How to Choose the Pressure Gauge Model?

We often use pressure gauges with accuracy grades of 0.25, 0.4, 1.0, 1.5, and 2.5. These five grades should be selected from the perspective of production process accuracy requirements and the most economical angle.

The maximum allowable error of the gauge is the product of the range and accuracy grade percentage of the gauge. If the error exceeds the accuracy required by the process, a pressure gauge with a higher accuracy grade needs to be replaced.

Pressure gauges for general media measurement

• Membrane pressure gauges should be used when the pressure is between -40 kPa and +40 kPa.

• Spring tube vacuum gauges should be used when the pressure is between -100 kPa and 0 kPa.

• Pressure and vacuum gauges should be used when the pressure is between -100 kPa and +2400 kPa.

• Spring tube pressure gauges or corrugated tube pressure gauges are generally used when the pressure is above +40 kPa.

How to select pressure gauges for different working environments

• Acid-resistant pressure gauges or stainless steel membrane pressure gauges should be used for general corrosive media such as dilute nitric acid and acetic acid.

• Membrane pressure gauges or diaphragm pressure gauges should be used for corrosive media with strong corrosiveness, such as dilute hydrochloric acid, hydrochloric acid gas, heavy oil, and similar media containing solid particles or viscous liquids. The material of the membrane or diaphragm must be selected according to the characteristics of the measured medium.

• Flange diaphragm pressure gauges should be used for media with high viscosity, such as crystals, scars, etc.

• Vibration-resistant pressure gauges or ship pressure gauges should be used in situations with strong mechanical vibrations.

• Explosion-proof pressure controllers or explosion-proof electrical contact pressure gauges should be used in explosive environments where electrical contact signals are required.

• For pressure gauges that measure high or medium pressure or strong corrosive media, a shell with overpressure release should be selected.

• The pressure gauge installed on pipelines and equipment has a dial diameter of 100 mm or 150 mm. The pressure gauge installed on instrument pneumatic pipelines and auxiliary equipment has a minimum dial diameter of 60 mm. The pressure gauge installed in places with low illumination, high position or difficult reading has a dial diameter of 150 mm or 250 mm.

Gauge China (GC) is a manufacturer of instruments founded by Mr. Weber and Mr. Robert Beer in 2001. It focuses on pressure gauges, thermometers, and engineering products. We serve a wide range of industries, including petrochemicals, pharmaceuticals, mining, food processing, medical, and OEM applications.

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