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M2A Transmitter Operator’s Manual
Chapter 7: Maintenance
Overview
This chapter describes procedures for performing preventive maintenance, troubleshooting, calibrating the M2A,
and replacing field replaceable parts. It includes separate procedures for calibrating the combustible gas/CO
2
/
toxic and oxygen versions of the M2A.
Preventive Maintenance
This section describes a recommended preventive maintenance schedule to ensure the optimum performance of
the M2A. It includes daily, quarterly, and biannual procedures.
Daily
Verify a display reading of zero (20.9% for an oxygen M2A). Investigate significant changes in the reading.
Quarterly
Calibrate M2As that do not have an IR detector as described in “Calibration, Combustible Gas, CO2, and Toxic
Versions” on page 50 or “Calibration, Oxygen Version” on page 54. See “Calibration Frequency” on page 50 for
a discussion of calibration frequency guidelines.
Biannually
Calibrate M2As that have an IR detector as described in “Calibration, Combustible Gas, CO2, and Toxic
Versions” on page 50. See “Calibration Frequency” on page 50 for a discussion of calibration frequency
guidelines.
Troubleshooting
The troubleshooting guide describes symptoms, probable causes, and recommended action for problems you
may encounter with the M2A.
NOTE:
This troubleshooting guide describes M2A problems only. If the M2A is connected to a controller,
see the controller operator’s manual for problems you may encounter with the controller.
Table 14:Troubleshooting the M2A
Condition
Symptom(s)
Probable Causes
Recommended Action
No Power
The display backlight is
off and the display screen
is blank.
•
The power wiring is
disconnected or
misconnected.
•
The display cable is
disconnected or
misconnected.
1. Verify that the wiring to the power source or
controller is correct and secure.
2. Verify that the ribbon cable connecting the terminal
PCB to the control PCB is securely installed. This
ribbon cable plugs into a connector on the top edge
of the control PCB and on the bottom of the
terminal PCB.
3. If the power difficulties continue, contact RKI for
further instruction.
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