RKI Instruments M2A - Manual (Page 33)

M2A Transmitter Operator’s Manual 28
Alarm Indications
NOTE: The M2A 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 6 on page 32 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.
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 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
Table 5: Visual and Audible Alarm Indications
Condition Cause Visual Indication(s)
Alarm 1
1 Increasing (decreasing for O
2
) gas reading at
or above the alarm 1 setpoint
• A1 LED is on
• Gas reading alternates with
ALARM-1 message
Alarm 2
1 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
• 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 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.