why we are called the 4-20ma transducer,not 0-20 ma
transducer??
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Answer Posted / vaseekaran
Let us keep the value as 0 to 20 mA,
The valve we measure in the output will be zero if the meter is in idle state and also it will show the same zero even the instrument is in fail condition.so we cannot get the exact and get confused if there is a problem in instrument while cross checking.this is the reason we are using 4 to 20mA.if the instrument fail then we can get only zero and if the instrument is idle we will get 4mA.so we can easily differentiate it.
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