4 • 65-2428 H
2
S Detector
2.
At the monitoring site, mount the detector in one of the following two ways:
•
Screw the detector’s 3/4” NPT mounting thread into an empty conduit hub on a
controller.
OR
•
Screw the detector’s 3/4” NPT mounting thread into an appropriately rated
junction box.
CAUTION:
Mount the H
2
S detector with the detector facing down (see Figure 2).
NOTE:
If the mounting site requires the detector installation to be explosion proof, you
must install the detector in a junction box with an internal volume less than or
equal to 69 cubic inches and rated explosion proof for Class I, Groups B, C, and
D.
Wiring the H
2
S Detector to a Controller
WARNING: Always verify that the power source is OFF before you make wiring
connections.
1.
Turn off the controller.
2.
Turn off or unplug power to the controller.
3.
If the detector is mounted remotely from a controller using an explosion proof
junction box, proceed to step 4.
If the detector is mounted directly to a controller, connect the detector’s red and black
wires to the appropriate controller detector terminals and skip to the Startup Section.
4.
Remove the junction box cover.
WARNING: To maintain the explosion proof classification of the H
2
S detector/junction
box combination, a conduit seal must be used within 18 inches of the
junction box conduit hub used for wiring to the controller.
5.
Guide a two-conductor, shielded cable or two wires in conduit through an unused
conduit hub of the junction box.
6.
Connect the two wires to the detector using an appropriate 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.
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.
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