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Bourdon tube

Bourdon tube

The Bourdon tube was invented by Eugène Bourdon (1808–84), a French watchmaker and engineer. The

pressure-sensing element is a tube with either a flat or elliptical section; it is formed as a spiral or curve.


 One end of the tube is sealed and connected to a pointer mechanism, the open end is connected to

the fluid system via a pipe.


As the applied pressure from the fluid system increases, the tube will tend to straighten out, while a reduced pressure will cause the tube to return to its original shape.


 This movement is transferred via the gear mechanism to move a pointer. The pointer

moves across a scale thereby providing a direct reading of pressure.


 Materials used for the tube are selected for the pressure range being measured; these include phosphor bronze (0–1000 psi) and beryllium copper (0–10,000 psi). The Bourdon tube principle can also be used to remotely measure pressure.


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