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7.
Product types
Product type
Definition
Unit
Measuring range
Absolute
Humidity
absolute air humidity
g/m³
0 to 130 g/m³
Dew Point
Dew Point
°C
°F
-55 °C to +60 °C
-67 °F to 140 °F
relativ Humidity
relative air humidity
% RH
0 to 100 %
EMC Wood
Wood equilibrium moisture content
%
EMC.
2 to 30 %
(wood moisture)
EMC POM
POM equilibrium moisture content
%
EMC.
0 to 2 %
Water
Activity
water activity
aw
0 to 1
Empty 1 - 5
Free curve for special products
7.1
Definition product types
Absolute humidity
The absolute air humidity shows the contained amount of water in gram per cubic
meter of air. The absolute humidity is a direct degree for the amount of water vapor
contained in a certain air volume. It shows how much condensate can precipitate or
how much water has to be evaporated in order to obtain the desired humidity.
Dew Point
The dew point is the temperature to which the air that is not completely saturated with
water vapor must be cooled so that it is completely saturated. When a room with the
current relative humidity cools down to the dew point temperature, the water vapor
begins to condense.
Relative humidity
Indicates the relationship between the current water vapor pressure and the maxi-
mum possible, the so-called saturation vapor pressure.
The relative humidity shows the degree the air is saturated with water vapor.
Examples:
50% relative humidity: At the current temperature and pressure, the air is half satura-
ted with water vapor. 100% relative humidity means that the air is totally saturated
with water vapor. If the air has more than 100% humidity, the excessive humidity
would condense or precipitate as mist.
