Pressure Gauge For Pneumatic

Pressure gauge is a instrument for measuring the pressure of a fluid (liquid or gas) that is specified by the force that the fluid would exert per unit of the surface area, such as pounds per square inch or newtons per square centimetre.
How many types there are?
Due to the the variations of the gauge applications, the different pressure gauges are designed. They are with different structures, sizes, styles, and materials and designed to fit specific applications. There are several ways pressure gauges are categorized and defined, including by usage, media, and the method used to measure pressure.
Absolute Model
Absolute pressure gauges are used to measure pressure independent of the natural fluctuations in atmospheric pressure.
Bellows Pressure Gauge
It is made of thin walled springy metal connected tubes that form a shape similar to an accordion; this is sealed in the free end of the gauge. As pressure is applied, it acts on the bellows on the free end, causing it to expand and produce movement. Bellows pressure gauges are very sensitive and used for low pressure applications.
Bourdon Tube Model
A Bourdon tube model has an elastic tube that is soldered or welded on one end into a socket. A change in pressure causes deflection in the tube; this is proportional to the applied pressure and is sent to a rotary gear with a pointer.

Differential (DP) Pressure Gauge

The difference between the pressure in two chambers separated by an element that moves back and forth according to the changes in pressure is measured by the differential pressure gauge. A diaphragm present in the differential pressure gauge separates the media chamber from the vacuum chamber. When the pressure increases, the diaphragm deforms into the vacuum chamber. The deformation and change are converted into a pressure value
Manometer Pressure Gauge
Manometer pressure gauges measure pressure on a fluid by balancing one column of fluid against a second column of fluid. This type of pressure gauge is the simplest type and consists of a transparent tube in the form of a “U” that is partially filled with a manometric fluid like mercury. In its simplest form, one end of the tube is connected to the location in which pressure is to be measured, while the other end is open to the atmosphere; this can be seen in the diagram below.
Piezometer Pressure Gauge
A piezometer is a type of manometer that is used to measure the medium pressure range of liquids; it is a simple glass tube that is open at both ends. One end is connected to a pipe line where the pressure of a fluid is to be measured, while the other end is open to the atmosphere. The tube is attached vertically such that the liquid in the pipe can rise into the tube. The pressure reading is indicated by the height of the fluid in the tube.