RKI Instruments 65-2485RK-02 - Manual (Page 19)

65-2485RK-02 Multi Point Detector • 15
5. Unscrew the detector from the junction box hub.
6. Guide the detector leads of the replacement detector through the junction box 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 the controller operator’s manual and the controller’s detector head
specification sheet to verify the connections are correct. Also see Figure 5 for a wiring
diagram.
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, H
2
S and CO
Detectors” on page 17.
H
2
S Detector
This section includes a procedure to replace the H
2
S sensor and one to replace the entire
detector assembly. In most cases it is not necessary to replace the entire detector assembly.
Replacing the Plug-In H
2
S Sensor
CAUTION: The sensor contains electrolyte which is a dilute acid. Do not disassemble the sensor
when replacing it with a new one. If sensor electrolyte comes in contact with your
skin, wash affected area thoroughly with soap and water.
1. Turn off the controller.
2. Turn off or unplug power to the controller.
3. Unscrew the detector housing cap from the detector housing body. Make sure not to
lose the cap gasket.
4. Unplug and remove the H
2
S sensor with the rubber boot and spacer attached.
5. Remove the rubber boot and spacer from the old sensor.
6. Install the spacer and rubber boot onto the replacement sensor’s face.
7. Carefully plug the replacement sensor into the socket pattern that is located in the
detector housing.
8. Make sure the cap gasket is in place and screw the detector housing cap onto the
detector housing body.
9. Turn on or plug in power to the controller.
10. Turn on the controller.
CAUTION: Allow the replacement sensor to warm up for 5 minutes before you continue with the
next step.