M2A Transmitter Operator’s Manual 39
NOTE: You can select normally energized (N. EN) or normally de-energized (N. DE-EN) alarm 1 and alarm
2 relay settings in Configuration Mode. The following sections describe the standard factory setting
for these relays which is N. DE-EN.
The fail relay is factory set as N. EN and is not user-adjustable.
Alarm 1 Condition
Alarm 1 Condition Indications
When the gas reading reaches the alarm 1 setpoint, the M2A senses an alarm 1 condition. The M2A alerts you to
an alarm 1 condition as follows:
• The A1 LED turns on.
• The gas reading alternates with the ALARM-1 message.
• The alarm 1 relay energizes.
Responding to an Alarm 1 Condition
1. Follow your established procedure for a low level combustible or toxic gas condition or a decreasing oxygen
concentration condition.
2. After the gas reading falls below (above for oxygen) the alarm 1 setpoint, press the ENTER button to reset
the alarm 1 circuit. Resetting the alarm 1 circuit turns off the A1 LED, resets the OLED display, and de-
energizes the alarm 1 relay.
NOTE: If the ENTER button is pressed while the M2A is in an alarm 1 condition, the A1 LED will flash but
all other indications will remain unchanged.
You cannot de-energize the alarm 1 relay until the gas reading falls below (above for oxygen) the
alarm 1 setpoint.
Alarm 2 Condition
Alarm 2 Condition Indications
When the gas reading reaches the alarm 2 setpoint, the M2A senses an alarm 2 condition. The M2A alerts you to
an alarm 2 condition as follows:
• The A2 LED turns on.
• The gas reading alternates with the ALARM-2 message.
• The alarm 2 relay energizes.
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 or toxic gas condition or an increasing
oxygen concentration 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.
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