12 • 65-2405RK-05-04 Combustible Gas Transmitter
Wiring the Amplifier 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 or unplug power to the controller.
3. Remove the amplifier junction box’s cover.
4. 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.
WARNING: To maintain the explosion proof classification of the 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 three-conductor, shielded cable or three wires in conduit through the top conduit hub of
the junction box.
6. Pull out the controller terminal strip, and connect the three wires to the terminal strip as follows
(see Figure 5).
•
Connect the positive wire to the
PWR/SI G “+”
terminal.
•
Connect the signal wire to the
PWR/SIG “
S”
terminal.
•
Connect the negative wire to the
PWR/SI G “-”
terminal.
CAUTION:
If shielded cable is used, leave the cable shield’s drain wire disconnected and insulated at
the transmitter. You will connect the opposite end of the cable’s drain wire to the
controller’s chassis (earth) ground.
7. Reinstall the controller terminal strip into its socket.
8. Secure the junction box cover to the junction box.
9. Route the cable or wires leading from the combustible gas transmitter through one of the conduit
hubs at the controller housing.
CAUTION:
Do not route power and transmitter wiring through the same controller conduit hub. The
power cable may disrupt the transmission of the transmitter signal to the controller.
10. Connect the wires to the applicable detector/transmitter terminal strip at the controller as shown in
