65-2397SS CO
2
Transmitter • 9
Span Pot
The span pot is located to the right of the zero pot (see Figure 3). Use a small flat blade screwdriver to
turn the span pot’s adjustment screw and adjust the amplifier’s gas response output during the
calibration procedure. Turn the adjustment screw clockwise to increase the gas response and
counterclockwise to decrease the gas response.
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
The stainless steel, corrosion-resistant junction box allows you 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. An O-ring seals the interface between the junction box cover and the junction box base.
The detector and amplifier are factory installed in the junction box. Use the cover on the front of the
junction box to access the interior of the junction box. A locking set screw on the junction box cover
allows you to secure the junction box cover and prevent it from being removed.
