what is working principle of presure and temperature guage?
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Answer Posted / b0nz0
There are numerous types of both gauges.
The most common type of pressure gauge is the Bourdon tube.
This consists of a 'C' shaped tube closed at one end. When
pressure is applied to its open end, the tube tries to
straighten due to its oval cross section. This movement is
amplified by a mechanical linkage and gears to give
sufficient movement on a pointer.
One type of temperature gauge also uses a similar principle
where the Bourdon tube is part of a sealed system which is
filled with a fluid. The fluid expands with increasing
temperature causing the pressure in the sealed system to
increase.
Another common type of temperature gauge is the bi-metalic
gauge which depends on the difference of expansion between
two dissimilar metals. The bi-metalic element is
constructed as a helix to give sufficient rotation of the
pointer.
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