65-2462RK Hydrogen Transmitter • 7
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 sensor
voltage is factory set to 2.0V between the red and black wires. The amplifier includes the detector
terminal strip, controller terminal strip, span pot, zero pot, and test points.
Figure 2: 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 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 detector to the amplifier.
NOTE:
The detector is factory-wired to the detector terminal strip. See pg. 10 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 2). 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.
Span Pot
The span pot is located to the right of the zero pot (see Figure 2). 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.
LE
L
PW
R /
SI
G
B
S
G
W
R
Mounting Screw
Detector Terminal Strip
Controller Terminal Strip
Zero Pot
Jumper Pins,
Factory Use Only
Red + Test Point
SP
A
N
ZER
O
Black - Test Point
Factory Adjust Pots
Span Pot
