Operator`s manual

47 M2 Transmitter Operator’s Manual
• Oxygen gas detector.
Green wire to terminal labeled OXY +, white wire to terminal labeled OXY -.
11. Re-install the detector terminal strip into its socket.
12. Re-install the control PCB (and ribbon cable if necessary). Be sure the ribbon cable is
routed down below the control PCB so it will not be damaged by the cover when it is
screwed back on.
13. Secure the junction box cover to the junction box.
14. Turn on or reconnect power to the M2.
NOTE: Allow the replacement detector to warm up for 15 minutes before you continue
with the next step.
15. Calibrate the replacement detector as described in “Calibration, Combustible Gas,
CO2, and Toxic Versions” on page 40 or “Calibration, Oxygen Version” on page 43.
Replacing the CO or H
2
S Plug-in Sensor
NOTE: This procedure is applicable for both the CSA type, explosion proof CO and
H
2
S detectors and the non-explosion proof CO and H
2
S detectors.
1. Turn off or disconnect power to the M2.
2. Unscrew the detector cap from the housing body. Make sure not to lose the cap gasket.
See Figure 4 - Figure 7 for illustrations of the CO or H
2
S detectors.
3. Unplug and remove the sensor.
NOTE: The CO sensor has a charcoal disk filter held onto it by a rubber retaining boot.
When replacing a CO sensor, remove this filter and boot from the old sensor.
RKI instruments recommends replacing the charcoal disk filter whenever a CO
sensor is replaced. Re-install the charcoal disk filter and retaining boot before
continuing.
4. Carefully match the replacement sensor’s male pins with the 4-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 onto the housing
body.
6. Turn on or reconnect power to the M2.
CAUTION: 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 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.