4-20mA transmitters are transducers that respond to a measured variable by means of a sensing element and convert it to a standardized transmission signal (like 4-20mA) that is a function only of the measured variable.
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Sensors are input devices that provide a usable output in response to the input measurand. It also commonly called a sensing element, primary sensor and primary detector. The measurand is the physical parameter to be measured.
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