10 • 65-2428 H
2
S Detector
5.
Unscrew the detector from the controller conduit hub or junction box hub.
6.
Guide the detector leads of the replacement detector through the controller conduit
hub or junction box hub then screw the mounting threads of the detector into the hub.
7.
If the detector is installed directly on a controller, connect the detector leads to the
appropriate detector terminal strip terminals. See the controller operator’s manual
and the controller’s detector head specification sheet for the H
2
S detector.
If the detector is installed remotely from a controller in a junction box, 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.
8.
If the detector is installed remotely from a controller in a junction box, 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” on page 11.
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 H
2
S transmitter applications.
Unless experience in a particular application dictates otherwise, RKI Instruments, Inc.
recommends a calibration frequency of every 3 months for the H
2
S transmitter.
If an application is not very demanding, for example detection in a clean, temperature
controlled environment, and calibration adjustments are minimal at calibration, then a
calibration frequency of every 6 months is adequate.
If an application is very demanding, for example if the environment is not well controlled,
then more frequent calibration than every 3 months may be necessary.
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