Answer / nilesh

Normally there is a P&I( Process and Instrumentation)
diagram not E&I diagram.In P&ID circle symbole related to
field mounted instrument while Square box with circle
inside is related to function in DCS.There is number of
other symbole in each catagory.

Answer / ganesh prajapati

In P&ID, ESD signal is represented by a triangle with ESD
mentioned inside a triangle.

Answer / d das

ok mr. nilesh. but which one is ESD signal how should we
know? in a P&ID drawing.

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