M2A Transmitter Operator’s Manual
57
10. Connect the detector leads to the detector terminal strip as follows:
•
Catalytic Combustible Gas Detector, IR Combustible Gas Detector, and IR CO
2
Detector
Red wire to terminal labeled LEL RED, white to terminal labeled LEL WHT, green wire to terminal
labeled LEL GRN, black wire to terminal labeled LEL BLK.
•
CO or H2S Gas Detector
Red wire to terminal labeled TOXIC +, black wire to terminal labeled TOXIC -.
•
ESM-01 Toxic Gas Detector or CT-7 Series Toxic Gas Detector
Color coded wire to terminal labeled TOXIC +, black wire to terminal labeled TOXIC -. See Figure 28
on page 31 and Figure 29 on page 32 for the wire color coding.
•
Oxygen Gas Detector
White wire to terminal labeled OXY +, green 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 M2A.
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 50 or “Calibration, Oxygen Version” on page 54.
Replacing the CO, H
2
S, or CT-7 Series Plug-in Sensor
NOTE:
This procedure is applicable for: the CSA type, explosion proof CO and H
2
S detectors, the non-
explosion proof CO and H
2
S detectors, and the CT-7 Series detectors.
1. Turn off or disconnect power to the M2A.
2. Unscrew the detector cap from the housing body. Make sure not to lose the cap gasket. See Figure 5,
Figure 6, and Figure 8 for illustrations of the detectors.
3. Unplug and remove the sensor.
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.
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