29
•
Chapter 4: Operation
65-2646XL-05-04 M2A Transmitter Operator’s Manual
Fail Condition
Fail Condition Indications
The M2A 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 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 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 is not an active gas monitor.
When the M2A 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 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 will begin its warm-up sequence.
3. Verify that the M2A enters normal operation after its warm-up sequence. If necessary, perform
a fresh air adjustment. See “Adjusting the Fresh Air Reading” on page 23.
