A normal pressure gauge， also known as a pressure indicator or pressure gauge, is a mechanical instrument used to measure the pressure of a fluid (liquid or gas) in a system. It's a common tool used in various industries and applications to monitor and control pressure levels.

how a basic pressure gauge works:

Pressure Source: The pressure to be measured is connected to the gauge through a connection point. This could be a pipe, vessel, tank, or any other system containing the fluid whose pressure needs to be monitored.

Mechanical Mechanism: Inside the pressure gauge, there is a mechanical mechanism that responds to the pressure of the fluid. This mechanism often involves a diaphragm, a Bourdon tube, or a helical element. These components change their shape or position in response to the pressure applied.

Linkage: The mechanical movement caused by the change in pressure is then linked to a needle or a pointer on the gauge's face. As the pressure changes, the mechanism moves the needle across a calibrated scale.

Calibrated Scale: The gauge has a scale, usually in units like psi (pounds per square inch), bar, kPa (kilopascals), or other pressure units. The scale provides a numerical indication of the pressure being measured.

Pointer or Needle: The pointer or needle on the gauge's face indicates the current pressure value on the calibrated scale.

Pressure gauges can have different designs and features depending on their specific application. For instance:

Analog vs. Digital: Traditional pressure gauges have analog displays with pointers and scales, while modern ones might have digital displays with numeric readouts.

Pressure Ranges: Gauges come in various pressure ranges, from low pressure for sensitive applications to high pressure for heavy-duty applications.

Materials and Compatibility: The materials used in the gauge construction can be chosen to suit the type of fluid being measured. Some gauges are designed for use with corrosive or aggressive fluids, while others are suited for more general purposes.

Accuracy: The accuracy of a pressure gauge is an important consideration. High-precision applications may require gauges with tighter tolerances.

Mounting: Gauges can be designed for various mounting options, such as panel mount, surface mount, or remote mounting.

Specialized Gauges: Some gauges are designed for specific purposes, like vacuum pressure measurement, differential pressure measurement, or absolute pressure measurement.

Pressure gauges are used in a wide range of industries, including manufacturing, energy, automotive, aerospace, and more, to monitor and control processes, ensure safety, and maintain optimal operating conditions.