QRAE II User Guide
Page 12
If the reading is about 25% oxygen after a conditioning cycle, the monitor offers two
options in its display:
1. Wait. This means that the monitor will run a second cycle of conditioning.
2. Measure. This means that the QRAE II will exit the conditioning menu and continue
the start-up process.
Note: The time necessary for conditioning depends on how long the monitor has been
without power. If two conditioning cycles are run, and conditioning still has not occurred,
then the monitor may have drifted (or a sensor has been replaced). Therefore, a fresh air
calibration is required. Select “Measure” and perform a fresh air calibration. Observe the
reading for 5 minutes to ensure the sensor is stable.
After checking the oxygen conditioning, the QRAE II checks the calibration due date that
has been set, and if that date has passed, a message prompting you to calibrate the
monitor is displayed, “Cal due expired!” Press either key to continue (there is a
“Continue” prompt). Once the monitor has finished startup, you should perform a
calibration.
If “Power On Zero” is activated (see page 44 for details), the display shows the following
message that prompts you to perform a fresh air calibration:
If you want to perform a fresh air calibration, refer to the steps outlined on page 27, and
then press [MODE] for “OK” to start the fresh air calibration. Otherwise, press [Y/+] for
“Cancel.”
The QRAE II performs a final checkout and the screen shows a countdown to full
operational functionality.
If Datalog is on, this message is displayed after the countdown:
Datalog Started
When the QRAE II is ready for use, it shows this screen:
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