Shema Tokovaja Petlja 4 20 Ma -

Two wires for power (+ and -) and one shared wire for the signal.

Complete electrical isolation between power and signal. ✅ Why Use 4-20 mA?

The 4 mA floor allows the system to distinguish between a "zero" reading and a broken wire (0 mA). 🛠️ Main Components A functional circuit consists of four essential parts: Sensor/Transducer: Measures the physical variable. shema tokovaja petlja 4 20 ma

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.

If the wire snaps, the current hits 0 mA, immediately triggering a "fault" alarm. Two wires for power (+ and -) and

Handles power-hungry sensors (e.g., gas detectors). 4-Wire Connection (Fully Isolated)

Typically 24V DC to drive the current through the loop. The 4 mA floor allows the system to

Converts the sensor signal into the 4-20 mA current.