8 • 65-2397SS CO
2
Transmitter
Amplifier
The amplifier converts the electrical output from the detector to a 4 to 20 mA signal that corresponds
to the detection range and transmits the signal to a gas monitoring controller. A foam gasket that
orients the amplifier and keeps it from rotating is installed on the bottom of the amplifier. The
amplifier includes the controller terminal strip, detector terminal strip, span pot, zero pot, and test
points (see Figure 3).
Figure 3: Amplifier Component Location
Controller Terminal Strip
The controller terminal strip is a three position plug-in style terminal strip located near the top of the
amplifier. Use the controller terminal strip to wire the CO
2
transmitter to a controller.
Detector Terminal Strip
The detector terminal strip is a four position plug-in style terminal strip located below the controller
terminal strip. Use the detector terminal strip to connect the CO
2
transmitter to the amplifier.
NOTE:
The IR CO
2
detector is factory-wired to the detector terminal strip. See “Wiring the CO
Transmitter to a Controller” on page 11 for all wiring procedures related to the transmitter.
Zero Pot
The zero pot is located in the upper left corner of the amplifier (see Figure 3). Use a small flat blade
screwdriver to turn the zero pot’s adjustment screw and adjust the amplifier’s target gas-free output
during the start-up and calibration procedures. Turn the adjustment screw clockwise to increase the
zero output and counterclockwise to decrease the zero output.
W
B
LE
L
G
PW
R
/
S
IG
S
Jumper Pins,
Factory Use Only
Zero Pot
Span Pot
Detector Terminal
Strip
Factory Adjust Pot
Controller Terminal Strip
SP
A
N
- Test Point
S
e
ns
or
C
u
rre
n
t
m
A
ZE
R
O
R
+ Test Point
