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Pressure Ranges. ASME B40.100 recommends that a gauge with a full scale pressure range of approximately twice the normal operating pressure be selected. The maximum operating pressure should not exceed 75% of the full-scale range. Failure to select a gauge within these criteria may ultimately result in fatigue failure of the pressure sensor ...
- Digital vs analog reading. Various digital and analog pressure gauges are available, making each type suitable for most pressure reading tasks. Use the chart below for a general comparison between the two types.
- Gauge type. There are many types of pressure gauges. The following are common types: Bourdon tube: A bourdon tube gauge is the most widely used pressure gauge with a wide range of designs and excellent sensitivity and accuracy.
- Pressure gauge material. When making decisions about the material, there are two parts of a pressure gauge to consider: the cabinet and the process connection.
- Fluid temperature. The pressure gauge components must be able to withstand the media’s temperature. For gauges that work with hot media, it is recommended that the gauge be used along with a siphon, cooling tower, or diaphragm seal.
Sep 13, 2021 · Learn the factors to consider when choosing the pressure range for your gauge, such as operating and design pressure, dial size and features, scale options and accuracy. See examples of different gauge scales and customization options.
- Size. Mechanical pressure gauges come in a variety of nominal sizes, and the one you choose depends on your requirements for readability, space, and precision.
- Temperature. Both the ambient temperature and media temperature will determine the material of the wetted parts (brass, stainless steel, nickel alloy, etc.)
- Application. Basically, in what industry will the gauge be used? Here are some examples: Gauges for drinking water applications need to be lead-free, while process industries like refineries and pharmaceuticals require industrial process gauges.
- Media. The media that the pressure gauge, especially its wetted parts, comes in contact with will determine the gauge material. In other words, what’s in the pipeline?
- Choosing the correct measurement range. The scale range must be chosen so that the measured process pressure is between 1/3 and 2/3 of the scale range.
- The scale unit. There are numerous units available for measuring pressure. A small selection from the range of possibilities: bar, mbar, Pa, kPa, MPa, psi, mmH2O, inHg …
- The accuracy of the measurement. The accuracy is chosen according to the application and can vary from 0.1 to 5%. If the intention is only to have a rough idea of the pressure at a specific position in the process, it is not necessary to have high accuracy.
- The size of the dial. The selection of the dial size depends on the desired accuracy and the application for which the pressure gauge is used. A dial with a larger diameter has more intermediate graduations so that the measured pressure can be read more accurately.
7. PRESSURE RANGES ASME B40.100 recommends that normal operating pressure be confined to 25%-75% of the scale. If pulsation is present in the process, maximum operating gauge pressure should not exceed 50% of the full-scale range. CONCLUSION To properly select a pressure gauge, consider the gauge process, range, environment, accuracy, dial
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Jun 14, 2023 · While standards varied per industry, the following are typical guidelines: Accuracy of test gauges and standards: 0.25% to 0.10% whole scale. Critical Processes: full-scale accuracy of 0.5%. 1.0% accuracy in most industrial processes. Less Important Commercial Applications: 2.0% accuracy.
