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65-2641RK-03 M2A 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 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 hydrogen 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)
