Pressure Gauge 100mm (4 Inch)

A pressure gauge is a mechanical instrument used to measure and display the pressure of a fluid (liquid or gas) in a closed system. Pressure gauges are widely employed in various industrial, commercial, and scientific applications to monitor and control pressure levels. They are essential tools for maintaining the safety and efficiency of many processes and systems.

Here is a description of the key components and characteristics of a typical pressure gauge:

1. Dial Face: The pressure gauge features a round or square dial face with numerical markings, typically in units of pressure such as psi (pounds per square inch), bar, kPa (kilopascals), or other relevant units. The dial face may also include color-coded zones to indicate safe, cautionary, or critical pressure ranges.
2. Pointer: A needle or pointer on the dial face moves in response to changes in pressure. The position of the pointer corresponds to the current pressure reading.
3. Pressure Connection: Pressure gauges have an inlet or pressure connection on the back or bottom of the gauge. This connection is where the gauge is attached to the system or equipment from which pressure is being measured. It allows the pressure to be transmitted to the internal components of the gauge.
4. Bourdon Tube: The most common type of pressure gauge uses a Bourdon tube as the sensing element. The Bourdon tube is a curved, hollow, and flexible tube that expands or contracts in response to changes in pressure. As it deforms, it causes the pointer to move, providing a visual indication of pressure on the dial.
5. Scale and Units: The dial face includes a scale that corresponds to the pressure range of the gauge. The scale is marked with graduations that allow for precise pressure readings. The units of measurement are typically indicated on the scale.
6. Casing or Housing: The gauge is enclosed in a protective casing or housing made of metal or plastic. This casing not only protects the internal components but also provides rigidity and durability to the gauge.
7. Mounting: Pressure gauges can be mounted on various surfaces, including pipes, panels, or equipment, using threaded connections or mounting flanges. The mounting method depends on the application and the gauge’s design.
8. Pressure Type: Pressure gauges are designed to measure either absolute pressure, gauge pressure, or differential pressure. Absolute pressure gauges measure pressure relative to a perfect vacuum, gauge pressure gauges measure pressure relative to atmospheric pressure, and differential pressure gauges measure the difference in pressure between two points in a system.
9. Accuracy: Pressure gauges come in various accuracy classes, with higher-precision gauges used in critical applications where precise pressure measurements are essential.
10. Special Features: Some pressure gauges come with additional features such as liquid-filled casings to dampen vibrations, pressure-limiting devices to protect against overpressure, and electrical contacts for use in control or alarm systems.

Pressure gauges are vital tools in industries such as manufacturing, oil and gas, chemical processing, HVAC, and healthcare, where pressure control and monitoring are crucial for safety, quality, and process efficiency. Proper calibration and maintenance of pressure gauges are essential to ensure their accuracy and reliability over time.