Elements for pressure measurement
Bourdon tubes
A Bourdon tube is a metal coil made of a metal tube that is closed at one end and attached to a pressure source at the other. It has the required elasticity, due to which the pipe tends to deform in order to straighten itself under pressure. Applied pressure will result in movement at the free end causing the mechanical linkage to move the pointer. Bourdon tubes come in several forms, i.e. C tube, spiral or helix.
Bellows
The pressure element of the bellows is made of seamless tubes that are rolled. It looks like thin-walled corrugated cylindrical containers. The corrugator is flexible along its axis so that it changes its length in proportion to the applied pressure.
Diaphragm
A diaphragm sensor is a thin flexible metal disc. Pressure applied to one side of the disc causes a deflection that activates the pointer. To measure very low pressures, the diaphragm must be very thin. In this case, it is difficult to manufacture and its stability is poor. Capsules can be used for this application. It is made of two diaphragms welded together, so it doubles the deflection of the diaphragm, allowing smaller pressures to be measured without reducing its performance.
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