AMC 210 Series Petunjuk Manual - Halaman 15

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AMC-210 Transmitter with external electrochemical sensor

5.2.1 EQUIPMENT REQUIRED

•

Digital multimeter with a minimum display range of 20.0 mA.

•

Remote calibration lead provided with the transmitter.

•

Miniature screwdriver trimmer adjustment tool.

•

Calibration adapter

•

Zero & Span gases and regulator (Contact factory for information)

5.2.2 TRANSMITTER CALIBRATION/VERIFICATION SET-UP PROCEDURE

Note:

When applying gas, a flow rate of 0.5 to 1 liter per minute is recommended.

As the calibration procedure may cause the monitoring equipment to give a false alarm,

appropriate precautions should be taken.

To perform the following Set-Up procedure (refer to Figure 6)

1) Remove cover from transmitter housing.

2) Plug in standard test leads fully into jacks on multimeter.

3) Switch ON multimeter and select the DC Volts range greater that 1.00 VDC.

4) Apply a Zero gas sample, or with the sensor in clean air, adjust the Zero trimmer for

a stabilized reading approaching of 0.000 VDC measured at the test points. This

measurement ideally should lie in the range of – 0.005 to 0.000 VDC.

5) Unplug test leads and connect the "Remote Calibration Lead" to the multimeter.

BLACK lead to negative or common (–)

RED lead to positive (+)

6) Select the next range greater than 20 mA DC full scale on the multimeter.

7) Insert the plug end of the "Remote Calibration Lead" fully into the CAL jack on the

transmitter.

8) Adjust the 4 mA trimmer until the multimeter reads 4.00 mA.

9) Apply a Span gas sample and adjust Span trimmer to 20 mA when full-scale gas

concentration is used.

Note: The Span gas sample need not be of the full-scale concentration but may be a

fraction of this. Since the transmitter output range is 4 to 20 mA, a full scale

concentration gas should read 20 mA after a few moments of sensor exposure.

Similarly, a half scale concentration gas should read 12 mA.