zz = Quantity (RH, T, Td, x, a, Tw, ppm, aw, RS, Ts)aa.a = Lower limit of the quantitybb.b = Upper limit of the quantity

Turn the internal DIP switch CALIBRATION ENABLED/DISABLED to ON-position before the scaling the analog outputs and return it to OFF-position after scaling.

Example:

>SRH 0 100<cr>RH lo 0.00 %RHRH hi 100.00 %RH>Exception:

When you have natural gas transmitter and you scale the quantity ofwater content w (mg/m³ or lb/mmscf), issue command SNG1.

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Adjustment CommandsTurn the internal DIP switch CALIBRATION ENABLED/DISABLED to ON-position before the calibration and return it to OFF-position after thecalibration.

Note that HMT360 for natural gas can be checked but not adjusted bythe user.

CRH Relative Humidity Adjustment

NOTE Read also the calibrator, for example HMK15 manual and refer topage 56 of this manual for more detailed instructions on salt bathcalibration.

Syntax: CRH<cr>

The transmitter asks and measures relative humidity and calculates thecalibration coefficients.

Example:

>CRH<cr>RH : 1.82 1. ref ? 0 <cr>Press any key when ready... <cr>RH : 74.22 2. ref ? 75 <cr>OK>The OK indicates that the calibration has succeeded.

CT Temperature AdjustmentSyntax: CT<cr>

The transmitter asks and measures temperature readings and calculatesthe calibration coefficients.

Example:

>CT<cr>T : 0.81 1. ref ? 0.5 <cr>Press any key when ready... <cr>T : 99.12 2. ref ? 99.5 <cr>OK


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>The OK indicates that the calibration has succeeded. Whenperforming one-point calibration press only Enter for 2. reference.

ACAL Analog Output CalibrationSyntax: ACAL<cr>

Connect the HMT360 to a multimeter. Issue the ACAL command:

1. Disconnect the serial cable from the transmitter while readingthe multimeter value for the CH1 (I1).

2. Reconnect the serial cable. Type the multimeter reading andpress Enter.

3. Type the higher current multimeter reading and press Enter.

Example:

>ACAL<cr>Ch1 I1 (mA) ? 4.846 Ch1 I2 (mA) ? 19.987 >

Output Commands

ITEST Testing Analog OutputsSyntax: ITEST aa.aaa bb.bbb<cr>

where

aa.aaa = Current value to be set for channel 1 (mA)bb.bbb = Current value to be set for channel 2 (mA)

This command outputs the current value of each channel and thecorresponding control signal of the digital-to-analog converter.

Example:

>ITEST 8 12 <cr>8.000 3F8 12.000 70O>

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>ITEST<cr>6.349 25A 19.001 E93>

The set current values remain valid until you issue the commandITEST without readings. With this command the desired outputs ofthe transmitter are shown.

NOTE When outputting low currents from channel 1, remember to removeRS232C-cable while reading the current output, because of theincreased current consumption for using RS port.

SEND Outputting MeasurementValuesSyntax: SEND<cr>

This command outputs the measured values in one point.

R Activating Continuous OutputSyntax: R<cr>

With the command R the transmitter outputs measured valuescontinuously.

S Stopping Continuous OutputSyntax: S<cr>

The continuous outputting is stopped with the command S. Ifoutputting is active, this command is not echoed.

INTV Setting Output IntervalSyntax: INTV n xxx<cr>

where

n = 1 ... 255xxx = S, MIN, or H


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Sets the output interval when the transmitter outputs measurementreadings. The time interval is used when the continuous output isactive.

Example, the output interval is set to 10 minutes:

>INTV 10 min<cr>Output intrv. : 10 min>

PRES Setting Ambient Pressure forCalculationsSyntax: PRES aaaa.a<cr>

where

aaaa.a = Pressure (hPa)

Turn the internal DIP switch CALIBRATION ENABLED/DISABLED to ON-position before setting the pressure and return it to OFF-position aftermaking the setting.

Example:

>PRES 2400<cr>Pressure : 2400>

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Table 6 Pressure Conversion ChartFROM mmHg/Torr inHg atm bar psi

hPa/mbar

1 1.333224 33.86388 1013.25 1000 68.94757

mmHg/Torr

0.7500617 1 25.40000 760 750.0617 51.71493

inHg 0.02952999 0.03937008 1 29.921 29.52999 2.036021atm 0.00098692 0.00131597 0.033422 1 0.98692 0.068046bar 0.001 0.001333224 0.03386388 1.01325 1 0.06894757

TO

psi 0.01450377 0.01933678 0.4911541 14.6962 14.50377 1

Example:

29.9213 inHg = 29.9213 x 33.86388 = 1013.25 hPa / mbar

NOTE Conversions from mmHg and inHg are defined at 0 °C.

