RKI Instruments Pioneer 4W - Manual (Page 80)

Oxygen Transmitter • 4 Pioneer Operator’s Manual (PRELIMINARY)
Span potentiometer
The span potentiometer is near the top of the amplifier. Of the three potentiometers, the
span potentiometer is farthest to the left. Use the span potentiometer to adjust the
transmitter’s response output during the start-up and calibration procedures.
Zero potentiometer
The zero potentiometer is to the right of the span potentiometer. Use the zero
potentiometer to adjust the transmitter’s oxygen-free output during the calibration
procedure.
CAUTION: The third potentiometer is factory-set. Do not adjust it.
Test points
The test points (labeled TP- and TP+ ) are directly above and below the interconnect
terminal strip. The test points produce a 100 to 500 mV output that is proportional to the
transmitter’s 4 to 20 mA output. Use the test points and a voltmeter to measure the
transmitter’s output during the start-up and calibration procedures.
Amplifier junction box
Use the amplifier junction box to install the amplifier at a mounting site that is remote
from the Pioneer. The junction box also protects the amplifier and wiring connections
made to the amplifier. Use the two 3/4 in. conduit hubs to connect the detector junction
box to the amplifier junction box (bottom hub) and connect wiring from the amplifier to
the Pioneer (top hub).
NOTE: The amplifier is factory-mounted to the amplifier junction box.
Use the amplifier junction box’s two mounting holes to mount the oxygen transmitter to a
vertical surface at the monitoring site. Use the cover on the front of the junction box to
access the interior of the junction box.