•    The most commonly used mechanical gauge is Bourdon type pressure gauge.

•    It is a stiff, flattened metal tube bent into a circular shape.

•    The fluid whose pressure is to be measured inside the tube.

•    One end of the tube is fixed and other end is free to move inward or outward.

•    The inward and outward movement of free end moves a pointer, though a linkage and gear arrangement, a dial graduated in pressure unit i.e. bar.

•    The movement of the free end of the Bourdon tube is proportional to the difference between the external atmospheric pressure and internal fluid pressure.

•    Bourdon gauge records the gauge pressure which is the different between fluid pressure and outside atmospheric pressure.


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