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History of 3-15 psi, 10-15 mA, and 4-20 mA signals

S Bharadwaj Reddy
Before 4-20 mA the signals were 3-15 psi and 10-50 mA. These signals all have a “live zero” (3 psi, 10 mA, and 4 mA) rather than a “dead zero”

Why 4-20 mA Standard is so popular ?

S Bharadwaj Reddy
4-20 mA Standard 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

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