RKI Instruments 65-2516RK - Manual (Page 9)

65-2516RK Oxygen Transmitter • 5
NOTE: The oxygen detector used in this transmitter is normally provided with a Killark
HKB junction box and an HFC lid rated explosion proof for Class I, Groups B, C,
and D. This combination is shown in Figure 2 above. Any 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 may be used for this transmitter as long as the
amplifier will fit in it.
2. At the monitoring site, use #10 screws through the junction box’s two mounting holes
to secure the junction box to a vertical surface.
Wiring the Oxygen Transmitter 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 incoming power to the controller.
3. Remove the junction box cover.
4. Verify that the detector leads are wired to the amplifier’s detector terminal strip.
If necessary, connect the detector leads to the detector terminal strip as shown in
Figure 3.
5. Verify that the jumper block is installed over the Oxygen selector of the amplifier type
selector as shown in Figure 3.
6. Guide a two-conductor, shielded cable or two wires in conduit through the top
conduit hub of the junction box.
WARNING: To maintain the explosion proof classification of the oxygen 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.
7. Connect the two wires to the interconnect terminal strip as follows (see Figure 3).
• Connect the positive wire to the terminal labeled 24V +.
• Connect the feedback (or signal) wire to the terminal labeled 4/20 FB.
CAUTION: If using shielded cable, leave the drain wire insulated and disconnected at the
transmitter. You will connect the opposite end of the cable’s drain wire at the
controller.
8. Secure the junction box cover to the junction box.
9. Route the cable or wires leading from the oxygen 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.