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65-2666RK-04 M2A Transmitter Operator’s Manual
Replacing the Hydrophobic Membrane
1. Turn off or unplug power to the M2A.
2. Unscrew the detector housing cap from the detector housing body.
3. Gently pry up the edge of the white hydrophobic membrane with a small flat blade screwdriver or a similar
tool.
4. Peel off the hydrophobic membrane. It may be necessary to clean off the detector housing cap face to
remove any residue left from the adhesive backed membrane.
5. Install the new membrane in the recess on the face of the detector housing cap.
6. Make sure the cap gasket is in place and screw the detector housing cap back onto the detector housing body.
7. Turn on or plug in power to the M2A.
Replacing the Oxygen Detector
NOTE:
In most cases, it is only necessary to replace the plug-in oxygen 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.
CAUTION:
Allow the replacement detector to warm up for 5 minutes
before you continue with the next step.
11. Calibrate the replacement detector as described in “Calibration” on page 35.
