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  • what is need of 4 to 20miliampear & 0 to 20miliampear

    ajay mogle

    ajay mogle

    @ajay-mogle-tR2YZr
    Updated: Aug 13, 2012
    Views: 9.6K
    so many controllers output is of 4 to 20 ma whearas some of them has 0 to 20 ma output why
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  • arunfbd2012

    Member • Aug 15, 2012

    the digital signals work on standard 0-5v , so having a 4-20ma and a 250 ohm resistance we can output a 0-5v range from the controllers.
    But if 0-20ma is used, where 0ma for minimum value and if there is a failure in the transmitter wire,say it is grounded then the value read is 0ma again, so to identify this failure Industries now mostly stick to 4-20ma .
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  • Harshad Italiya

    Member • Aug 15, 2012

    ajay mogle
    so many controllers output is of 4 to 20 ma whearas some of them has 0 to 20 ma output why
    Can you please let me know where you read this ? I mean in datasheet or anywhere else? As I know this 0 might be referred to Input only pin of Controller.
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  • arunfbd2012

    Member • Aug 15, 2012

    visit#-Link-Snipped-#
    You will get a better insight.
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