A tire pressure gauge is an example of gauge pressure measurement when it indicates zero, then the pressure it is measuring is the same as the ambient pressure. Gauge pressure is zero-referenced against ambient air pressure, so it is equal to absolute pressure minus atmospheric pressure.Absolute pressure sensors are used in applications where a constant reference is required, like for example, high-performance industrial applications such as monitoring vacuum pumps, liquid pressure measurement, industrial packaging, industrial process control and aviation inspection. Absolute pressure is zero-referenced against a perfect vacuum, using an absolute scale, so it is equal to gauge pressure plus atmospheric pressure.When distinguishing between these zero references, the following terms are used: In other cases measurements are made relative to a vacuum or to some other specific reference. Natural gas pressure gauge silicon piezoresistive pressure sensorsĮveryday pressure measurements, such as for vehicle tire pressure, are usually made relative to ambient air pressure. Other methods of pressure measurement involve sensors that can transmit the pressure reading to a remote indicator or control system ( telemetry).Ībsolute, gauge and differential pressures - zero reference For very low pressures, a gauge that uses total vacuum as the zero point reference must be used, giving pressure reading as an absolute pressure. However, anything greater than total vacuum is technically a form of pressure. Most gauges measure pressure relative to atmospheric pressure as the zero point, so this form of reading is simply referred to as "gauge pressure". The widely used Bourdon gauge is a mechanical device, which both measures and indicates and is probably the best known type of gauge.Ī vacuum gauge is used to measure pressures lower than the ambient atmospheric pressure, which is set as the zero point, in negative values (for instance, −1 bar or −760 mmHg equals total vacuum). Instruments used to measure and display pressure mechanically are called pressure gauges, vacuum gauges or compound gauges (vacuum & pressure). Many techniques have been developed for the measurement of pressure and vacuum. Pressure is typically measured in units of force per unit of surface area. Pressure measurement is the measurement of an applied force by a fluid ( liquid or gas) on a surface. Example of the widely used Bourdon pressure gauge Checking tire pressure with a spring and piston tire-pressure gauge For tactile pressure sensors, see Tactile sensor. This article is about sensing gas or fluid pressure measurement.
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