two pen recorders

Two Pen Recorders • Two pen recorders permit

monitoring of two independent processes with one recorder.

• A variety of input signal types, together with wide availability and ease of use make these recorders ideal monitoring devices for lower accuracy environments.

• The recorders are very reliable and are accurate enough for most operations. This type of recorder is suited for measurement of pressures, time, temperature, force, fluid levels, pH and other signals.

8/25/2015 1 George E. King Engineering

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What is a data/chart recorder?

• A data/chart recorder is an electronic

instrument that keeps track of measurements

required in a process or production. It may

record variables such as pressure,

temperature, pH or other variables.

• There are many types of data recorder

models on the market that use paper and a

pen to measure single or multiple inputs. ,

• High end models can record up to 30 inputs.


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Types of Data or Chart Recorders

• Strip Chart Recorders - have a roll of paper that passes continuously beneath one or more pens. They are well suited to continuous processes.

• Circular Chart Recorders – a circular chart rotates counter clockwise under one or more pens that deflect according to an electrical signal.

• X-Y Recorders - These accept two inputs and create a graph that displays activity of one data set against another. Very useful for determining relationships between two data inputs.

• Hybrid Recorders - can function as a recorder and a data logger. The input may be routed to an analog-to-digital converter.


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The Older Chart Recorders -

• The following slides are for the older style of recorders that are still in wide use.


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Pressure Measurement

• Static pressure measurement is via a helical

bourdon tube connected to system piping.

Range is 0 to 30 inches of mercury on

vacuum (30” Hg = 1 atmosphere or 14.7

psia)., and 0 to 8000 psig (1 to 545 atm).

•


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New Models

Input Types RTD, 0-1 volt, 0-5 volts, 1-5

volts, 0-10 volts, 4-20mA

Temperature Accuracy +/- 0.25 º C (0.5 º F)

Voltage / Current Accuracy +/- 0.25% of Span

Chart Rotation Speed 7 day or 24 hour

Ambient Operating

Conditions

0 º to +40 º C, 0-95% RH,

Non-condensing

Relay Contacts 1 Amp @ 120 VAC

Pen Type Red and Blue Fiber Tipped

Battery Backup One 9 Volt Alkaline Battery

Battery Backup Life Minimum 24 hours


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Data Recording - Backup

• Record and optional alarm settings are

easily set for multiple track recordings.

• Battery backup will continuously record up

to 48 hr in the event of a power outage.


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Chart Numbers Deciphered


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Trouble Shooting – Depends on

the Model Indication Explanation

The LED is blinking on & off, but the

temperature is correct

The unit is running on battery.

There is a 4-hour difference from red

pen & blue pen, which pen is used as

time mark?

There is a difference w/ any two pen

recorder Designate one pen as a time mark.

What is the type of sensor wire? Solid state temperature sensing device is

used. Older units used type "J"

thermocouple wire.

Can additional internal adjustments

be made?

No, all adjustments are on the front of the

unit. All calibrations must be done @ the

factory or the warranty will be voided.

Which direction does chart rotate? CCW

What is response time? 2 - 3 samples per second typical


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Pen Replacement

Open the case and after removing the old pens, replace with the correct part. The pens may need to be zeroed before use.


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The Settings – What and How

to Calibrate

• Pressure Recording – what are the maximum

and minimum ranges of pressure. How fast

does the sampling rate need to be? A two-

pen recorder will only record from 1 to 3

measurements per second at maximum. Line

width may also be an issue.


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A Few Chart Types

Chart Size Time Marker Type

Range Divisions

4 inch chart

7 day Ink -50 to +40 2

6 inch chart

24 hour Ink -200 to +200

10

6 inch chart

24 hour Ink -150 to +100

5

6 inch chart

24 hour Ink -30 to +120

2

8 inch chart

7 day Ink 0 to 30 0.5


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Reading the Chart

1. Range of the chart must be matched to the input to get accurate readings.

2. Pens must be homed or zeroed with calibration to start on the graph.

3. Charts turn CCW.

4. Extremes of pen movement (off scale) can produce ghosts on the paper – check the range settings.

5. Check the time drive setting. 8/25/2015 13

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Examples


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A Gas Lift Chart – Is this Accuracy Sufficient?


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A 24-hour chart.


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two pen recorders

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