What instrument is used to measure boiler pressure and how does it work?

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Measuring boiler pressure is about turning the pressure inside the system into a readable motion on a dial. The Bourdon tube gauge does this with a hollow, curved tube. When pressure inside increases, the tube tends to straighten, and that slight change in shape is transferred through a mechanical linkage to move a pointer around the dial. The result is a direct, visible pressure reading in units like psi or bar. This type is favored on boilers for its rugged, simple design and because it doesn’t require electrical power. Digital sensors exist as an alternative, but they use electronic sensing rather than a mechanical pointer. Thermometers measure temperature, and barometers measure atmospheric pressure, so they aren’t suitable for indicating boiler pressure.