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10.4.3 Multi-Sensor Span Calibration
This lets you perform a span calibration on multiple sensors simultaneously. It requires using the
appropriate span gas and that the concentration labeled on the gas cylinder matches the
concentration programmed in the QRAE 3.
1. Start the flow of calibration gas.
2. Attach the calibration adapter and gas to the QRAE 3.
3. Press [Y/+] to begin calibration. A countdown screen is shown. You can abort the
calibration at any time during the countdown by pressing [MODE].
If the calibration reaches its conclusion, it shows the sensor names and tells you whether the
calibration passed or failed, followed by the sensor readings.
10.4.4. Single-Sensor Span Calibration
To perform span calibration of an individual sensor, follow these steps:
1. At the Calibration Menu, select “Single Sensor Span.”
2. Select a sensor from the list.
3. Start the flow of calibration gas.
4. Connect the calibration adapter and connect it to a source of calibration gas.
5. Verify that the displayed calibration value meets the concentration label on the gas
cylinder.
6. Press [Y/+] to start calibrating. You can abort the calibration at any time during the
countdown by pressing [MODE].
After a timer countdown, the span calibration is done. The LCD will display whether the
calibration was successful and the reading for that calibration gas.
Note: If the sensor calibration fails, try again. If calibration fails again, turn off the power and
then replace the sensor.
WARNING: Do not replace sensors in hazardous locations
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