RKI Instruments 61-1000RK-05 - Manual (Page 8)

4 • 61-1000RK-05 Combustible Gas Detector
2. At the mounting site you select, hang or mount the junction box with the detector
facing down (see Figure 2).
Wiring the Combustible Gas Detector to a Controller
WARNING: Always verify that the power to the controller is off before you make
wiring connections.
1. Turn off the controller.
2. Turn off power to the controller.
3. If the detector is mounted remotely from a controller using the junction box, proceed
to step 4.
If the detector is mounted directly to a controller, it is normally factory wired. Confirm
that the detector’s wires are connected to the appropriate controller detector terminals
and skip to “Start Up” on page 6. See Figure 3, the controller operator’s manual, and
the controller’s detector head specification sheet for the 61-0140RK-05 detector for the
wiring connections.
4. Remove the junction box cover.
5. Guide a four-conductor, shielded cable or four wires in conduit through the unused
conduit hub of the junction box. Use appropriate conduit fittings and construction
technique for the environmental rating and hazardous location classification of the
junction box. The junction box is rated NEMA 4X and classified explosion proof for
Class I, Groups B, C, and D.
6. Connect the detector leads to the terminal block in the junction box.
WARNING: To maintain the explosion proof classification of the LEL detector/junction
box combination, a conduit seal must be used at the junction box conduit
hub used for wiring to the controller.
CAUTION: Leave the shield drain wire insulated and disconnected at the detector. You will
connect the opposite end of the cable’s drain wire at the controller.
7. Secure the junction box cover to the junction box.
8. Route the cable or wires leading from the combustible gas detector through one of the
conduit hubs at the controller housing. Use appropriate conduit fittings and
construction technique for the environmental rating of the controller. RKI controllers
are typically rated NEMA 4X.
CAUTION: Do not route power and detector wiring through the same conduit hub. The power
cable may disrupt the transmission of the detector signal to the controller.
9. Connect the wires to the applicable controller terminal strip. See the controller
operator’s manual and the controller’s detector head specification sheet for the
61-1000RK-05 detector.
10. If using shielded cable, connect the cable’s drain wire to an available chassis ground at
the controller. RKI controllers typically have a ground stud that is a convenient
grounding location.