RKI Instruments 65-2498RK - Manual (Page 8)

65-2495RK/65-2498RK H
2
S Detector • 8
5. Guide a two-conductor, shielded cable or two wires in conduit through the unused
conduit hub of the junction box. Use appropriate conduit fittings and construction
technique for the environmental rating of the junction box. The junction box is rated
NEMA 4X.
6. Connect the two wires to the detector using the terminal block.
CAUTION: If using shielded cable, leave the 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 H
2
S 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 65-
2498RK detector.
Figure 4: Wiring the H
2
S Detector to a Controller
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.
11. Reinstall the junction box cover.
Shielded Cable
Red
H S Detector
Black
Terminal Strip
2
Controller Housing
Controller Detector Terminals,
Typical Designations
+
S