RKI Instruments 61-0191RK - Manual (Page 14)

10 • 61-1004RK/61-0191RK Carbon Dioxide Detector
Replacing the CO
2
Detector
1. Turn off the controller.
2. Turn off power to the controller.
3. If the detector is installed directly on a controller, open the controller door.
If the detector is installed remotely from a controller in a junction box, remove the
junction box cover.
4. If the detector is installed directly on a controller, disconnect the detector leads from
the detector terminal strip in the controller. Note the position of the color-coded leads
as you remove them.
If the detector is installed remotely from a controller in a junction box, 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. If the detector is installed directly on a controller, connect the detector leads to the
appropriate detector terminal strip terminals. See Figure 3 on page 6 for wiring to a
generic controller. See the controller operator’s manual and the controller’s detector
head specification sheet for the 61-0191RK detector for wiring specific to your
controller.
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
Figure 3 on page 6). See the controller operator’s manual and the controller’s detector
head specification sheet for the 61-1004RK detector to verify the connections to the
controller are correct.
8. If the detector is installed remotely from a controller in a junction box, reinstall the
junction box cover.
9. Turn on power to the controller.
10. Turn on the controller.
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 6 months is adequate for most infrared CO
2
detector
applications. Unless experience in a particular application dictates otherwise, RKI
Instruments, Inc. recommends a calibration frequency of every 6 months for the infrared
CO
2
detector.
If an application is not very demanding, for example detection in a clean, temperature
controlled environment where CO
2
is not normally present, and calibration adjustments
are minimal at calibration, then a calibration frequency of every 9 to 12 months is
adequate.
If an application is very demanding, for example if the environment is not well controlled,