Zero Recalibration Procedure; Span Verification; Span Recalibration Procedure - AMC SIR Series Instruction Manual

Refrigerant gas sensor/transmitter

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AMC-SIR Refrigerant Gas Sensor/Transmitter

5.2.2 ZERO RECALIBRATION PROCEDURE

1. Disconnect power at the plug-in TB-2 terminal. Ensure both JP2 and JP3 jumpers are

not installed, then re-connect power to AMC-SIR. Wait for Sensor to finish boot up stage

(3 minutes after power up) before applying the zero gas as above and make sure that

the sensor has been completely purged. (Minimum of 4 minutes)

2. While the zero gas is still being applied, locate JP2 jumper and connect to JP2 position.

Yellow Status LED flashes on then becomes steady. If this Yellow LED continues to

flash, contact Armstrong Monitoring for service.

3. The output current on the meter should indicate 0mA with a solid Yellow Status LED.

Removing JP2 jumper will incorporate the setting into the module. The Green Status

LED's flashes 3 seconds to confirm. If Red Status LED flashes an error has occurred

and process must be repeated. The output current on the meter should now read 0mA.

4. Remove power and add the JP3 Jumper then proceed to Span Calibration.

The span should be checked with a precision sample of gas, equivalent to the concentration

shown in Factory Calibration (Section 2.3.) Gas should be applied at 0.5lpm using the AMC-FL1

calibration adapter, as shown in Figure 5-1.

1. Apply span gas (100% full scale) to the sensor until it is purged. The output measured at

the cal jack should be 20mA. If the current measured is off by more than +/-5% then

proceed to the Span Recalibration Procedure below.

5.2.4

1. Disconnect power at the plug-in TB-2 terminal. Ensure JP3 is installed and JP2 is not

installed and re-connect power. Four minutes after power up start to apply span gas to

the sensor until it is purged and then wait until stable full scale reading is attained.

2. Jumper JP2 must now be installed. The Yellow Status LED flashes to indicate checking

of the span gas. This LED should then permanently illuminate to indicate a successful

calibration. If it continues to flash, the calibration gas may be deficient. Remove JP2 to

load this calibration into the sensor module. The Green Status LED flashes for 3

seconds to confirm.

3. The output measured at the cal jack should be 20mA +/-5%. If this is not the case or the

yellow LED continues to flash in step 2 contact Armstrong Monitoring for service.

Caution:

Only use the Full Range (20mA) gas concentration as defined in Factory Calibration

(Section 2.3)

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