65-2640RK-05-04 M2A Transmitter Operator’s Manual
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 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 gas 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 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.
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.
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 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)
