8 • 65-2322RK Oxygen Transmitter
the detection range of the 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, zero
pot, span pot, and test points (see Figure 1).
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 amplifier 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 a toxic gas detector and are not
used in the oxygen transmitter. Use the two detector terminal strip positions that are labelled
“OXY” to connect the detector to the amplifier.
NOTE:
The detector is factory-wired to the detector terminal strip. See “Wiring the Oxygen
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 1). Use a small flat
blade screwdriver to turn the zero pot’s adjustment screw and adjust the amplifier’s zero
(oxygen free) output during the calibration procedure. 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 1). Use a small flat blade
screwdriver to turn the span pot’s adjustment screw and adjust the amplifier’s fresh air output
during the start up and calibration procedure. Turn the adjustment screw clockwise to increase
the fresh air output and counterclockwise to decrease the fresh air output.
CAUTION:
The amplifier includes an additional potentiometer. It is factory-set. Do not
adjust it.
Test Points
The test points are on the left side of the amplifier (see Figure 1). The test points produce a
100 mV to 500 mV output that corresponds to the transmitter’s 4 to 20 mA output. Use the test
points and a voltmeter to measure the amplifier’s output during the start-up and calibration
procedures. The black test point in the lower left corner is the negative (-) test point and the
red test point below the zero pot is the positive (+) test point.
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