Correct designation, operating
pressure of 0 bar relative pressure is
equivalent to 1 bar absolute pressure.
A vacuum is generally specified as
relative operating pressure, i.e. with a
negative sign.
Operating pressure can be specified
correctly in two different ways, i.e. as
a relative or an absolute value. Both
specification options are also applied
to vacuums and are explained in more
detail below.
Applications:
In the field of science as well as in the
medium-high and high vacuum
ranges.
Principle:
Vacuum is specified as an absolute
value in proportion to absolute zero,
i.e. 0 bar is the lowest value and
corresponds to 100% vacuum. In the
vacuum range, 1 bar is thus the
highest value and corresponds to the
average ambient pressure.
Feature:
Vacuum values have positive signs.
Vacuum range 1 … 0 bar
Applications:
In the rough or operating vacuum
range (e.g. for Festo applications).
Principle:
Vacuum is specified as a relative
value in proportion to ambient
pressure, i.e. the specified vacuum
value has a negative sign, because
the ambient pressure (atmospheric
pressure) has been assumed as the
reference point with a value of 0. The
lowest value, i.e. also 100% vacuum
corresponds to –1 bar relative
operating pressure.
Feature:
Vacuum values have negative signs.
Vacuum range 0…-1 bar
Correct designation, operatingpressure of 0 bar relative pressure isequivalent to 1 bar absolute pressure.A vacuum is generally specified asrelative operating pressure, i.e. with anegative sign.Operating pressure can be specifiedcorrectly in two different ways, i.e. asa relative or an absolute value. Bothspecification options are also appliedto vacuums and are explained in moredetail below.Applications:In the field of science as well as in themedium-high and high vacuumranges.Principle:Vacuum is specified as an absolutevalue in proportion to absolute zero,i.e. 0 bar is the lowest value andcorresponds to 100% vacuum. In thevacuum range, 1 bar is thus thehighest value and corresponds to theaverage ambient pressure.Feature:Vacuum values have positive signs.Vacuum range 1 … 0 barApplications:In the rough or operating vacuumrange (e.g. for Festo applications).Principle:Vacuum is specified as a relativevalue in proportion to ambientpressure, i.e. the specified vacuumvalue has a negative sign, becausethe ambient pressure (atmosphericpressure) has been assumed as thereference point with a value of 0. Thelowest value, i.e. also 100% vacuumcorresponds to –1 bar relativeoperating pressure.Feature:Vacuum values have negative signs.Vacuum range 0…-1 bar
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