M2A-XL Transmitter Operator’s Manual
Chapter 4: Operation
•
43
Alarm Indications
NOTE:
The M2A-XL includes alarm on and alarm off delay settings for alarm 1 and alarm 2.
The alarm indications described in this section operate according to the factory set
alarm settings. See Table 11 on page 48 for all the factory settings.
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.
Table 10: Visual and Audible Alarm Indications
Condition
Cause
Visual Indication(s)
Alarm 1
*
Increasing (decreasing for O
2
) gas
reading at or above the alarm 1 set
-
point
• A1 LED is on
• Gas reading alternates with
ALARM-1
message
Alarm 2
*
Increasing gas reading at or above the
alarm 2 setpoint
• A2 LED is on
• Gas reading alternates with
ALARM-2
message
Fail
• Disconnected or misconnected
detector wiring
• 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.
• 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
*
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.
