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Calibration
61-1020/61-0230 Molecular Property Spectrometer
Setting the Zero Reading
CAUTION:
If you suspect the monitoring environment is not free of combustible vapors, use the
calibration kit and a zero air calibration cylinder to introduce “fresh air” to the
detector and verify an accurate zero setting
1. To calibrate the unit for fresh air monitoring, ensure that
a zero air
calibration cylinder is used
to set the zero reading.
2. Allow the combustible detector to warm up for at least 2 minutes.
WARNING: Do not expose the sensor to combustible gas during the 2 minute warmup
period. Exposing the sensor to gas will result in a failure condition.
3. Follow the directions in the controller’s operator’s manual for setting the zero reading.
Setting the Response Reading
1. Follow the directions in the controller’s operator’s manual for setting the response reading
(span).
2. When the directions call for exposing the detector to gas, screw the regulator into the
methane in real air
cylinder provided by RKI Instruments Inc.
3. Turn the on/off knob counterclockwise to open the regulator.
4. Allow the gas to flow to the detector for 1 minute before continuing with the directions.
5. After setting the response reading, turn the on/off knob clockwise to close the regulator,
unscrew the regulator from the cylinder and remove the calibration cup from the detector.
6. Allow the reading at the controller to decrease below the alarm points before returning the
controller to normal operation or enabling external alarms.
NOTE:
If you do not allow the gas reading decrease below the alarm points, then
unwanted alarms may occur.
7. Verify that the controller display reading decreases and stabilizes at 0% LEL.
8. Store the components of the calibration kit in a safe and convenient place.
