10
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.
Caution! If your QRAE II is a diffusion model, do not use the Calibration Adapter while performing zero
calibration in fresh air.
1. If the QRAE II is off, turn it on (hold down [MODE] for 2 seconds).
2. After startup, press and hold both keys.
3. At Calibrate Monitor, press [Y/+]. The display should show: Fresh Air Calibration?
4. Press Y+ to start calibration. Calibration is performed automatically (there is a 30-second countdown).
When the zero calibration is successful, the display should show a reading of “20.9” for the oxygen sensor and
“0” for all other sensors.
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