INSTRUMENTATION ENGLISH LECTURES WITH ANIMATION - Why Do Instruments Use 4–20 mA Instead of 0–20 mA? #instrumentationengineering #controlengineering

In industrial process plants, process instruments use 4–20 mA current signals instead of 0–20 mA for reliable and accurate signal transmission. But why does the signal start from 4 mA instead of zero? In this video, we explain the practical engineering reasons behind the 4–20 mA current loop, including live zero, fault detection, noise immunity, and why it became the industry standard in instrumentation and control systems like PLC and DCS. Perfect for students and professionals learning industrial instrumentation and process control. #Instrumentation #ProcessControl #420mA #IndustrialAutomation #PLC #DCS #InstrumentationEngineering #ControlSystems