24 • 65-2482RK Multi Point Detector
Replacing Components of the Multi-Point Detector
This section includes maintenance procedures for the IR LEL CH
4
detector, the oxygen
detector, the CO detector, and the H
2
S detector.
Replacing the IR LEL CH
4
Detector
1.
Turn off the controller.
2.
Turn off or unplug incoming power to the controller.
3.
Remove the junction box cover.
4.
Disconnect the detector leads from the terminal block in the junction box. Note the
position of the color-coded leads as you remove them.
5.
Unscrew the detector from the junction box hub.
6.
Guide the detector leads of the replacement detector through the junction box hub
then screw the mounting threads of the detector into the 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 the controller operator’s manual and the controller’s detector head
specification sheet for the IR LEL detector to verify the connections are correct. Also
see Figure 11-Figure 16 for wiring diagrams.
8.
Reinstall the junction box cover.
9.
Turn on or plug in power to the controller.
10. Turn on the controller.
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, LEL, H
2
S, and CO
Detectors” on page 29.
Oxygen Detector
This section contains instructions to replace the plug-in oxygen sensor and to replace the
entire detector assembly. In most cases it is not necessary to replace the entire detector
assembly.
Replacing the Plug-In Oxygen Sensor
CAUTION: The plug-in sensor contains electrolyte that is an irritant. Do not disassemble the
sensor when replacing it with a new one. If electrolyte comes in contact with your
skin, wash affected area thoroughly with soap and water.
1.
Turn off the controller.
2.
Turn off or unplug power to the controller.
3.
Unscrew the detector housing cap from the detector housing body. Make sure not to
lose the cap gasket.
4.
Unplug and remove the oxygen sensor.
5.
Carefully plug the replacement sensor into the socket pattern that is located in the
