What does a transmitter output start from 3-15 psi or (0.2 - 1 Kg/Cm2) or 4 - 20 ma. etc. ?

What does a transmitter output start from 3-15 psi or (0.2 - 1 Kg/Cm2) or 4 - 20 ma. etc. ? 
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1 Answer

Answer :

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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