8 • 65-2331-04 H
2
S Transmitter
Wiring the Detector to the Amplifier
WARNING: Always verify that power to the controller is OFF before you make wiring
connections.
1.
Confirm that no power is being applied to the amplifier. If the amplifier has already
been connected to a controller, turn off the controller and turn off or unplug power to
the controller.
2.
Remove the detector junction box’s cover from the junction box.
3.
Remove the amplifier junction box’s cover from the junction box.
4.
Guide a two-conductor, shielded cable or two wires in conduit through the top
conduit hub of the detector junction box. To make wiring more convenient, use wire
colors that correspond to the detector wire colors: red and black.
NOTE:
Consult RKI Instruments, Inc. for cable lengths longer than 200 feet.
5.
Connect the detector leads to the terminal block in the detector junction box.
CAUTION:
If shielded cable is used, leave the cable shield’s drain wire disconnected and
insulated at the detector junction box. You will connect the opposite end of the cable’s
drain wire to the amplifier junction box’s chassis (earth) ground.
6.
Secure the detector junction box’s cover to the junction box.
7.
Guide the other end of the two-conductor, shielded cable or two wires in conduit
through the bottom conduit hub of the amplifier junction box.
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
detector junction box conduit hub used for wiring to the amplifier.
8.
To gain access to a plug-in terminal strip for wiring, pull it out of its socket by
grasping the terminal strip and pulling. The detector strip is keyed so that the
controller and detector terminal strips cannot be reversed inadvertently.
9.
Pull out the detector terminal strip and connect the two wires to the terminal strip as
follows (see Figure 6).
•
Connect the wire corresponding to the detector’s red wire to the TOXIC “+”
terminal.
•
Connect the wire corresponding to the detector’s black wire to the TOXIC “-”
terminal.
