A pressure gauge is fitted in front of boiler in such a position that the operator can conveniently read it. It reads the pressure of steam in the boiler and is connected to steam space by a siphon tube. The most commonly, the Bourdon pressure gauge is used.
- Normally Bourdon type pressure gauges are used in a boiler.
- Figure shows the sketch of a pressure gauge in which we find the Bourdon tube elliptical cross-sectional (area) is connected by levers and gears to the pointer.
- The fluid pressure when transferred to the Bourdon tube tries to make the cross-section circular and in this process the end of the tube moves out which is communicated through links to the pointer which moves over the scale and indicates the pressure.
- The pressure gauge is connected to the boiler through a siphon tube filled with water.
Figure : Pressure Gauge