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Digital pressure gauges measure the pressure within a system in a special manner. They convert the pressure to an electronic signal. The gauge shows the pressure using a digital display, furthermore the signal can be used to control equipment. Digital gauges in comparison with analog ones have a higher accuracy. Read our article on analog pressure gauges if you want to learn more about that type.
Digital pressure gauges make use of pressure sensors in order to convert pressure to an electronic signal. Different types of pressure sensors exist, but the most commonly used is a piezoresistive pressure sensor. This sensor consists out of a diaphragm that is equipped with piezoresistive elements. The medium pressure causes the diaphragm to deflect, this deflection causes a change in cross-sectional area of the piezoresistive elements that is directly coupled to the electrical resistance. For a more in depth explanation please read our article on electronic pressure measurement principles.
Next to a higher level of measurement accuracy digital pressure gauges offer options that are not available for analogue ones. A few examples of possible options are:
Read our selection tips for pressure gauges to learn more about this subject. For more information on various pressure gauges read our articles on bellows pressure gauges, diaphragm pressure gauges, or bourdon tube pressure gauges.
The accuracy of digital pressure gauges is expressed as a percentage of the measurement span. The accuracy of these gauges is combined from it’s non-linearity, hysteresis, End value deviation, zero offset and span error. For a detailed explanation please read our article on understanding pressure measurement accuracy.