Accuracy of pressure gauge
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How is the accuracy of a pressure gauge determined?
Accuracy is determined by calibration by metrological institutions. For specific details, refer to JJG52-1999 for spring-type general pressure gauges, pressure-vacuum gauges, and vacuum gauges
The accuracy class of a pressure gauge is determined by the maximum allowable measurement error for production and the gauge’s range.
General pressure gauges GB/T 1226-2001$ e- I8 v! e j0 ^; ]# p What are the accuracy grades of pressure gauges? Grade 5.0, Grade 3.0, Grade 1.5, Grade 1.0, Grade 0.5, Grade 0.1, and so on. The maximum error is 5% to 0.1%. For example, the error of a 1.5 grade gauge at 10 Mpa is 0.15 Mpa. How to choose? Pressure vessels generally use grade 1.5, which is sufficient in terms of accuracy. There is also the issue of range; for pressures that remain relatively stable, it is best if the actual pressure is around 66% of the range value. It is better for the pressure fluctuation to be between 30-40%. - Ordinary meter calibration usually uses class 0.5 instruments. If it is for calibrating instruments at the next higher level, such as for value transfer, a 0.1 grade is required.
Its accuracy is governed by standards, including national standards as well as European, American, and British standards. . .
The accuracy of a pressure gauge, that is, its precision, is expressed as the percentage of the allowable error of the gauge relative to the maximum value on its scale； For example, a pressure gauge with an accuracy class of 1.5 has an allowable error of 1.5% of the maximum value indicated on its scale ； It can be seen that for pressure gauges with the same accuracy level, the larger the range, the greater the allowable absolute error; therefore, an appropriate range should be selected depending on the operating pressure ； The general principle is to use a pressure range that does not exceed 70% of the scale limit; in the presence of pressure fluctuations, it should not exceed 60%. For reference!
The accuracy of a pressure gauge corresponds to its range of use; there are significant differences between those used in industry or laboratories and those used as standard gauges in calibration rooms, and the choice depends on the intended application.
Determine the required accuracy of your pressure gauge based on your production needs
The accuracy class of a pressure gauge is the percentage of its maximum allowable error. For the commonly used Class 1.5, the maximum allowable error is 1.5%.