4 to 20ma is used for Signal Transmission in Instrumentation.
The 4-20 mA current loop has been the standard for signal transmission and electronic control in control systems
a 4-20 mA current loop is a very common method to convey the sensor data acquired.

As major as the 4-20 mA loop standard has become in the process control industry, many do not understand the fundamentals of its setup and use.
Not knowing the basics could potentially cost you money when it comes time to make decisions about process display and control.

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