MultiRAE
User’s Guide
30
8.3.2.2
Multi Sensor Span
Depending on the configuration of your MultiRAE and span gas you have, you can perform a span
calibration simultaneously on multiple sensors. You can define which sensors are calibrated together
using the Multi Cal Select menu described in section 8.3.2.9.
In case all sensors in the instrument cannot be calibrated with the same gas, the MultiRAE will
intelligently split the span calibration process into several steps and will provide menu prompts
accordingly.
1.
At the Calibration Menu, select “Multi Sensor Span.”
2.
Install the calibration adapter and connect it to a source of calibration gas.
3.
Start the flow of calibration gas.
4.
Press [Y/+] to start calibrating or wait for calibration to start automatically.
5.
A countdown screen is shown. You can abort the calibration at any time during the countdown by
pressing [N/-].
6.
If the calibration is not aborted, the display shows the sensor names and tells you whether the
calibration passed or failed, followed by the sensor readings.
8.3.2.3
Single Sensor Zero
This allows you to perform zero (fresh air) calibration on individual sensors. Even though most toxic gas
sensors can be zeroed in fresh air, sensors such as the CO
2
and parts-per-billion PID sensor for volatile
organic compounds (VOCs) should not be zeroed in fresh air. Both CO
2
gas and VOCs are normally
present in ambient air, so zeroing these sensors in ambient air will not allow for a true zero to be set for
such sensors. The CO
2
sensor should be zeroed in 99.9% nitrogen, and the parts-per-billion PID sensor
with ambient air using a charcoal filter or a VOC zeroing tube.
1.
If you are using a charcoal filter, connect it to the instrument.
2.
If you are using dry air, install the calibration adapter and connect it to a source of dry air.
Note:
Dotted line indicates automatic progression.
Summary of Contents for MultiRAE
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