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Chapter 7: Maintenance
65-2640XL-04 M2A Transmitter Operator’s Manual
Replacing the Combustible Gas Detector
1. Turn off or disconnect power to the M2A.
2. Remove the detector junction box cover.
3. Unscrew the calibration adapter/splash guard from the detector.
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
8. Screw the calibration adapter/splash guard onto the new detector.
9. Reinstall the detector junction box cover.
10. Turn on or plug in power to the M2A.
NOTE:
Allow the replacement detector to warm up for 15 minutes
before you
continue with the next step.
11. Calibrate the replacement detector as described in “Calibration” on page 40.
