6 Calibration
After completing the installation and before setting the analyzer in
opera-
tion, the analyzer must be calibrated.
After switching the power on, the analyzer readings shall be stable before starting cali-
bration, which will normally take about five minutes of warm-up time.
The analyzer is arranged for calibration by using certified calibration gases or instrument
air. In addition, the analyzer can be artificially calibrated. However, artificial calibration
should only be used for intermediate purposes and cannot replace manual calibration
with a known and certified calibration gas.
For the purpose of calibration, the signal from sensor shall be stable for at least 10
seconds. Therefore, during calibration there must not be variations in pressure or
flow in the calibration gas supplied to the sensor.
In order to have an accurate result, the pressure and flow rate of the sample gas
should be the same as the pressure and flow rate of the calibration gases.
During the calibration with known oxygen gases, press will restart the analyzer
without changing any change of settings and calibration values.
6.1 Calibration with Known Oxygen Gases
The zero-calibration gas to be used shall be a mixture of pure nitrogen with a known
amount of oxygen. The best practice of zero calibration is to use a calibration gas just be-
low the target range of the application.
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