Armstrong Monitoring AMC-1222, Instructions Manual

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AMC-1222 CO/NO
2
Multidrop
16
5.2 CALIBRATION
The AMC-1222 sensor module is factory calibrated at levels based on set standards.
Calibration of the module should last for the life of the sensor, with few periodic adjustments. All
on-site adjustments are made at each sensor module. Recalibration is necessary when
replacing the sensor. Factory or on-site calibration services, customer training, and/or
calibration adapter can be provided. Specify each sensor module’s model number and gas
when requesting any of the above. Refer to sections 2.1 Sensor module and/or 2.2 FACTORY
CALIBRATION for any of the above required information.
Notes:
- The calibration procedure is the same whether the module is in current or voltage mode.
Voltage is measured at the test points when the module is in either mode.
Equipment Required:

Digital Multimeter

Miniature slot screw driver

CO and NO
2
Calibration Adapters

Zero & Span gases and regulator (Contact factory for information)
5.2.1 ZERO ADJUSTMENT (CO)
Step 1 Remove cover
Step 2 Power unit from 12-24VDC Supply, Ensure green power LED illuminates. If power LED
is flashing ensure EOL (end of line) Switch(es) are set correctly.
Step 3 Set multimeter to DC voltage range suitable for reading 2.00VDC
Step 4 Connect Multimeter to COM(-) and TP2 as shown in
Figure 5-1
Step 5 Apply Zero gas @ 1L/min
Step 6 After signal reading has stabilized (approx 1 min) adjust Zero Potentiometer to
0.00VDC
Step 7 Remove calibration gas
5.2.2 SPAN ADJUSTMENT FOR (CO) 100 PPM (AMC1222-1 AND -2 VARIANTS)
Step 8 Apply CO span gas, CO span gas concentration should be in 25ppm to 100ppm CO
range
Step 9 After the signal reading has stabilized (approx 3 min) adjust Span potentiometer to
2.00VDC/100*Span gas concentration. i.e. if using 50 ppm CO
2.00VDC/100*50=1.00VDC
Step 10 If Signal > .7VDC verify CO Alarm LED Flashes, If Signal > 2.00VDC verify CO Alarm
LED Illuminates steady State
Step 11 Remove Gas, Calibration complete