There are also different types of pressure to consider. Other units of measure include kg/cm2, inH2O, mmHg, Pa, and many others. We will see PSI ( pounds per square inch) or bar. Pressure sensor is a catch-all term that includes both pressure transmitters as well as pressure transducers.Īs pressure is defined as force over a unit area, there are a number of ways to articulate pressure readings depending upon the unit of force and the unit of area. They are also sensitive to electromagnetic interference. Transducers areīetter for short runs as electrical resistance can cause errors on longer runs. Pressure transducers are voltage output devices that, generally, have three or four wires to power the device as well as transmit the output signal. Transmitters are ideal for longs runs as wiring is simpler and cheaper and there is no significantĭegradation of the output signal with distance. They are often scaled from 4-20 mA although other ranges are available. Pressure transmitters are current output devices that, generally, have two or three wires that are used to both power the device as well as transmit the output Transducers are the class of instruments which convert applied pressure into a measurable electrical signal which can be used for display or to trigger a control function.Īlthough many users-and even some manufacturers- use the terms sensors, transmitters and transducers interchangeably, technically there are differences between them. Usually involving liquids and gases, pressure is a critical component of a diverse array of applications,īoth those that rely on accurate pressure control as well as those that derive other values (such as depth/level or flow) based upon pressure. Pressure is defined as the amount of force applied over a unit area.
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