65-2443SS PPM Hydrogen Transmitter • 7
Amplifier
The amplifier converts the non-linear electrical output from the detector to a linear 4 to 20 mA signal
that corresponds to the detection range and transmits the signal to a gas monitoring controller. The
amplifier includes the terminal strips, span pot, linearizing 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 three 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 page 10 for all wiring
procedures related to the transmitter.
Span Pot
The span pot is located to the left of the detector terminal strip (see Figure 2). Use a small flat blade
screwdriver to turn the span pot’s adjustment screw and adjust the amplifier’s full scale response
output during the calibration procedure.
Linearizing Pot
The linearizing pot (labeled LINEAR) is located in the bottom left corner of the amplifier (see
Figure 2). Use a small flat blade screwdriver to turn the linearizing pot’s adjustment screw while
applying mid-scale gas to linearize the transmitter’s output during the calibration procedure.
+ Test Point, Red
R
B
W
DE
T
E
CT
OR
- Test Point, Black
Mounting Screw
w/ flat and lock washer
SPAN
P
W
R
/ S
IG
S
LI
N
E
A
R
Factory Use Jumpers
Detector Terminal Strip
Span Pot
Controller Terminal Strip
Linearizing Pot
