Re: [foxboro] CALC-SG

If you know the calculations for the temperature compensation, yes, you can
use a CALC block to calculate the true specific gravity. Otherwise, if all
you have is a curve, you can convert that data into a series of X,Y
coordinates and use a CHARC block to do the same compensation.

In either case, instead of a constant for your specific gravity, you will
use an .OUT connection from either the CALC block or the CHARC block.

Hope this is what you're looking for.

Duc

-- 
Duc M. Do
Dow Corning Corp.
Carrollton Plant
Carrollton, KY, US


-----Original Message-----
From: Ghodhbani, Hafedh [mailto:hafedh.ghodhbani@xxxxxxxxxxxx]
Sent: Thursday, December 27, 2001 4:14 AM
To: foxboro@xxxxxxxxxxxxx
Subject: [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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