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Answer Posted / jobby johnson
4-20ma and 3-15psi are the international standards following every where.clearly the range 0-4ma and 0 to 3psi are called live zero. hence we are not using it in signal transmission
y mainly 4-20ma. this is because all the electrical signals from a controller(electronic) should go to a final control element.most probably in process industries it will be a control valve, which accepts 3-15psi. so it is very easy to calibrate a 4-20ma current signal into 3-15psi with the help of i/p converter..moreover 4-20ma range possess good linearity
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