RKI Instruments M2 Series - Manual (Page 53)

M2 Transmitter Operator’s Manual 48
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 M2, 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 M2.
2. Unscrew the detector housing cap from the housing body. Make sure not to lose the
cap gasket. See Figure 4 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 M2.
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 M2.
2. Unscrew the detector cap from the detector housing body. Take care not to lose the cap
gasket. See Figure 2 or Figure 3 for an illustration of the oxygen detector.
3. Unplug and remove the sensor.
4. Carefully match the replacement sensor’s male pins with the 2-socket pattern in the
top section and plug it in.
5. Make sure the cap gasket is in place and screw the detector cap back on to the detector
housing.
6. Turn on or reconnect power to the M2.
NOTE: Allow the replacement sensor to warm up for 15 minutes before you continue
with the next step.
7. Calibrate the detector as described in “Calibration, Combustible Gas, CO2, and Toxic
Versions” on page 40.
Replacing an ESM-01 Plug-in Sensor
1. Turn off or disconnect power to the M2.
2. Unscrew the detector cap from the detector housing body. Take care not to lose the cap
gasket. If the splashguard begins to unscrew from the detector cap, make sure to
remove the detector cap also. See Figure 8 for an illustration of the ESM-01 detector.
3. Unplug and remove the sensor.
4. Carefully match the replacement sensor’s plug with the socket in the housing body
and plug it in.