Why 4-20ma is used as signals in process control? why not 0-10 0r 0-20?

Question added by AJEESH MADHU M S
Date Posted: 2013/12/02

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by mohamed Abd El Rahman , Proposal Development / Pre-Sales Manager , RMS Engineering - KROHNE Agent in Egypt

Thats logical because if its a0-10 or0-20ma signal you cant tell if the (0 ma) is due to an open circuit or a cut wire or low signal ; so they used the4-20ma so to be able to diffrentiante between a low signal (4 ma) or an open circuit (0 ma).

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Why 4-20ma is used as signals in process control? why not 0-10 0r 0-20?

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