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65-2645RK-05-04 M2A Transmitter Operator’s Manual
4. Unplug and remove the H
2
S sensor with the rubber boot and spacer attached.
5. Remove the rubber boot and spacer from the old sensor.
6. 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.
WARNING:
The sensor will not operate properly if the wire jumper is not removed.
Figure 10: Plug-In Sensor Jumper Removal
7. Install the rubber boot and spacer onto the new sensor’s face.
8. Carefully plug the replacement sensor into the four-socket pattern that is located in the detector housing.
9. Make sure the cap gasket is in place and screw the detector housing cap back onto the detector housing body.
10. Screw the calibration adapter/splash guard back onto the detector housing cap.
11. Turn on or plug in power to the M2A.
CAUTION:
Allow the replacement sensor to warm up for 5 minutes
before you continue with the next step.
12. Calibrate the transmitter as described in the “Calibration” on page 35.
Replacing the H
2
S Detector
NOTE:
In most cases, it is only necessary to replace the plug-in H
2
S sensor.
1. Turn off or unplug power to the M2A.
2. Remove the detector junction box cover.
3. Unscrew the calibration adapter/splash guard from the detector housing cap.
4. Disconnect the detector leads from the terminal block in the detector junction box. Note the position of the
color-coded leads as you remove them.
5. Unscrew the detector from the detector junction box.
6. Guide the detector leads of the replacement detector through the bottom conduit hub of the detector junction
box, then screw the mounting threads of the detector into the conduit hub. If necessary for environmental
conditions, apply thread sealant or Teflon tape to the hub and/or detector threads to seal them.
7. Connect the detector leads to the terminal block the same way the old detector was wired (see Figure 8 on
8. Screw the calibration adapter/splash guard onto the new detector housing cap.
9. Reinstall the detector junction box cover.
10. Turn on or plug in power to the M2A.
Remove jumper
