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.
= √ (_1)×(_2)×(_3)×(_3) × []
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.
Rev.5
= ×
(_1)
=
(_2)
= ×
(_1)
(_2)
√
=
(_3)
= ×
= ×
= (_1 − _2) × []
= ×
(_1)
=
+ (_3)× []
(_2)
( + ( _1 ) + ( _2 ) + (_3))
=
= + ( _1 ) + ( _2 ) + (_3)
= PV + (_1)
FOUNDATION Fieldbus Option User's Manual
× []
× []
2
3
4
+ (_2)
+ (_3)
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