Pressure gauges are classified based on various criteria, including their operating principle, construction, application, and the type of pressure they measure. Here’s an overview of the main classifications of pressure gauges:

1. Based on Operating Principle

• Bourdon Tube Gauges: Utilize a curved tube that straightens when pressure is applied. Commonly used for measuring a wide range of pressures.

• Diaphragm Gauges: Use a flexible diaphragm that deforms under pressure. Suitable for measuring low pressures and often used in sanitary applications.

• Capsule Gauges: Consist of two diaphragms forming a capsule. They are effective for low-pressure measurements.

• Piezoelectric Gauges: Use piezoelectric materials to measure pressure changes. Common in dynamic pressure applications.

2. Based on Pressure Measurement Type

• Absolute Pressure Gauges: Measure pressure relative to a perfect vacuum (zero reference). Used in applications requiring precise pressure measurements.

• Gauge Pressure Gauges: Measure pressure relative to atmospheric pressure. They indicate the pressure above or below the atmosphere.

• Differential Pressure Gauges: Measure the difference between two pressures. Often used in flow measurement and filtration applications.

3. Based on Construction Type

• Analog Pressure Gauges: Use a mechanical display (dial) to show pressure readings. Typically easier to read at a glance.

• Digital Pressure Gauges: Provide electronic readings of pressure. They may include additional features like data logging and connectivity.

• Transducer Pressure Gauges: Convert pressure into an electrical signal for more precise measurement and integration with digital systems.

4. Based on Application

• Industrial Pressure Gauges: Designed for use in harsh industrial environments, often featuring rugged construction and high accuracy.

• Laboratory Pressure Gauges: Used in laboratory settings, emphasizing accuracy and calibration capabilities.

• Sanitary Pressure Gauges: Designed for use in food, pharmaceutical, and other sanitary applications, ensuring compliance with hygiene standards.

5. Based on Measuring Range

• Low-Pressure Gauges: Designed for measuring pressures below 1 bar (14.5 psi). Suitable for HVAC and other low-pressure applications.

• Medium-Pressure Gauges: Typically measure pressures between 1 and 100 bar (14.5 to 1450 psi). Common in industrial applications.

• High-Pressure Gauges: Designed for pressures above 100 bar (1450 psi). Used in oil and gas, hydraulic systems, and other high-pressure environments.