MultiRAE
User’s Guide
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8.3.2 Calibration
Use this menu to perform a bump test or zero or span calibration for one or more sensors, and change the gas
concentration value used in bump tests and span calibration, as well as choose which sensors will be calibrated at the
same time.
8.3.2.1
Fresh Air
This procedure determines the zero point of the sensor calibration curve for all the sensors that require a
zero calibration. For the oxygen sensor, Fresh Air calibration sets the point equal to the concentration of
oxygen in ambient air (approximately 20.9% volume).
Note:
Fresh air calibration is performed on all enabled gas sensors at the same time.
To perform Fresh Air calibration on multiple sensors:
1.
If using dry air, install the calibration adapter and connect it to a source of dry air. Otherwise do not
use calibration adapter to perform fresh air calibration.
2.
At the Calibration Menu, select “Fresh Air.” Press [Y/+] once to enter the fresh air calibration sub-
menu.
3.
Start the flow of dry air, if used.
4.
Press [Y/+] to start fresh air calibration.
5.
A countdown screen appears. 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 fresh air
calibration passed or failed, followed by the sensors’ fresh air readings.
Note:
Dotted line indicates automatic progression.
Summary of Contents for MultiRAE
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