Which Mechanical Gauges are used to measured Fluid Pressure?

A Mecahnical gauge is best to measure High Fluid Pressure,where Tube Gauge cannot be conveniently used.The principle on which all Gauges work is
almost same.Following three types of Gauges are more important from subject point of view.

01)Burdon's Tube Pressure Gauge:-
The Burdon's Tube Pressure Gauge is most suitable to measure the pressure of fluid,above or below the Atmosphere Pressure.In its simplest form,consists
of an elliptical tube ABC,bent into an arc of a circle.

This bent-up tube is connected to the fluid at C (inlet of Fluid),the pressurised fluid flows into the tube,as a result of the increased Pressure,tends to
straighten itself.

The tube tends to become circular as it is encased in circular cover.With the help of simple Pinion and Sector arramgement,the elastic deformation of the
Burdon's tube rotates the Pointer.This Pointer moves over a Clibrated Scale.Which directly shows the Pressure.

02)Diaphgram Pressure Gauge:-
This Pressure Gauge is also used to found out the Pressure of a Fluid,above or below Atmosphere Pressure.Instead of Burdon's tube a Corrugated Diaphragm
is used,hence it is called Diaphgram Pressure Gauge.

When the Gauge is connected to the Fluid at C(inlet of Fluid), causes some deformation of the Diaphgram due to fluid pressure.With the help of some Pinion
arrangement,the elastic deformation of the Diaphgram rotates the Pointer.This Pointer moves over the Clibrated Scale.Which directly shows the Pressure.

A Diaphgram Pressure Gauge is generally,used to measure relatively Low pressure.

03)Dead Weight Pressure Gauge:-
This type of Pressure Gauge is generally used for the Calibration of the other Pressure Gauge in a Laboratory.In its simplest form,consist of a Piston and a
Cylinder of known area and connected to a Fluid by a Tube.

A Pressure Gauge,to be Clibrated,is fitted on the other end of the tube.By changing the Weight,on the Piston,the Pressure on the Fluid is calculated and
marked on the Pointer.

By taking adequate precaution,a small error due to Frictional Resistance to the Motion of the Piston,an be avoided.

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