Chapter 9 __________________________________________________ Measuring at Overpressure

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CHAPTER 9

MEASURING AT OVERPRESSURE

The probes HMP362, HMP364 and HMP368 are designed forhumidity measurement at overpressure. The maximum measurementpressures depend on the probe as follows:

HMP362: 0 ... 167 bar (16,7 MPa), for natural gas, sample cellHMP302SC available

HMP364: 0 ... 100 bar (10 MPa), for pressurized rooms andprocesses, probe is provided with a nut, fitting screw andsealing washer

HMP368: 0 ... 40 bar (4 MPa), for pressurized pipelines, ball valveset available

The accuracy of the dewpoint measurement is affected by pressure inthe measurement chamber. The actual pressure in the sampling cellshall be set to the transmitter by using the serial line command PRES(PRES Setting Ambient Pressure for Calculations, page 59 or by usingthe keypad commands, page 47).

Pressure Regulator RecommendedWhen sampling pressurized processes exceeding the maximummeasurement pressure of the probe, the pressure in the measurementchamber must be regulated to acceptable level or below. It isrecommended to use pressure regulator before the measurementchamber to prevent remarkable pressure variations.

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Chapter 10 __________________________________________________Calibration and Adjustment

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CHAPTER 10

CALIBRATION AND ADJUSTMENT

Calibration IntervalHMT360 is calibrated as shipped from the factory. Typical humiditycalibration interval is one year. Depending on the application it maybe good to make the first calibration check earlier.

Factory Calibration and AdjustmentThe device (or only the electronics unit) can be sent to Vaisala ServiceCenters for calibration and adjustment, see contact information onpage 15.

NOTE HMT360 for natural gas must be adjusted always in Vaisala ServiceCenter.

User Calibration and AdjustmentNote that HMT360 for natural gas can be checked but not adjusted bya user.

Calibration is carried out by using the keypad or by using serialcommands. The following additional equipment is needed incalibration of the HMT360:

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- power supply for the channel(s) to be calibrated (12 ... 24 VDC),

- a multimeter for the HMT360 without a display, and

- the calibrated references.

First, the electronics unit is removed from the transmitter base toperform a calibration in safe area. Second, the power supply and amultimeter is connected to the electronics unit according to thefollowing instructions.

Removing Electronics Unit forCalibration

0505-292

Figure 22 Detaching Electronics Unit with Probe forCalibration

1. Unfasten the screws and open the cover.

2. Switch the transmitter off with the ON/OFF switch.

3. Disconnect the flat cable by lifting it carefully, for example witha screw-driver.

4. Turn the electronics unit slightly upwards to release it from thehinges. Leave the transmitter base with the cable connections onplace. When putting the electronics unit back to place, attach theupper hinge first.


VAISALA _______________________________________________________________________ 65

Connections

A1

B1

B2

A2

C1

C2

0505-293

Figure 23 Connecting Power Supply and Multimeter forCalibration

1. Connect with banana plugs a power supply (12 ... 24 VDC, witha serial port the minimum supply voltage is 15 VDC ) to theterminals B1 (-) and C1 (+) (channel 1), see Figure 23.

2. Connect the multimeter in series with the supply, B1 (-) andA1 (+).

3. Follow the same procedure with channel 2 using the terminalsB2 (-) and C2 (+). When calibrating both channels at the sametime, use two galvanically separated power supplies.

You can now calibrate or check the humidity and temperature or theanalog outputs according to the instructions given in calibrationchapters.

If the current measurement is needed in a hazardous area, themultimeter is connected to the terminals A1/A2 (+) and B1/B2 (-).Use only an approved multimeter.

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WARNING The power supply connectors (C1 and C2) MUST NOT be used inhazardous areas. For calibration in a hazardous area use only anapproved multimeter, which fulfils the safety factors printed on theprotective cover.

Calculating Correspondence of Current Valuesand Output Quantities

When using HMT360 without a display, calibration is carried out byusing a multimeter. Use the following equations to calculate thecurrent values corresponding the reference output quantities.

