If you need a for a specific microcontroller like an Arduino or PLC.
If the wire snaps, the current hits 0 mA, immediately triggering a "fault" alarm.
Current signals are less affected by electromagnetic interference (EMI) than voltage signals.
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.
Can run hundreds of meters without signal loss (unlike voltage, which drops over distance).
Two wires for power and two separate wires for the 4-20 mA signal.
