28 • 65-2482RK Multi Point Detector
detector housing.
6.
Make sure the cap gasket is in place and screw the detector housing cap onto the
detector housing body.
7.
Turn on or plug in power to the controller.
8.
Turn on the controller.
CAUTION:
Allow the replacement sensor to warm up for 5 minutes before you continue with the
next step.
9.
Calibrate the detector as described in “Calibration, LEL, H
2
S, and CO Detectors” on
page 29.
Replacing the H
2
S Detector
NOTE:
In most cases, it is only necessary to replace the H
2
S sensor.
1.
Turn off the controller.
2.
Turn off or unplug 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 H
2
S 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.
Calibration Frequency
Although there is no particular calibration frequency that is correct for all applications, a
calibration frequency of every 3 months is adequate for most multi-point detector
applications. Unless experience in a particular application dictates otherwise, RKI
Instruments, Inc. recommends a calibration frequency of every 3 months for the oxygen,
