In close vessel/ drum why we use d.p. transmitter of -ve
range i.e. (-)500 to 0 mmwc.

Answer Posted / ayaz

IN CLOSE VESSEL/DRUM
we use wet leg mean(low impulse line fill with same liquid)
we know that our measurement is when right then dp is creat
and when we use without low side filling  and hp side only pressure the steam create pressure on lp side so dp not create and show wrong indication
so we use fill lp side pressure and address in negative and when hp side posative or actual pressure create a dp in right indication will show

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