AMC 2751 Manuel d'instruction - Page 14

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5.2.1 ON SITE CALIBRATION EQUIPMENT REQUIRED

For qualified personnel, the following is a recommended list of calibration equipment required.

•

A digital multi-meter with a range of 20.0 mA or more and 200 mV or more.

•

A "Remote Calibration Lead" (P/N 2900-01) for the above meter ( available from AMC )

•

A set of leads with clip on probes for the above meter

•

Miniature screwdriver trimmer adjustment tool

•

Calibration adapter, available from AMC

•

Zero & Span gases ( contact AMC for information )

•

Clean, low static cloth or tissue to cover sides of sensor during calibration

5.2.2 CALIBRATION PROCEDURE

The transmitter is equipped with a remote calibration feature allowing for one-man calibration at

the transmitter location. The transmitter output is measured using the plug-in type "Remote

Calibration Lead". In most cases it is only Zero and Span adjustments that are made in field

calibrations.

Note:

The calibration procedure may cause false alarm and or fail signal.

precautions may be required.

Refer to Figure 6 to perform the following calibration procedure:

1) Remove cover from transmitter housing.

2) Attach and set the multi-meters as shown.

3) Cover the sides of sensor with a clean cloth or similar to prevent a draft on the

sensor.

4) Apply a Zero gas sample, with a calibration adapter cup firmly and completely over

the sensor opening on side of AMC-2751 for 2 minutes with a flow rate of .5 liters per

minute.

5) At 2 minutes adjust the Zero trimmer for a zero current of 4.00 mA +/- .1ma. Note

that the zero current may give a signal representing a gas concentration as high as

2ppm depending on the zero gas used.

6) Apply the Span gas sample, with a calibration adapter cup firmly and completely over

the sensor opening on side of AMC-2751 for 2 minutes with a flow rate of .5 liters per

minute.

7) At 2 minutes adjust the Span trimmer for the Span current reading of 20 ma +/- .16

mA.

AMC-2751 Transmitter & Sensor

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