)-()-(mA 16mA 4

minmax

minref

QQQQI ⋅+= (1)

where

Qref = Reference value of the calibrated quantityQmin = Value corresponding to 4 mAQmax = Value corresponding to 20 mA

Example 1:

Relative humidity scaling 0 - 100 %RH, reference 11.3 %RH:

mA 808.5%RH) 0-%RH (100%RH) 0-%RH (11.3mA 16mA 4 =⋅+=I (2)

Example 2:

Temperature scaling -40 - +120 °C, reference 22.3 °C:

mA 10.230C)º 40-Cº (120C)º 40-Cº (22.3mA 16mA 4 =⋅+=I (3)


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Relative Humidity Calibration

Automatic Two-Point Calibration(Only with HMT360 with Display)The automatic calibration procedure is a user friendly way to calibratewith salt solutions; user do not have to feed the reference values to theHMT360. The transmitter displays the accurate value based on themeasured temperature and the Greenspan table stored into thetransmitter memory. The display chart of the calibration procedure ispresented in Figure 24 Display Chart of the Automatic CalibrationProcedure.

- Set the calibration DIP switch to ENABLED position and select RHcalibration by using switches 3 and 4 (see Chapter 5 DIP SwitchFunctions on page 42).

- Remove the filter and insert the probe head into a measurementhole of the LiCl salt chamber in the humidity calibrator.Acknowledge by pressing the button E. Alternatively select the 0.1(humidity in nitrogen) with buttons and . Acknowledge withthe button E.

- The transmitter remains to wait for the process stabilization (10-15min) and then stores the correction.

- Insert the probe head into a measurement hole of the NaCl saltchamber in the humidity calibrator. Acknowledge by pressing thebutton E. Alternatively you can select K2SO4 value with buttons and .

- The transmitter remains to wait for the stabilization and then storesthe correction. The text CAL PASS is displayed after the calibrationis performed.


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RHRH

Set Lo Set Lo

RH

Set Lo

RH

Set Lo

RH

Set Lo

RH

Set Lo

RH

Set Lo

RH

Set Lo

0505-294

Figure 24 Display Chart of the Automatic CalibrationProcedure


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Manual Calibration

Low End Adjustment

- Remove the filter and insert the probe head into a measurementhole of the dry end reference chamber (for example LiCl: 11 %RH)in the humidity calibrator.

NOTE If you use serial commands, please refer to page 56.

- Set the calibration DIP switch 2 to ENABLED (up) position andselect RH calibration by using switches 3 and 4 (see Chapter 5 DIPSwitch Functions on page 42).

- Press button C to ignore the automatic calibration procedure. Thehumidity reading measured by the transmitter appears on thedisplay and on the lower left corner you can see the text SET LO. Ifthe transmitter has no display, the LED indicator is blinking.

- According to the calibrator used, wait at least 10-15 minutes for thesensor to stabilize; use a multimeter or the transmitter display tomonitor the stabilization.

- Press the buttons and to adjust the display reading ormultimeter reading to correspond the reference value (when using amultimeter calculate the current value corresponding to thereference humidity by using the equations presented in page 66).Press the button E to conclude the low end adjustment.

- If the low end adjustment is sufficient, press the button E again toconclude the calibration and restore the DIP switch settings; set thecalibration DIP switch to position DISABLED (down). To continuewith the high end adjustment follow the instructions in nextchapter.

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High End Adjustment (Two-Point Calibration)

- After having made the low end adjustment, insert the probe headinto a measurement hole of the NaCl (75 %RH) salt chamber in thehumidity calibrator. Please, note that the difference between thetwo humidity references must be at least 30 %RH.


- The readings measured by the transmitter appear on the display, aswell as the text, SET HI on the lower left hand corner. If thetransmitter has no display, the LED indicator lights up.

- Wait at least 10 - 15 minutes for the sensor to stabilize; use amultimeter or the transmitter display to monitor the stabilization.

- Press the buttons and to adjust the display or multimeterreading (when using a multimeter calculate the current valuecorresponding to the reference humidity by using the equationspresented in page 66) and conclude the calibration with the buttonE.

- Restore the DIP switch settings. Set the calibration DIP switch toposition DISABLED (down).


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Temperature Calibration in OnePointAlways use a high quality standard for calibrating the temperature.


- Set the calibration DIP switch to position ENABLED (up).

