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Formula to Calculate Process Variable from 4-20mA

S Bharadwaj Reddy
Calculate equivalent Process variable from 4-20mA Formula : First Calculate equivalent Percentage from 4-20mA signal Percentage = ( X * 6.25 ) – 25 Then calculate equivalent Process variable from

Formula to Calculate 4-20 mA from Process Variable

S Bharadwaj Reddy
Calculate the equivalent 4-20mA signal from Porcess Variable. Formula : First calculate equivalent percentage from the process variable Percentage = ( X – LRV / URV – LRV ) .

Why 4-20mA Standard is so popular ?

S Bharadwaj Reddy
4-20mA has an inherent ‘live zero’. Zero engineering units is 4.0mA, not 0.0mA. 0.0mA indicates an open circuit, a failure or a fault mode like cut wires or a dead

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