RKI Instruments 35-3001A-02 - Manual (Page 10)

6 • 35-3001A-02 Oxygen Sample-Draw Detector
zero output and counterclockwise to decrease the zero output.
Span Pot
The span pot is located below 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 pot. It is factory-set. Do not adjust it.
Controller and Detector Terminal Strips
The controller terminal strip and detector terminal strip are two- and four-position plug-in style
terminal strips, respectively. The controller terminal strip is located on the right side of the
amplifier and the detector terminal strip is to the left of it. Both terminal strips are factory wired to
the detector/amp terminal strip on the main circuit board.
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 sample-draw detector’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 upper left corner is the negative (-) test point and the red test
point to the left of the zero and span pots is the positive (+) test point.