Can run hundreds of meters without signal loss (unlike voltage, which drops over distance).
Current signals are less affected by electromagnetic interference (EMI) than voltage signals. shema tokovaja petlja 4 20 ma
Complete electrical isolation between power and signal. ✅ Why Use 4-20 mA? Can run hundreds of meters without signal loss
Two wires for power and two separate wires for the 4-20 mA 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.
If the wire snaps, the current hits 0 mA, immediately triggering a "fault" alarm.
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.