AO2000 CONTINUOUS GAS ANALYZERS | OI/AO2000-EN REV. B 271
Air pressure correction
Air pressure effect
A specific amount of change in air pressure will result in a specific change in
a measurement value, depending on the measurement principle employed
by the analyzer module.
Measures to minimize air pressure effect
The air pressure effect be minimized by
• installing a pressure sensor in the analyzer module (this can only be done
at the factory) or
• Entering the current atmospheric pressure as a correction value.
In which analyzer modules is a pressure sensor installed?
Analyzer module Pressure sensor
Limas11 IR, Limas21 UV, Limas21 HW,
Caldos27, Uras26
installed ex works
Magnos206, Magnos28, Magnos27 installed ex works as an option
Caldos25, Fidas24, ZO23 not required
The information as to whether a pressure sensor has been installed in an
analyzer module can be found in the
MENU
→ Diagnosis/Information → System Overview
menu item after selecting the respective analyzer module.
Air pressure values
Operating altitude Mean air pressure
meters above mean sea level hPa (mbar) psi mm Hg (Torr) in Hg
−200 1037 15.04 778 30.63
−100 1025 14.87 769 30.28
±0 1013 14.69 760 29.92
+100 1001 14.52 751 29.57
200 989 14.34 742 29.21
300 977 14.17 733 28.86
400 965 14.00 724 28.50
500 955 13.85 716 28.19
600 943 13.68 707 27.84
700 932 13.52 699 27.52
800 921 13.36 691 27.21
900 909 13.18 682 26.85
1000 899 13.04 674 26.54
1100 888 12.88 666 26.22
1200 877 12.72 658 25.91
1300 867 12.57 650 25.59
1400 856 12.42 642 25.28
1500 845 12.26 634 24.96
1600 835 12.11 626 24.65
1700 825 11.97 619 24.37
1800 815 11.82 611 24.06
1900 804 11.66 603 23.74
2000 793 11.50 595 23.43
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