9-28 Chapter 9: Inspection and Maintenance 42/24-10 EN Rev. 9
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
Air pressure effect can 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.
Analyzer Module Pressure Sensor
Uras26, Limas11, Caldos27 built-in at the factory
Caldos25 not necessary
Magnos206, Magnos27 built-in at the factory as an option
Which analyzer
modules have a
pressure sensor?
MultiFID14 cannot be built in
Use the MENU
→ Diagnostic/Information → System overview menu
item and select the appropriate analyzer module to determine if a pressure sensor
is installed.
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
Air Pressure Values
2000 793 11.50 595 23.43
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