Can run hundreds of meters without signal loss (unlike voltage, which drops over distance).
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) shema tokovaja petlja 4 20 ma
A device like a PLC or indicator that reads the signal, usually by passing the current through a 250 Ohm resistor to create a 1-5V drop for processing. 📐 Connection Types (Wiring Schemes) 2-Wire Connection (Passive) Can run hundreds of meters without signal loss
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. Benefit: Saves cable costs and simplifies installation
Two wires for power and two separate wires for the 4-20 mA signal.
Handles power-hungry sensors (e.g., gas detectors). 4-Wire Connection (Fully Isolated)
The sensor has its own dedicated power source (often AC or high-voltage DC).