How a 2 Wire Transmitter 4 – 20mA Current Loop Works

By Anonymous -
In two-wire 4-20mA control loops which are the most popular these days, the 2-wire transmitters convert various process signals representing flow, level, temperature, pressure, etc., to 4-20mA DC current for the purpose of transmitting the signal over some distance with little or no loss of signal.

Relationship between the Components in the 4 – 20mA Control Loop
There are three key components in the 4 – 20mA loop as shown below:

They are:
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