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In calibration of transmitters why use 4ma o/p for zero signal?why can't we use 1,2or3 as starting o/p or signal?

Calibration
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Question added by AKHIL MEENA PRASAD , Probation Engineer , IPA PVT LTD
Date Posted: 2014/11/28
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Ravi Chandra Penumarti
by Ravi Chandra Penumarti , Dy.Manager (Instrumentation) , The Andhra Petrochemicals Limited

Dear Akhil

Any leakage or induced current in the transmitter loop will be less than4mA.

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