61-1001RKSS Hydrogen Detector • 9
Replacing the Hydrogen Detector
1.
Turn off the controller.
2.
Turn off 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 controller conduit hub or junction box conduit hub.
6.
Guide the detector leads of the replacement detector through the controller conduit
hub or junction box conduit 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 Figure 3). See the controller operator’s manual and the controller’s detector
head specification sheet for the 61-1001RKSS detector to verify the connections to the
controller are correct.
8.
Reinstall the junction box cover.
9.
Turn on or plug in power to the controller.
10. Turn on the controller and place into normal operation.
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 the Calibration section of this
manual.
Calibration Frequency
Although there is no particular calibration frequency that is correct for all applications, a
calibration frequency of every 3 to 6 months is adequate for most hydrogen detector
applications. Unless experience in a particular application dictates otherwise, RKI
Instruments, Inc. recommends a calibration frequency of every 3 months.
If an application is not very demanding, for example detection in a clean, temperature
controlled environment where hydrogen is not normally present 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 hydrogen is present often and in
significant concentrations or the environment is not well controlled, then more frequent
calibration than every 3 months may be necessary. If potential catalyst poisons are known
or likely to be present, more frequent calibration than every 3 months will be necessary.