Emerson Rosemount OCX8800A - Page 202

This calculation is done by applying the level signal to the IN connector, the liquid
temperature to the IN_1 connector, and the ambient air temperature to the IN_2
connector. Select the arithmetic type (ARITH_TYPE) of flow compensation - linear.
This allows a ratio to be set up that increases the level indication at a block output
for an increase in the tank temperature relative to ambient temperature.
Figure 8-27: Arithmetic Function Block Diagram Example
A. Tank level
B. Liquid temperature
C. Air temperature
D. In
E. In_1
F. In_2
G. Arithmetic block
H. Out
I. Arithmetic type = flow comp-linear
This application can be applied to very large storage tanks whose contents are
subject to thermal expansion and contraction during seasonal changes in
temperature.
FOUNDATION
™
Fieldbus Manual
December 2022 00809-0500-4880
202 Emerson.com/Rosemount