The minimum recognized current level for an operating current loop in industrial control circuits is 4mA.
Current loops are used to control the DC and quadrature line currents Id and Iq, respectively, which allow the active and reactive powers to be controlled. The 4-20mA current loop is the dominant process control signal in many industries. It is an ideal method of transmitting process information as the current does not change as it flows from the transmitter to the receiver.
It's also much easier and cheaper. A 4-20mA current loop output is a type of electrical signal used in a series circuit to provide a robust measurement signal. There are two common control loop systems used in industrial processes. They are open-loop and closed-loop systems. A control loop is a system used by designers in various industrial applications to maintain a process variable at a desired or set value.
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