RKI Instruments M2 for 12 VDC - Manual (Page 21)

M2 Transmitter Operator’s Manual, 12 VDC Operation 16
NOTE: If the ENTER button is pressed while the M2 is in an alarm 2 condition, the A2
LED will flash but all other indications will remain unchanged.
You cannot de-energize the alarm 2 relay until the gas reading falls below the
alarm 2 setpoint.
Fail Condition
Fail Condition Indications
The M2 indicates a fail condition for any of the following:
• The detector wiring is disconnected or incorrectly connected.
• The display reading is -10% of full scale or lower.
When the M2 senses a fail condition, it alerts you as follows:
• The F LED turns on.
• The gas reading is replaced by the FAIL message.
• The fail relay de-energizes.
NOTE: The fail alarm has a 30 second delay.
Responding to a Fail Condition
Verify that the detector wiring is correctly and securely connected.
Low Power Alarm
Low Power Alarm Indications
The M2 senses a low power condition when the DC power source is 10.5 volts or less.
WARNING: While in a low power condition, the M2 is not an active gas monitor.
When the M2 senses a low power condition, it alerts you as follows:
• The F LED turns on.
• The message LowPower is indicated on the top line of the LCD and the input voltage
is displayed on the bottom line of the LCD.
• The fail relay de-energizes.
NOTE: The low power alarm cannot be cleared using the ENTER button.
When the voltage increases to 10.7 volts, the low power alarm is cleared and the M2 will
begin its warm-up sequence.
Responding to a Low Power Condition
1. Determine and correct the cause of the low power condition.
2. When the input power increases above 10.7 volts, the M2 will begin its warm-up
sequence.
3. Verify that the M2 enters normal operation after its warm-up sequence. If necessary,
perform a fresh air adjustment. See “Adjusting the Fresh Air Reading” on page 11.