- Set the calibration DIP switches to position TEMPERATURECALIBRATION according to the table printed on the protective cover.The temperature value measured by the transmitter appears on thedisplay as well as the text SET LO on the lower left corner. If thetransmitter has no display, the LED indicator starts to blink.

- Let the sensor stabilize; use a multimeter or the transmitter displayto monitor the stabilization.

- Press the buttons and to adjust the display or multimeterreading to correspond the reference value (when using a multimetercalculate the current value corresponding to the reference humidityby using the equations presented in page 66). Conclude the onepoint calibration by pressing the button E twice.

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Chapter 11 ____________________________________________________________ Specifications

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CHAPTER 11

SPECIFICATIONS

Performance

Relative HumidityTable 7 Relative Humidity SpecificationsProperty Description / ValueMeasurement range 0 ... 100 %RHAccuracy (including non-linearity and repeatability);when calibrated against:high quality, certified humiditystandards

salt solutions(ASTM E104-85)

± 1 %RH (0 ... 90 %RH)± 2 %RH (90 ... 100 %RH)

± 2 %RH (0 ... 90 %RH)± 3 %RH (90 ... 100 %RH)

Response time (90 %) at +20°Cin still air (with sintered filter)

15 seconds

Sensors:HUMICAP®180HUMICAP®L

for typical applicationsfor applications with a demandingchemical environment (max. +40 °C inhigh humidities)

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Moisture in Natural Gas(HMT362N/364N/368N)

Dewpoint Measurement

Table 8 Dewpoint Measurement SpecificationsProperty Description / ValueMeasurement range -50 ... +50 °C (-58 ... +122 °F) TdAccuracy ± 2 °C (± 3.6 °F) (see graph in Figure 25

below)Response time 63 % [90 %]-20 → +10 ° C (-4 → +50 ° F)+10 → -20 ° C (+50 → -4 ° F)

6 s [32 s]120 s [370 s]

Sensor Vaisala HUMICAP®180M

0505-295

Figure 25 Effect of Process Temperature on DewpointMeasurement Accuracy

Calculated Variables Available(Typical Ranges)Table 9 Calculated Variables SpecificationsProperty Description / ValueWater content 0 ... 20 lb/mmscf, 0 ... 326 mg/m³Parts per million by volume 0 ... 500 ppmv


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Water Activity in Jet FuelApplicationsTable 10 Water Activity in Jet Fuel Applications

SpecificationsProperty Description / ValueMeasurement range 0 ... 1 aw at -40 ... +180 °C

(-40 ... +356 °F)Accuracywhen calibrated against:high quality, certified humiditystandards

salt solutions(ASTM E104-85)

± 0.01 (0 ... 0.9)± 0.02 (0.9 ... 1.0)

± 0.02 (0 ... 0.9)± 0.03 (0.9 ... 1.0

Response time (90 %) at +20 °C in still oil (stainless steel filter)

10 min

Humidity sensor Vaisala HUMICAP®Calculated variables available water content

relative humidity for saturationtemperature

Accuracy of the water content better than ± 15 % of the reading

TemperatureTable 11 Temperature SpecificationsProperty Description / ValueMeasurement range -40 ... +180 °CTypical accuracy of electronicsat +20 °C

± 0.1 °C

Typical temperaturedependence of electronics

0.005 °C/°C

Sensor Pt 1000 RTD ⅓ Class B IEC 751

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Calculated Variables (TypicalRanges)

With HMP361 Probe

Table 12 HMP361 Calculated Variables SpecificationsProperty Description / ValueDewpoint temperature -40 ... +60 °CMixing ratio 0 ... 160 g/kg d.a.Absolute humidity 0 ... 160 g/m³Wet bulb temperature 0 ... +60 °C

With HMP363, HMP364, HMP365 & HMP368 Probes

Table 13 HMP363, HMP364, HMP365 & HMP368 ProbesCalculated Variables Specifications

Property Description / ValueDewpoint temperature -40 ... +100 °CMixing ratio 0 ... 500 g/kg d.a.Absolute humidity 0 ... 600 g/m³Wet bulb temperature 0 ... +100 °C

