Bourdon Gauge
A Bourdon gauge measures pressure by converting the pressure of a fluid or gas into mechanical motion. It is one of the most common pressure-measuring devices used in industry.
A Bourdon gauge consists of a curved (usually C-shaped or helical), hollow, thin-walled metal tube (the Bourdon tube) that is fixed at one end and mechanically connected to an indicator at the other. The indicator moves over a semi-circular scale that is calibrated in units of pressure.
When pressure is applied to the inside of the tube, the tube tends to straighten. With the rack and pinion of the linkage mechanism, the small movement of the Bourdon tube is amplified so that the pointer moves across the scale.
The Bourdon gauge has a typical accuracy of ±1% to ±2% of full scale.
