[foxboro] CALC-SG

Hi list,
I have installed tank level transmitter. It is really a pressure transmitter

that is measuring the head pressure of the liquid, and converts it into
level.
i have accuracy problem due to the variation of specific gravity with
temperature.
I would like to put a CALC block that corrects this variation.
the liquid is condensate (oil).
Please advise   

hafedh ghodhbani
control and instrument engineer
british gas tunisia

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