Compare Bellows and diaphragm w.r.to construction, sensitivity, working principle and application.
Sr. No
|
Points
|
Bellows
|
diaphragm
|
1 |
construction
|
|
|
2 |
sensitivity
|
Less sensitive as compared to diaphragm
|
More sensitive as compared to diaphragm
|
3 |
working principle
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When there is no pressure applied to the bellows there is no any movement of the wall elements, as soon as pressure is applied inside the bellows there is an expansion on the wall of bellows.
|
Change in pressure causes change in dimension of diaphragm, which is transmitted to the rotary pointer through mechanical linkage. The pointer gives the reading proportional to applied pressure
|
4 |
Application
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I. These are used in the large indicating gauges, recorders where space is not a problem. ii. It is useful in pneumatic controllers. iii. low pressure gauges are suitable for chemical, petrochemical, plant construction, and cleanrooms
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I. Diaphragm pressure gauges are used for relative pressure as well as for vacuum, compound and differential pressure applications. II. For corrosive gases and liquids
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