Answer / banerjeenandan

Your transmitter has a range of 800mmhg. The LRV is -400mmhg
and URV is +400mmhg. So at atmosphere you will get 12mA. all
the time, because atmosphere is Zero gauge pressure
(perfectly mid value in between the LRV and URV).

If you do zero trim at atmosphere, it will take "ZERO" with
the atmospheric pressure. The range of the transmitter will
not change. The range will remain 800mmhg. But your LRV will
change to 0mmhg and URV will change to +800mmhg. So in that
case, without any process connection it will give 4mA.

Answer / senthil.doosan

-400mmhg= -0.53bar
400mmhg = +0.53bar
if u do zero trim by opening the valves with respect to atm
the output of the transmitter is 12ma
without any process connection the output is 4ma

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