Manual

27 M2 Transmitter Operator’s Manual
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 M2 senses an alarm 1 condition.
The M2 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 LCD, and de-energizes the alarm 1 relay.
NOTE: If the ENTER button is pressed while the M2 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.
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 18.5 volts. • F LED is on
• LowPower message and
actual voltage of
incoming DC power
*
1
If the M2 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 5: Visual and Audible Alarm Indications
Condition Cause Visual Indication(s)