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Why do we use a standard of 4-20 mA ?

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Question added by Ahmed Yasein Skaik , Project Site Manager , NUBDAA Trading and Contracting Co.
Date Posted: 2016/01/30
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Wahab Ahmed Siddiqui
by Wahab Ahmed Siddiqui , Administration , Abn Soft

A 4-10mA corresponds to a 1-5V analog voltage across a 250 Ohm resistor, making it easy to adapt the 4-20mA current loop to a 1-5VDC analog input voltage (common on many controllers using TTL inputs) to by simply placing a 250 Ohm resistor across the analog input terminals of the controller.

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