RKI Instruments 65-2390RK - Manual (Page 9)

65-2390RK Combustible Gas Transmitter • 5
CAUTION: Mount the combustible gas transmitter with the detector facing down (see Figure 2.)
Wiring the Combustible Gas Transmitter to a Controller
WARNING: Always verify that the power to the controller is off before you make
wiring connections.
1. Turn off power to the controller.
2. Place the controller’s power switch in the OFF position.
3. Remove the junction box cover.
4. Verify that the detector leads are wired to the amplifier’s interconnect terminal strip.
If necessary, connect the detector leads to the interconnect terminal strip as shown in
Figure 3.
5. Guide a three-conductor, shielded cable or three wires in conduit through the top
conduit hub of the junction box.
6. Connect the three wires to the interconnect terminal strip as follows (see Figure 3).
• Connect the positive wire to the 24V DC terminal.
• Connect the feedback wire to the 4-20 (FB) terminal.
• Connect the negative wire to the GND (DC -) terminal.
CAUTION: If shielded cable is used, leave the cable shield’s drain wire insulated and
disconnected at the transmitter. You will connect the opposite end of the cable’s drain
wire at the controller to chassis ground.
7. Secure the junction box cover to the junction box.
8. 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 conduit hub. The
power cable may disrupt the transmission of the transmitter signal to the
controller.
9. Connect the wires to the applicable transmitter terminal strip at the controller as
shown in Figure 3 below.