OutputsTable 14 Output SpecificationsProperty Description / ValueTwo analog outputs(one standard, one optional) two wire 4 ... 20 mATypical accuracy of analogoutputs at +20 °C ± 0.05 %/°C full scaleTypical temperaturedependence of analog outputs ± 0.005 %/°C full scaleRS232C serial output forservice use only in safe area

connector type RJ45

Output connections via safety barriers


VAISALA _______________________________________________________________________ 77

Classification with Current OutputsEU (94/9/EC, ATEX100a) II 1 G EEx ia IIC T4

PTB 00 ATEX 2112 XSafety factors: Ui=28 V, Ii=100 mA, Pi =0.7 W, Ci=1 nF,

Li=0 HEnvironmental specifications: Tamb = -20 ... +60 °C

Pamb = 0.8 ... 1.1 barDust classification (withprotection cover):

II 1 D (IP65 T= 70 °C)VTT 04 ATEX 023X

U.S.A. (FM) Classes I, II, IIIDivision 1: Groups A-GDivision 2: Groups A-D, F and GFM Project ID:3010615

Safety factors: Vmax = 28VDC, Imax = 100mA, Ci = 1nF,Li = 0, Pi = 0.7 W, Tamb = 60 °C, T5

Canada (CSA) Class 1, Divisions 1 and 2,Groups A, B, C, DClass II, Divisions 1 and 2, Groups G andCoal DustClass IIICSA File No: 213862 0 000;CSA report 1300863Tamb= 60 °C, T4

Japan (TIIS) Ex ia IIC T4Code number: C15354

Safety factors: Ui = 28 VDC, Ii = 100 mA, Ci = 1nF,Li = 0, Pi = 0.7 W Tamb = 60 °C

Australia (TestSafe) Certificate No: Ex AUS Ex 3738XMarking code: Ex ia IIC T5 IP65AUS Ex 3738X

Safety factors: Vmax = 28 VDC, Ii = 100 mA, Pi = 0.7 W,Ci = 1nF, Li = 0 mH

User's Guide ______________________________________________________________________

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GeneralTable 15 General SpecificationsProperty Description / ValueOperating voltage

with serial port (servicemode)

12 ... 28 V15 ... 28 V

Connections screw terminals, 0.33 ... 2.0 mm² wires(AWG 14-22)

Cable bushing Pg11 (5 ... 12 mm)Conduit fitting Pg11/NPT 1/2"-14Operating temperature rangefor electronics

with display and/or withstorage temperature range

-40 ... +60 °C

-40 ... +70 °CHousing material G-AlSi 10 Mg (DIN 1725)Housing classification IP 65 (NEMA 4)Housing dimensions 164 × 115 × 62 mmHousing weight 950 gFully electromagneticallycompatible according tostandards

EN 61326-1:1997 +Am :1998, Electricalequipment for measurement, control andlaboratory use - EMC requirements;Industrial environment

NOTE IEC 1000-4-5 complies only when using external EXi approved surgearrester on safe area.


VAISALA _______________________________________________________________________ 79

ProbesTable 16 Probe SpecificationsProperty Description / ValueProbe cable length 2, 5 or 10 mProbe cable diameter 5.5 mmSensor protection options stainless steel sintered filter

stainless steel gridPPS grid with steel nettingfilterPPS grid

HMP361 Probe - wall mountTemperature range -40 ... +60 °CHMP362 Probe - small pressure-tightTemperature range -40 ... +110 °CPressure range 0 ... 16.7 MPa (0 ... 167 bar)HMP363 Probe - confined spacesTemperature range -40 ... +120 °CHMP364 Probe - high pressuresTemperature range -40 ... +180 °CPressure range 0 ... 10 MPa (0 ... 100 bar)HMP365 Probe - high temperaturesTemperature range -40 ... +180 °CHMP368 Probe - pressurized pipelinesTemperature range -40 ... +180 °CPressure range 0 ... 4 MPa (0 ... 40 bar)

User's Guide ______________________________________________________________________

80 __________________________________________________________________ M010056EN-E

Options and AccessoriesTable 17 Options and Accessories TableDescription Value / Order CodeDisplay

character size (1st line/2ndline)

two-line LCD12 mm/10 mm

Calculated output variables dewpoint temperaturemixing ratioabsolute humiditywet bulb temperature

Additional analog output 4 ... 20 mADuct mounting installation kit(for HMP363 sensor head)

order code: HMP233FAH

Installation flange (for HMP365sensor head)

aluminiumstainless

HMP235FAHMP235FS

Ball valve set (for HMP368sensor head)

pressure range at 20 °C

DMP248BVS

0 ... 40 barSampling cell HMP302SCSerial interface cable for PCconnectors RJ45 - D9 female

25905ZZ

Rain shield HMT360SARProtection cover (for use in thepresence of combustible dust)

214101

HMK15 adapter fitting for 12mm probes

211011

Galvanic isolator 212483Barrier 210664


VAISALA _______________________________________________________________________ 81

Accuracy of Calculated Variables (Not Validwith HMT360 for Natural Gas)

Accuracy of the calculated variables depend on the calibrationaccuracy of the humidity and temperature sensors; here the accuracyare given for ±2 %RH and ±0.2 °C.

