RKI Instruments 65-2398RK - Manual (Page 17)

65-2398RK Combustible Gas Transmitter • 13
NOTE: When first powered up, the transmitter will enter about a one minute period
when the 4-20 mA output is stabilizing and may be above the controller alarm
points or well below zero momentarily. RKI controllers have a one minute
warmup period when the controller does not display any gas reading or give any
alarm indication. The combustible gas transmitter’s 4-20 mA signal should be
stable by the time the controller’s warmup period is over.
CAUTION: Allow the replacement sensor to warm up for 5 minutes before you continue with the
next step.
9. Calibrate the transmitter as described in “Calibration” on page 15.
Replacing the IR LEL Detector
1. Turn off the controller.
2. Turn off or unplug power to the controller.
3. Remove the junction box cover.
4. Remove the detector terminal strip from its socket.
5. Disconnect the detector leads from the detector terminal strip. Note the position of the
color-coded leads as you remove them.
6. Unscrew the detector from the junction box.
7. 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. If necessary for environmental conditions, apply thread sealant or teflon tape to
the hub and/or detector threads to seal them.
8. Connect the detector leads to the detector terminal strip as shown in Table 3 below
and Figure 4 on page 7 of this manual.
9. Reinstall the detector terminal strip into its socket.
10. Turn on or plug in power to the controller.
11. Turn on the controller and place it into normal operation.
Table 3:Reconnecting the Combustible Gas
Detector to the Amplifier
Detector Lead Detector Terminal Strip
Red LEL “R”
White LEL “W”
Green LEL “G”
Black LEL “B”