MultiRAE User’s Guide
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10.5.2 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 MultiRAE.
For a multi-sensor span calibration, a constant-flow regulator producing 0.5 to 1 liters per minute should
be used, and the calibration cap must be installed on the instrument. Testing and calibration with an
AutoRAE 2 must be performed using demand-flow regulators. A calibration cap must not be used. Teflon
tubing must be used to test or calibrate the PID sensor. Follow the steps described here to perform a
multi-sensor span calibration:
1. Attach the calibration adapter and connect gas to the MultiRAE.
2. Start the flow of gas and then either press [Y/+] to begin calibration or wait for calibration to start
automatically once the sensor “senses” the gas. A countdown screen is shown. You can abort the
calibration at any time during the countdown by pressing [N/-].
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.
Note: If there are other sensors to be calibrated at this stage, the screens will guide you through the
process.
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