Revision 2.0 FOUNDATION Fieldbus ST 700 Pressure Transmitter User's Guide Page 79
The following function types are supported:
1. Flow compensation, linear. Used for density compensation of volume flow.
2. Flow compensation, square root. Usually, IN_1 is pressure, IN_2 temperature, and IN_3
is the compressibility factor Z.
3. Flow compensation, approximate. Both IN_2 and IN_3 would be connected to the same
temperature.
4. BTU flow, where IN_1 is inlet temperature, and IN_2 the outlet temperature.
5. Traditional Multiply Divide
6. Average
f = number of inputs used in computation (unusable inputs are not used).
7. Traditional Summer
8. Fourth order polynomial. All inputs except IN_LO (not used) are linked together.
9. Simple HTG compensated level, where PV is the tank base pressure, IN_1 is the top
pressure, IN_2 is the density correction pressure, and GAIN is the height of the density tap.
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