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Do you know how to choose a pressure gauge correctly?

There are many variants of specific pressure gauges for each situation. For this, buyers can orient themselves with some of the following characteristics

1. Size

The dial diameter of a typical manometer ranges from 6.4 cm to 15.2 cm. It should be chosen based on your own requirements for legibility, space and precision. Additionally, the size of the final connection is also important and will determine what size gauge is required.

2. Temperature

The temperature of the medium conditions the materials of the manometer in contact with the environment (brass, stainless steel, nickel alloy, etc.). For that reason, the lower the ambient temperature, a liquid-filled meter is probably the right choice. On the contrary, if the outside temperature exceeds 60ºC, you should choose stainless steel.

3. The application

The type of industry where the device is located also determines its characteristics.

Meters for drinking water applications must be lead-free, while process industries such as refineries and pharmaceuticals require industrial process instruments. Cryogenic gas tanks require both differential and service pressure to be measured, and for oxygen service, they must be clean of oils and greases. Pressure gauges used in sanitary processes must be hygienic. The highly aggressive gases used in the semiconductor industry mean these applications require ultra-high purity (UHP) pressure gauges. Additionally, some applications require special approvals.

4. The middle

The medium in contact with the manometer determines the material with which it is designed.

A brass (copper alloy) pressure gauge is suitable for water, air or other non-aggressive liquids or gases. However, acid gas (hydrogen sulfide), ammonia, creosote and other harsh chemicals require corrosion-resistant materials such as stainless steel or a nickel-copper alloy.

In turn, the medium also affects the filling of the box. Glycerin is the standard fill fluid for non-oxidizing environments, while highly reactive media requires an inert oil.

5. The pressure

The type of pressure gauge depends on the measurement: relative pressure, absolute pressure or differential pressure.

The operating range of the application must also be taken into account. Generally, a pressure gauge whose range is 2 times the optimal operating pressure should be selected, as this ensures the best performance. Standard pressure gauges can work up to 20,000 psi (1,600 bar), and special ones can work up to 87,000 psi (6,000 bar). For low-pressure measurements, a capsule manometer detects small pressure differences in millibars (mbar), millimeters of water column (mmH2O), or ounces per square inch (oz/in2).

At Disumtec we offer you a wide range in which you will find the most suitable solution