RKI Instruments Pioneer 4W - Manual (Page 99)

Pioneer Operator’s Manual (PRELIMINARY) Oxygen Transmitter • 23
Calibration
This section describes how to calibrate the oxygen transmitter. It includes procedures to
set the fresh air reading, assemble the calibration kit, enter the Calibrate program, set the
zero reading, and return to normal operation.
WARNING: The Pioneer is not an active gas monitoring device during the calibration
procedure.
Setting the Fresh Air Reading
1. Verify that the oxygen transmitter is in a fresh air environment (environment known
to be of normal oxygen content).
2. Set a voltmeter to measure in the millivolt (mV) range.
3. Remove the junction box cover, then plug the voltmeter leads into the test points on
the amplifier.
Plug the positive lead into the test point labeled TP+; plug the negative lead into the
test point labeled TP-.
4. Verify a voltmeter reading of 434.4 mV (±2 mV).
5. If necessary, use a flat-blade screwdriver to adjust the span potentiometer until the
voltmeter reading is 434.4 mV (±2 mV).
Assembling the Calibration Kit
1. Connect one end of the sample tubing to the regulator.
2. Connect the opposite end of the sample tubing to the calibration cup.
NOTE: Do not screw the regulator into the calibration cylinder at this time.
Entering the Calibrate Program
1. Open the housing door of the Pioneer, and locate the program buttons to the right of
the display screen.
2. Press the ENTER and UP/YES buttons simultaneously three times.
The Calibrate program screen appears.
NOTE: Once you enter the Calibrate program, the status lights, buzzer, and relays are
disabled until you exit the Calibrate program.
The Pioneer automatically exits the Calibrate program if you do not exit the
program before the calibration time-out setting expires. You can display and
change the settings in the Instrument Setup program (see Chapter, Operation.)
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