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5 OPERATION AND CALIBRATION
5.1 OPERATION
Note:
BEFORE turning on the main power to the monitor, MAKE SURE all connections are
properly made.
Once power has been turned on, the GREEN power LED will light. A one-minute time delay
eliminates false alarms from occurring during the sensor's warm up period. After this time
delay, the unit becomes fully operational.
indicator is not needed, the three-circuit miniature switch can be set accordingly. Refer to
Section 3, Item 9 and Figure 1.
If any gas surrounding the sensor exceeds the low alarm trip point setting, the YELLOW LED
and low alarm relay will be activated. If any gas exceeds the high alarm trip point setting, the
RED LED, high alarm relay and audio alarm will be activated. An open sensor circuit is indicated
by the amber fail LED.
5.2 CALIBRATION
As the calibration procedure may cause the monitoring equipment to give a false alarm,
appropriate precautions should be taken. Instructions on introducing the gas sample are
included with the calibration kit or available separately (depending on type of gas or application).
To observe immediate reaction during calibration, the low and high alarm time delays should be
disabled.
5.2.1 EQUIPMENT REQUIRED
•
Digital multimeter (for non-display versions)
•
Miniature screwdriver
•
Calibration gas (es)
•
Calibration kit
5.2.2 ADJUSTMENTS
For full recalibration adjustments, follow the Set-Up Procedure steps 1 to 8 inclusive. There are
two adjustments to be made for periodic recalibration: Zero and Span adjustments and the
Alarm adjustments. Alarm adjustments are only required if the user wants to change alarms.
Refer to Figure 6 to perform the following procedure
1) Remove cover from monitor enclosure.
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.
AMC-1040 CO / NO2 Vehicle Exhaust
If time delays are required or the audio alarm
11
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