Accuracy of Dewpoint Temperature °C

Table 18 Accuracy of Dewpoint Temperature °CRelative humidity

Temp. 10 20 30 40 50 60 70 80 90 100-40 1.86 1.03 0.76 0.63 0.55 0.5 0.46 0.43 — —-20 2.18 1.19 0.88 0.72 0.62 0.56 0.51 0.48 — —0 2.51 1.37 1 0.81 0.7 0.63 0.57 0.53 0.5 0.4820 2.87 1.56 1.13 0.92 0.79 0.7 0.64 0.59 0.55 0.5340 3.24 1.76 1.27 1.03 0.88 0.78 0.71 0.65 0.61 0.5860 3.6 1.96 1.42 1.14 0.97 0.86 0.78 0.72 0.67 0.6480 4.01 2.18 1.58 1.27 1.08 0.95 0.86 0.79 0.74 0.7100 4.42 2.41 1.74 1.4 1.19 1.05 0.95 0.87 0.81 0.76120 4.86 2.66 1.92 1.54 1.31 1.16 1.04 0.96 0.89 0.84140 5.31 2.91 2.1 1.69 1.44 1.26 1.14 1.05 0.97 0.91160 5.8 3.18 2.3 1.85 1.57 1.38 1.24 1.14 1.06 0.99

Accuracy of Mixing Ratio g/kg

(Ambient pressure 1013 mbar)

Table 19 Accuracy of Mixing Rratio g/kgRelative humidity

Temp. 10 20 30 40 50 60 70 80 90 100-40 0.003 0.003 0.003 0.003 0.003 0.004 0.004 0.004 — —-20 0.017 0.018 0.019 0.021 0.022 0.023 0.025 0.026 — —0 0.08 0.09 0.09 0.1 0.1 0.11 0.11 0.12 0.13 0.1320 0.31 0.33 0.35 0.37 0.39 0.41 0.43 0.45 0.47 0.4940 0.97 1.03 1.1 1.17 1.24 1.31 1.38 1.46 1.54 1.6260 2.68 2.91 3.16 3.43 3.72 4.04 4.38 4.75 5.15 5.5880 6.73 7.73 8.92 10.34 12.05 14.14 16.71 19.92 24.01 29.29100 16.26 21.34 28.89 40.75 60.86 98.85 183.66 438.56 — —120 40.83 74.66 172.36 — — — — — — —

User's Guide ______________________________________________________________________

82 __________________________________________________________________ M010056EN-E

Accuracy of Wet Bulb Temperature °C

Table 20 Accuracy of Wet Bulb Temperature °CRelative humidity

Temp. 10 20 30 40 50 60 70 80 90 100-40 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 — —-20 0.21 0.21 0.22 0.22 0.22 0.22 0.23 0.23 — —0 0.27 0.28 0.28 0.29 0.29 0.29 0.3 0.3 0.31 0.3120 0.45 0.45 0.45 0.44 0.44 0.44 0.43 0.43 0.42 0.4240 0.84 0.77 0.72 0.67 0.64 0.61 0.58 0.56 0.54 0.5260 1.45 1.2 1.03 0.91 0.83 0.76 0.71 0.67 0.63 0.680 2.23 1.64 1.32 1.13 0.99 0.89 0.82 0.76 0.72 0.68100 3.06 2.04 1.58 1.31 1.14 1.01 0.92 0.85 0.8 0.75120 3.85 2.4 1.81 1.48 1.28 1.13 1.03 0.95 0.88 0.83140 4.57 2.73 2.03 1.65 1.41 1.25 1.13 1.04 0.97 0.91160 5.25 3.06 2.25 1.82 1.55 1.37 1.24 1.13 1.05 0.99

