14
A100b
JAN 2009
TROUBLESHOOTING GAS MONITORS
Symptom: No lights displayed on panel.
Cause:
Power failure. Check incoming line.
1.
Tripped circuit breaker or blown fuse on electrical
2.
supply.
Unit warming up. It takes 3-5 minutes after power
3.
is switched on.
Symptom: Red light is on, but no alarm condition
is active. (i.e. No horn or no relay operation after 3
minutes).
Cause:
Check to be sure the horn has not been
1.
deactivated by Key switch.
Possible wiring or sensor fault. Check wiring and
2.
connections for continuity.
Check calibration for proper alarm levels.
3.
Resistor missing from unused sensor channel.
4.
Install 3.3K ohm resistor across terminal 1 and 2.
TROUBLESHOOTING GAS SENSORS
Symptom: Sensor green light is off.
Cause:
Possible wiring fault between controller and
1.
sensor. Check power supply to Controller. Check
connections between the controller and the
sensor. Check wires are connected to the proper
number terminal.
On HLM6 monitor, check the fuse corresponding
2.
to the par ticular sensor.
Sensor possibly damaged. Check by installing
3.
another sensor to confirm sensor fault.
Symptom: Output from sensor is 0.5mA (for 4-20mA
output). Output from sensor is 0 V or .5V (for 0-10, 0-5,
1-10, 1-5 output signals).
Cause:
Sensing element is disconnected from printed
1.
circuit board.
Sensing element failed.
2.
Check: Check wiring and check sensor element for
proper installation.
