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The system translates a physical measurement (like pressure or temperature) into a current signal between 4 mA and 20 mA. Represents the 0% or minimum value of the range. 20 mA: Represents the 100% or maximum value of the range.
The sensor has its own dedicated power source (often AC or high-voltage DC). shema tokovaja petlja 4 20 ma
The most common setup where the transmitter is powered by the loop itself. Two wires carry both power and the signal. Benefit: Saves cable costs and simplifies installation. 3-Wire Connection (Active) The system translates a physical measurement (like pressure