why 4-20 mA signal is preferred over a 0-10V signal
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Answer Posted / banibrata
In case of voltage transmission(here 0-10V)
1.there will be voltage drop along the transmission wire.
2.if we use 0 volt then we will be unable to find whether
the obtained 0 volt output is really the system output or
its due to instrument error.So for "live zero" concept we
need to give a particular value(other than zero) in the
lower range value.
3.Capacitive and magnetic effect due to voltage
transmission will be more than that in case of current
transmission.
4.2-wire transmission is not compatible with voltage
transmission.
But in case of 4-20 mA signal the above problems are solved.
1.In series transmission same current flows through the
ckt.So no current drop occurs.
2.Here the lower range value is 4 mA.So we can easily
detect after looking at the o/p whether the instrument
error occurs or not.In case of instrument error zero
reading will be shown.
3.2-wire transmission is compatible with it.
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