8 • 65-2330RKSS H
2
S Transmitter
Amplifier
The amplifier converts the electrical output from the sensor 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, zero
pot, span pot, and test points.
Figure 3: Amplifier Component Location
Controller Terminal Strip
The interconnect 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 connect the amplifier to a controller.
Detector Terminal Strip
The detector terminal strip is a four-point plug-in style terminal strip near the bottom of the
amplifier. Use the detector terminal strip to connect the H
2
S detector to the amplifier.
NOTE:
The H
2
S detector is factory-wired to the detector terminal strip. See the Installation
section of this manual 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 (H
2
S
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.
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 response output
during the calibration procedure. Turn the adjustment screw clockwise to increase the output
and counterclockwise to decrease the output.
SPA
N
T
O
X
IC
O
X
Y
SI
G
/P
W
R
S
ZE
R
O
+ Test Point (Red)
100mV - 500mV
Range - Test Point (Black)
Zero Pot
Factory Adjust Pot
Span Pot
Controller Terminal Strip
Detector Terminal Strip
