ABB AO2000 Series - Page 72

72 AO2000 CONTINUOUS GAS ANALYZERS | OI/AO2000-EN REV. B
Test gases
Zero-point calibration
Zero is not calibrated since it is fundamentally stable.
End-point calibration
Ambient (non-process) air with constant oxygen content (20.96 vol.%) or
synthetic air
Dew point
The dew point of the test gases must be approximately the same as the dew
point of the sample gas.
NOTE
The notes for calibrating (see page 264) must be considered.