RKI Instruments M2A - Sensor and Filter Replacements; Replacing the CO Sensor Charcoal Filter; Replacing an Oxygen Plug-in Sensor

58 M2A Transmitter Operator’s Manual
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.
CAUTION: Allow the replacement sensor to warm up for 15 minutes before you continue with the next step.
10. Calibrate the detector as described in “Calibration, Combustible Gas, CO2, and Toxic Versions” on page 50.
Replacing the CO Sensor Charcoal Filter
The charcoal filter is used to scrub out interfering gases from the environment being monitored, such as H
2
S and
certain hydrocarbons. If you are experiencing unexplained upscale readings on a CO M2A, the charcoal filter
may be saturated and no longer scrubbing out interfering gases and it may be necessary to change the charcoal
filter.
1. Turn off or disconnect power to the M2A.
2. Unscrew the detector housing cap from the housing body. Make sure not to lose the cap gasket. See Figure 6
for an illustration of the CO detector.
3. Remove the rubber retaining boot with the charcoal filter disk from the sensor.
4. Replace the charcoal filter disk in the rubber retaining boot and install the boot onto the sensor.
5. Make sure that the cap gasket is in place and screw the detector cap back onto the housing body.
6. Turn on or reconnect power to the M2A.
Replacing an Oxygen Plug-in Sensor
NOTE: This procedure is applicable for both the CSA type, explosion proof oxygen detector (65-2514RK)
and non-explosion proof, replaceable sensor oxygen detector (65-2494RK).
1. Turn off or disconnect power to the M2A.
2. Unscrew the detector cap from the detector housing body. Take care not to lose the cap gasket. See Figure 4
for an illustration of the oxygen detectors.
3. Unplug and remove the sensor.
Remove jumper
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