RKI Instruments 65-2422RK-05 User Manual
Page 10
6 • 65-2422RK-05 H
2
S Transmitter
If the H
2
S detector is mounted to the junction box, skip to step 5. If not, continue with
step 2.
NOTE: The H
2
S detector 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 ClassI, Groups B, C, and
D may be used.
2.
Remove the junction box cover.
3.
Guide the two wires that extend from the top of the H
2
S detector through the bottom
conduit hub of the junction box.
4.
Screw the H
2
S detector into the bottom conduit hub of the junction box.
5.
At the monitoring site, use #10 screws through the junction box’s two mounting holes
to secure the junction box to a vertical surface.
CAUTION:
Mount the H
2
S transmitter with the detector facing down (see Figure 2).
Wiring the H
2
S 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 at 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 TOXIC 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 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.
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 wire to the terminal labeled 4/20 FB.