How Pressure Gauges Work?


Most gauges are constructed with bourdon tubes to measure vacuum and pressure. The bourdon tube flexes when pressure is applied, since it naturally wants to straighten out but cannot because it is linked to a geared movement.  The linear movement is changed as it tries to flex, to a rotational one by means of small gears.  The gears in-turn cause the pointer to indicate the measured pressure, in which gauges like this are designed for clean, non-clogging liquids and gases.
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The way a Bourdon pressure gauge works is this. Its basic element is a flattened, flexible metal tube that is closed at one end and bent into a semicircular shape ...
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