User guide

65-2649RK-CH4-4 M2A Transmitter Operator’s Manual 20
NOTE: If the M2A is in both an alarm 1 and alarm 2 condition, both the A1 and A2
LEDs will be on, the gas reading will alternate with the ALMS 1&2 message,
and both alarm relays will energize.
Responding to an Alarm 2 Condition
1. Follow your established procedure for a high level combustible gas condition.
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 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 indicates a fail condition for any of the following:
• The detector wiring is disconnected or incorrectly connected.
• The display reading is -10% of full scale or lower.
When the M2A 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.
Low Power Alarm
Low Power Alarm Indications
The M2A senses a low power condition when the DC power source is 9.5 volts or less.
WARNING: While in a low power condition, the M2A is not an active gas monitor.
When the M2A senses a low power condition, it alerts you as follows:
• The F LED turns on.
•The message LowPower is indicated on the top line of the OLED display and the
input voltage is displayed on the bottom line of the OLED display.
• The fail relay de-energizes.