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AMC-1ACOs One Channel CO Monitor with DSI
becomes active (jumpers set to "normally de-energized"), a controller failure or controller power
failure will prevent an alarm condition from being produced. The opposite setting of jumpers
(relay "normally energized") will result in an alarm condition produced on reaching the gas
threshold level, controller failure or controller power failure.
5.2 CALIBRATION
Gas sensors need to be calibrated and periodically checked to ensure sensor accuracy and
system integrity.
The AMC-1ACOs series comes factory calibrated and does not need to be adjusted as part of
installation. Calibration of the CO sensor is recommended two times per year and all peripherals
and/or relays should be checked twice a year. The AMC-DSI is part of the EZ Cal Sensor
Replacement Program, for further information please contact the factory. Direct service
enquiries
to
The
service@armstrongmonitoring.com. The monitor should not need re-calibration when first
installed and powered up, but a test for correct operation is recommended after a stabilization
period.
5.2.1 TRIP THRESHOLD ADJUSTMENT
This section discusses the adjustment of the WARNING and ALARM thresholds on the Gas
Monitor.
The CO sensor supplies a linear 4 to 20 mA signal to the monitor via the DSI card. This
translates to a 0.4 to 2.0 volt DC signal at TP4, see Figure 11.
correspond to some fraction of the sensor's full scale calibration, see section 2 PRODUCT
INFORMATION.
Table 8 and Figure 11 below are provided to identify key components used in trip threshold
adjustment.
RV5 is used to set a threshold at which the WARNING is triggered. TP5 is used to
monitor these WARNING levels.
RV6 is used to set a threshold at which the ALARM is triggered. TP6 is used to
monitor these ALARM levels.
Test Points
Trimpots
Armstrong
Monitoring
TABLE 8: Test points and trimpots allocation
Reference Points
Signal
WARNING
ALARM
Ground
WARNING
ALARM
Corp
at
CO Sensor
TP4
TP5
TP6
TP22 (or TP4 on DSI card)
RV5
RV6
22
(800)465-5777
or
The alarms are set to
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