QRAE II
User’s Guide
Page 76
Connecting Calibration Gas
1.
Verify the pump is drawing sample (more than 250 CC/min. if in doubt check the
flow with a flow meter range between 250 CC/min and 500 CC/min)
2.
Connect the calibration gas to the QRAE II as shown.
Sensor Calibration Time
The QRAE II is designed to automatically use a predetermined calibration time.
Zero (Fresh Air) Calibration
This procedure determines the zero point of the sensor calibration curve. Expose the inlet
to a clean air source with 20.9% oxygen and without any organic, toxic or combustible
gas impurities. This “Zero Air” can be from a cylinder, clean ambient air, or ambient air
purified through a charcoal filter.
Using Fresh Air
Caution!
Do not use the Calibration Adapter while performing zero calibration in fresh
air.
Turn on the QRAE II and follow this procedure:
1.
Enter Program Mode.
