RKI Instruments 61-0192RK - Manual (Page 13)

61-1006RK/61-0192RK Combustible Gas Detector • 9
Replacing the IR LEL 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 inside the junction box. Note
the position of the color-coded leads as you remove them.
5. Unscrew the detector from the junction box.
6. Guide the detector leads of the replacement detector through the bottom conduit hub
of the junction box, then screw the mounting threads of the detector into the conduit
hub.
7. Connect the detector leads to the terminal block in the same position as the leads you
removed in step 4.
8. Secure the junction box cover to the junction box.
9. Turn on power to the controller.
10. Turn on the controller.
11. Calibrate the replacement detector as described in “Calibration” on page 9.
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 combustible
detector applications. Unless experience in a particular application dictates otherwise,
RKI Instruments, Inc. recommends a calibration frequency of every 6 months for the
infrared combustible detector.
If an application is not very demanding, for example detection in a clean, temperature
controlled environment where the combustible target gas 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,
then more frequent calibration than every 6 months may be necessary.
Calibration
This section describes how to calibrate the combustible gas detector. It includes
procedures to prepare for calibration, set the zero reading, set the response reading and
return to normal operation.
WARNING: The controller is not an active gas monitoring device during the calibration
procedure.
NOTE: The following procedure assumes the use of a calibration kit which includes a
calibration gas cylinder, a 0.5 LPM fixed flow regulator with an on/off knob, a
calibration cup for the detector, and a short piece of sample tubing to connect the
regulator to the calibration cup.