65-2660XL-XX-04 M2A-XL Transmitter
Chapter 4: Operation
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25
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-XL senses an alarm 1 condition. The
M2A-XL 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 carbon dioxide condition.
2. After the gas reading falls below 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-XL 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
the alarm 1 setpoint.
Fail
• Disconnected or misconnected
detector wiring
• Display reading at -10% of full
scale or lower
• Defective components
• F LED is on
•
FAIL
message replaces
gas reading
NOTE: There is a 30 second
delay on the fail condition.
Low Power
DC power source less than 9.5 volts.
• F LED is on
•
LowPower
message and
actual voltage of incoming
DC power
1
If the M2A-XL is in both an alarm 1 and an alarm 2 condition, both alarm LEDs are on and
the display alternates between the gas reading and the ALMS 1&2 message.
Table 4: Visual and Audible Alarm Indications
Condition
Cause
Visual Indication(s)
