8 • 65-2340RK Toxic Gas Transmitter
produces an electrical output that corresponds to the detection range of the sensor.
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 detector terminal strip, controller terminal strip, zero
pot, span pot, and test points (see Figure 3).
Figure 3: Amplifier Component Location
Controller Terminal Strip
The controller terminal strip is a two position plug-in style terminal strip located at the top
edge of the amplifier. Use the controller terminal strip to wire the 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. Two of the positions are for use with an oxygen sensor and are not
used in the toxic gas transmitter. Use the two detector terminal strip positions that are labelled
“TOXIC” to connect the detector to the amplifier.
NOTE:
The detector is factory-wired to the detector terminal strip. See “Wiring the Toxic Gas
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 zero (fresh
air) 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.
Controller Terminal Strip
Detector Terminal Strip
Mounting Screw
SI
G
/P
W
R
SP
A
N
Span Pot
Factory Adjust Pot
Zero Pot
ZE
R
O
Red + Test Point
Black - Test Point
S
T
O
X
IC
O
X
Y
