Calibration, Preparing for calibration, Entering the calibrate program – RKI Instruments Pioneer 4W User Manual
Page 70: Setting the fresh air reading, Verify a voltmeter reading of 434.4 mv (±2 mv)
Combustilbe Gas Transmitter • 24
Pioneer Operator’s Manual (PRELIMINARY)
Calibration
This section describes how to calibrate the combustible gas transmitter. It includes
procedures to prepare for calibration, enter the Calibrate program, set the zero reading, set
the response reading, and return to normal operation.
WARNING: The Pioneer is not an active gas monitoring device during the calibration
procedure.
Preparing for Calibration
1.
Slide the calibration cup over the bottom of the combustible gas detector, then secure
the calibration cup to the detector with the two screws.
2.
Use the sample tubing to connect the regulator to the calibration cup.
NOTE:
Do not screw the regulator into the zero air calibration cylinder at this time.
3.
Set a voltmeter to measure in the millivolt (mV) range.
4.
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-.
5.
Use the following formula to determine the correct test points output for the
calibrating sample.
Output (mV) = (calibrating sample/fullscale) X 400 + 100
For example, with a calibrating sample of 50% LEL and a fullscale setting of
100% LEL, the correct output is 300 mV.
300 (mV) = (50/100) X 400 +100
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 calibration time-out setting in the Instrument Setup program
(see Chapter 4, Operation.)
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