Figure 2 illustrates the components of a bourdon tube pressure gauge. This pressure gauge is attached to a pipeline at the inlet pipe (A). The inlet pipe is held in place by the socket block (B), which also holds the device to the process line. Pressure flows into the stationary end of the Bourdon tube (C). The pressure is distributed through the C-shaped Bourdon tube (D). As a result of this pressure, the C-shape straightens. A pivot and pivot pin (E) connect the straightening movement with the sector gear (F) at the moving end of the Bourdon tube. Due to the gearing system, the movement at the moving end of the Bourdon tube is amplified so that a very slight pressure change results in a considerable motion of the indicator needle (G). Generally, the indicator moves from left to right in a circular path over a calibrated scale. A decrease in pressure will result in the Bourdon tube returning to its original position.
The bourdon tube pressure gauge exhibits high sensitivity to pressure changes, thus, ensures higher accuracy and precision in the reading. Furthermore, the vibration and corrosion resistance offered by the pressure gauge makes it the preferred choice of many industries for their pressure measurement applications. There are various designs available for pressure gauges besides the bourdontube, these include the bellows pressure gauge and the diaphragm pressure gauge.
