Introduction - pressure measurements Pressure sensors are relatively common as there are in excess of 30 pressure transducer manufacturers in the United States.
Pressure measurements are less common in home and small business applications.
Pressure measurements may be divided into two classes - absolute and differential. Absolute pressure transducers measure the pressure on the sensor relative to a vacuum. Relative pressure, or differential pressure, is the pressure difference between two ports - for example the pressure gained between the inlet and outlet pipes of a pump. Since pressure is measured internal to a pipe or tank, the vast majority of sensors require an installation that involves some plumbing. The electronic measurement of pressure is accomplished using a variety of technologies including piezoresistive, in which the resistance of a sensor element changes with pressure.