Types of pressure gauge based on the working principle

There are various types of pressure gauges classified according to their working principles. 

These devices are utilized for measuring pressure, and each type features its own unique sensing element that detects the value of the measured pressure. Commonly used pressure gauges include"

• Diaphragm
• Bellow
• Bourdon tube.

 

The diaphragm:

Pressure sensing element consists of an elastic membrane that elongates when pressure is applied. By joining two diaphragms, a capsule is formed, and stacking additional capsules enhances gauge sensitivity. When pressure is exerted on the diaphragm, it flexes, transmitting movement through a link connected to the pointer, which then indicates the applied pressure.

The bellow:

Sensing element, a stacked diaphragm variant, is composed of multiple sheets. Under pressure, the bellow expands, causing elongation, and contracts when the pressure is released. The pointer, linked to the bellows, reflects the pressure changes.

The Bourdon tube:

Depicted as a 'C'-shaped tube, stretches outward when pressure is applied. A link connects the tube end to a pointer, and a link-gear system facilitates pointer movement along the scale. The circular motion of the pinion gear dictates the pointer position, providing a visual representation of the applied pressure on the Bourdon tube.

For further insights, it is recommended to explore the calibration process of pressure transmitters and information on pressure relief valves.