Spiral type Bourdon

The working principle of spiral type bourdon tube is that the applied pressure is converted into mechanical deflection or displacement. The generated displacement will give the value of applied pressure. The materials used in the construction of bourdon tube are brass, steel and rubber.

Construction and Working

Spiral type bourdon tubes are constructed by winding the long tube into several turns in the form spiral shape. One end of the bourdon tube is opened through which the pressure to be measured is applied whereas another end is closed. The sealed end of the tube is connected to a pointer mechanically.
Whenever the fluid whose pressure is to be known is applied to the open end of the spiral tube, it tends to uncoil. Due tothis a long movement of the tip (end) takes place and this displacement is transmitted to pointer. Therefore the pointer moves on the calibrated scale, thereby indicating the applied pressure. When compared to C-type bourdon tube spiral type bourdon tube produces the results with very high accuracy.