RKI Instruments 65-2451RK - Manual (Page 8)

4 • 65-2451RK Hydrogen Transmitter
controller. Use the cover on the front of the junction box to access the interior of the
junction box. The detector and amplifier are factory installed in the junction box. Three
spacers installed on the back of the junction box control the distance of the junction box
from a mounting surface and ensure that there is enough room to install a calibration cup
on the detector during calibration.
Installation
This section describes procedures to mount the hydrogen transmitter in the monitoring
environment and wire the transmitter to a controller.
Mounting the Hydrogen 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. Make
sure there is sufficient room to perform start-up, maintenance, and calibration
procedures.
• Select a site where the target gas is likely to be found first. For hydrogen, which is
lighter than air, mount the transmitter near the ceiling or where hydrogen is most
likely to accumulate.
Figure 2: Mounting the Hydrogen Transmitter
Rubber
Spacers,
3X
.75
2.70 .38
3.65
3/4 NPT Female
J Box
3/4 x 1/2 Reducing
Bushing
Hydrogen
Detector
7.5 max