65-2649RK-CH4-4 M2A Transmitter Operator’s Manual
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Chapter 7: Maintenance
Overview
This chapter describes procedures for performing preventive maintenance, troubleshooting, calibrating the M2A,
and replacing field replaceable parts.
Preventive Maintenance
This section describes a recommended preventive maintenance schedule to ensure the optimum performance of
the M2A. It includes daily and biannual procedures.
Daily
Verify a display reading of 0% LEL. Investigate significant changes in the reading.
Biannually
Calibrate the M2A as described in “Calibration” on page 36. See “Calibration Frequency” on page 35 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 7: Troubleshooting the IR LEL Detector
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.
