M2A-XL Transmitter Operator’s Manual
Chapter 7: Maintenance
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4. If you are replacing a CO sensor, remove the rubber boot and charcoal filter from the old
sensor.
NOTE:
RKI instruments recommends replacing the charcoal disk filter whenever a
CO sensor is replaced.
If you are replacing the 65-2428 explosion-proof H
2
S detector’s sensor, remove the rubber
boot and spacer from the old sensor.
5. Remove the replacement sensor from its packaging and remove the wire jumper. This wire
jumper is installed on the sensor pins for shipment or storage but must be removed for the
sensor to operate properly when installed in a detector.
WARNING: The sensor will not operate properly if the wire jumper is not removed.
Figure 31: Plug-In Sensor Jumper Removal
6. If you are replacing a CO sensor, install the rubber boot and charcoal filter onto the new
sensor’s face.
If you are replacing the 65-2428 explosion-proof H
2
S detector’s sensor, install the rubber
boot and spacer on the new sensor’s face.
7. Carefully match the replacement sensor’s male pins with the 4-socket pattern in the top
section and plug it in.
8. Make sure the cap gasket is in place and screw the detector cap back onto the housing body.
9. Turn on or reconnect power to the M2A-XL.
CAUTION:
For all gases except ClO
2
, allow the replacement sensor to warm up for
15 minutes
before you continue with the next step.
For ClO
2
, allow the replacement sensor to warm up for 2-3 hours
before you continue with the next step.
10. Calibrate the detector as described in “Calibration, Combustible Gas, CO2, and Toxic
Remove jumper
