8 • 65-2396RK CO
2
Transmitter
CAUTION:
The amplifier includes two additional potentiometers. They are factory-set. Do not adjust
them.
Test Points
The test points are on the left side of the amplifier (see Figure 1). The test points produce a 100 mV to
500 mV output that corresponds to the transmitter’s 4 to 20 mA output. Use the test points and a
voltmeter to measure the amplifier’s output during the start-up and calibration procedures. The black
test point in the lower left corner is the negative (-) test point and the red test point below the zero pot
is the positive (+) test point.
Junction Box
Use the junction box to install the transmitter at a mounting site that is remote from the controller. The
junction box protects the amplifier and wiring connections made to the amplifier. Use the top 3/4 NPT
conduit hub to connect wiring from the amplifier to the 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 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. Make sure 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.
