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why we used for range in pnumatic 3-15 psi and current 4-20
ma?
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Answer Posted / biju antony
The transmitter output stance from what is known as "live zero". This system has
specific advantages :
1. The systems automatically alarms when the signal system becomes inoperative.
2. The output areas is linear ( Ratio of 1 : 5 ).
DEAD ZERO SIGNAL :
The advantage is that it does not have to be biased to true zero. A "Live zero" gives the
computer additional information, so that it can takes appropriate alarm action in case of a
measurement failure, because it can discriminate between a transmitter operating, but
transmitting a zero measurement and a failure, in the signal system.
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