E+E Elektronik OMNIPORT 20 Manuel page 51

Manual
page 52
Additional information about measuring the
RH/T - Probes
Pressure dependence of the mixture ratio:
For precise determination of the mixture ratio in g/kg or gr/lb at different
altitudes h, the affect of air pressure on the measurement value can be
corrected using the barometric height formula.
The usual method is to multiply the mixture ratio by a corresponding
correction factor (quotient of average air pressure / actual air pressure).
The calculated correction factor can be applied using the Pabs extra
function in the measurement device.
Note: If the actual air pressure is not known, average values for altitudes
can be used for minimizing the influence of pressure (see table).
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