RKI Instruments 65-2391RK - Manual (Page 8)

4 • 65-2391RK CO
2
Transmitter
Junction Box
Use the junction box to install the CO
2
transmitter at a mounting site that is remote from
the controller. The junction box also protects the amplifier and wiring connections made
to the amplifier. Use the two 3/4 in. conduit hubs to mount the detector to the junction
box (bottom hub) and connect wiring from the amplifier to the controller (top hub).
NOTE: The detector and amplifier are factory-mounted to the junction box.
Use the junction box’s two mounting holes to mount the CO
2
transmitter to a vertical
surface at the monitoring site. Use the cover on the front of the junction box to access the
interior of the junction box.
Installation
This section describes procedures to mount the CO
2
transmitter in the monitoring
environment and wire the transmitter to a controller.
Mounting the CO
2
Transmitter
1. Select a mounting site that is representative of the monitoring environment. Consider
the following when you select the mounting site.
• Select a site where the transmitter is not likely to be bumped or disturbed.
• Select a site where there is sufficient room to perform start-up, maintenance, and
calibration procedures.
• Mount the transmitter at least six feet from the floor to minimize the possibility of
someone breathing on the unit. The exhaled CO
2
may cause an alarm.
Figure 2: Mounting the CO
2
Transmitter
3.94
6.10
1.10
.25 Dia. Mounting
Hole, 2X
3/4 NPT Conduit
Hub
7.3 Max
2.75
5.20
3/4 NPT For
Calibration Cup
1.9
Max
5.46
NOTE: All Dimensions in Inches