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Chapter 4: Operation
65-2662XL-04 M2A-XL Transmitter
Fail Condition
Fail Condition Indications
The M2A-XL 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 M2A-XL 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
1. Verify that the detector wiring is correctly and securely connected.
Low Power Alarm
Low Power Alarm Indications
The M2A-XL senses a low power condition when the DC power source is 9.5 volts or less.
WARNING: While in a low power condition, the M2A-XL is not an active gas monitor.
When the M2A-XL 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 OLED display and the input
voltage is displayed on the bottom line of the OLED display.
• The fail relay de-energizes.
NOTE:
The low power alarm cannot be cleared using the ENTER button.
When the voltage increases to 10.0 volts, the low power alarm is cleared and the M2A-XL 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 10.0 volts, the M2A-XL will begin its warm-up
sequence.
3. Verify that the M2A-XL enters normal operation after its warm-up sequence. If necessary,
perform a fresh air adjustment. See “Adjusting the Fresh Air Reading” on page 24.
