RKI Instruments M2A User Manual
Page 53
M2A Transmitter Operator’s Manual
48
coded leads as you remove them.
8.
Unscrew the detector from the junction box.
9.
Guide the replacement detector leads through the bottom conduit hub of the junction box, then
screw the mounting threads of the detector into the conduit hub.
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 Gas Detector
Color coded wire to terminal labeled TOXIC +, black wire to terminal labeled TOXIC -.
See Figure 25, “ESM-01 Toxic Detector Wiring” on page 21 for the wire color coding.
•
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 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 42 or “Calibration, Oxygen Version” on page 45.
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 M2A.
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.
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 65-2423RK-05 explosion-proof H
2
S detector’s sensor, remove the