Description and operation
© ALSTOM 2010. All rights reserved. Informat
this document is indicative only. No
relied on that it is complete or correct or will apply to any particular project. This will depend on the technical and commercial circumstances. It is
change without notice. Reproduction, use or disclosure to
third parties, without express writt
Absolute pressure = effective pressure + atmospheric pressure
One surface of the diaphragm is in
other is in contact with the atmo-
measurement of the effective pres-
surface of which is in contact with
a vacuum has been developed, the
sure difference between that of the
measures the absolute pressure of
The absolute pressure of the SF
gas introduced into the compart-
ment and hence its density at the
This is measured by means of an
absolute pressure gauge which is
less generally used and more deli-
gauge. This is the reason why a ef-
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