65-2661RK-03-04 M2A Transmitter Operator’s Manual
36
Replacing the Plug-In CO
2
Sensor
CAUTION: The plug-in sensor contains electrolyte which is a dilute acid. Do not disassemble the
sensor when replacing it with a new one. If sensor electrolyte comes in contact with
your skin, wash affected area thoroughly with soap and water.
1.
Turn off or disconnect power to the M2A.
2.
Unscrew the calibration adapter/splash guard from the detector.
3.
Unscrew the detector housing cap from the detector housing body. Make sure not to
lose the cap gasket.
4.
Unplug and remove the plug-in IR CO
2
sensor.
5.
Carefully plug the replacement sensor into the socket pattern that is located in the
detector housing.
6.
Make sure the cap gasket is in place and screw the detector housing cap back onto the
detector housing body.
7.
Screw the calibration adapter/splash guard back onto the detector.
8.
Turn on power to the controller.
9.
Turn on the controller and place it into normal operation.
CAUTION:
Allow the replacement sensor to warm up for 5 minutes before you continue with the
next step.
10. Calibrate the detector as described in “Calibration” on page 33.
Replacing the IR CO
2
Detector
NOTE:
In most cases it is only necessary to replace the IR CO
2
plug-in sensor.
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 Figure 7 on page 13).
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.
