M2A-XL Transmitter Operator’s Manual
Chapter 4: Operation
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2. After the gas reading falls below the alarm 2 setpoint, press the ENTER button to reset the
alarm circuit. Resetting the alarm circuit turns off the A2 light, resets the OLED display, and
de-energizes the alarm 2 relay.
NOTE:
If the ENTER button is pressed while the M2A-XL is in an alarm 2
condition, the A2 LED will flash but all other indications will remain
unchanged.
You cannot de-energize the alarm 2 relay until the gas reading falls below
the alarm 2 setpoint.
Fail Condition
Fail Condition Indications
The M2A-XL indicates a fail condition for any of the following:
• The detector wiring is disconnected or incorrectly connected.
• The plug-in sensor is not properly plugged into the socket in the detector housing body.
NOTE:
It could take up to 40 minutes for a disconnected CT-7 style NH
3
plug-in sensor to
trigger a fail condition.
• The display reading is -10% of full scale or lower.
When the M2A-XL senses a fail condition, it alerts you as follows:
• The F LED turns on.
• The gas reading is replaced by the
FAIL
message.
• The fail relay de-energizes.
NOTE:
The fail alarm has a 30 second delay.
Responding to a Fail Condition
1. Verify that the detector wiring is correctly and securely connected.
2. If the M2A-XL has a replaceable plug-in sensor, verify that the replaceable plug-in sensor in
the detector housing is properly installed.