Accuracy of Absolute Humidity g/m³

Table 21 Accuracy of Absolute Humidity g/m³Relative humidity

Temp. 10 20 30 40 50 60 70 80 90 100-40 0.004 0.004 0.005 0.005 0.005 0.006 0.006 0.006 — —-20 0.023 0.025 0.027 0.029 0.031 0.032 0.034 0.036 — —0 0.1 0.11 0.12 0.13 0.13 0.14 0.15 0.15 0.16 0.1720 0.37 0.39 0.41 0.43 0.45 0.47 0.49 0.51 0.53 0.5540 1.08 1.13 1.18 1.24 1.29 1.34 1.39 1.44 1.49 1.5460 2.73 2.84 2.95 3.07 3.18 3.29 3.4 3.52 3.63 3.7480 6.08 6.3 6.51 6.73 6.95 7.17 7.39 7.61 7.83 8.05100 12.2 12.6 13 13.4 13.8 14.2 14.6 15 15.3 15.7120 22.6 23.3 23.9 24.6 25.2 25.8 26.5 27.1 27.8 28.4140 39.1 40 41 42 43 44 45 45.9 46.9 47.9160 63.5 64.9 66.4 67.8 69.2 70.7 72.1 73.5 74.9 76.4

Appendix A ______________________________________________________________Dimensions

VAISALA _______________________________________________________________________ 83

APPENDIX A

DIMENSIONS

HMP361

User's Guide ______________________________________________________________________

84 __________________________________________________________________ M010056EN-E

0505-296

HMP362

Flange intersection

Sample cell HMP302SC

ø36 (1.42)

ø32 (1.26)

41(1.61)

M6

ø12

(0.

47)

1/8"

-27

NP

T

9(0.35)

7 (0.28)71.5 (2.81)

92.5 (3.64)

81 (3.19)

71 (2.80)

58.7 (2.31)

16 (0

.63)

ø24.5

45°45° 45°

M6

ø12

.5 (

0.49

)

1/8"-27 NPT

0505-297


VAISALA _______________________________________________________________________ 85

HMP363

0505-298

HMP364

0505-299

HMP365

User's Guide ______________________________________________________________________

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0505-300

HMP368

0505-301

Mounting Plate


VAISALA _______________________________________________________________________ 87

0505-302

Rain Shield

User's Guide ______________________________________________________________________

88 __________________________________________________________________ M010056EN-E

0505-303

Protection Cover160

224

208

189

Ø 8.2

184

2

96

82

0505-304

Appendix B __________________________ WIRING FOR INTRINSICALLY SAFE OPERATION, FM

VAISALA _______________________________________________________________________ 89

APPENDIX B

WIRING FOR INTRINSICALLY SAFEOPERATION, FM

HMT360-series transmitters are approvedfor use in Classes I, II and III,Division 1, Groups A - G andDivision 2, Groups A - D, F and G.

Safety factors for HMT360-series transmittersare: Vmax=28V, Imax=100mA, Ci=1nF, Li=0, Pi=0.7W

NOTE:1. Barrier installation must be completed in accordance with ANSI/IS A RP 12.6 and the National Electrical Code.2. Intrinsically safe barrier ground must be less than 1 ohm.3. Maximum safe area voltage is 250 V.

Replaces

Replacedby

Accepted

Handler

Creator

Checked

Scale

Title

Status

Code Rev

01-09-04 ARH

1:1

CONTROL DRAWNING

DRW211603 A

-Ch2+

HMT360 connection board

HAZARDOUS AREA

-Ch1+

SAFE AREA

Load Ch1

Vmax=28VDC

Vmax=28VDC

Load Ch2

Use FM approved associated apparatus;zener barriers or galvanic separatorswith entity concept parameters:Voc < 28 VIsc < 100mACa > Ci + CcableLa > Li + Lcable

Vaisala OyjVanha Nurmijärventie 2 1VantaaFinland

Material Weight Finish

Part list

General tolerance

User's Guide ______________________________________________________________________

90 __________________________________________________________________ M010056EN-E


0505-305

Appendix C _________________________ WIRING FOR INTRINSICALLY SAFE OPERATION, CSA

VAISALA _______________________________________________________________________ 91

APPENDIX C

WIRING FOR INTRINSICALLY SAFEOPERATION, CSA

User's Guide ______________________________________________________________________

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Appendix D ______________________________________________________________ Certificates

VAISALA _______________________________________________________________________ 93

APPENDIX D

CERTIFICATES

User's Guide ______________________________________________________________________

94 __________________________________________________________________ M010056EN-E

Appendix D ______________________________________________________________ Certificates

VAISALA _______________________________________________________________________ 95

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