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User-defined calculation 2 (exponential) Equation 9-2:
y = e
(
A+
(
B×t
)
+
(
C×t
2
))
e
Natural logarithm
A, B, C
User-programmable constants
t
User-programmable constant or user-specified process variable
y
Result of calculation
User-defined calculation 3 (quartic) Equation 9-3:
y = A + B ×
(
ρ
B
ρ
W
)
+ C ×
(
ρ
B
ρ
W
)
2
+ E ×
(
ρ
B
ρ
W
)
3
+ F ×
(
ρ
B
ρ
W
)
4
A, B, C, E, F
User-programmable constants
⍴
W
Density of water at reference temperature and reference pressure, user-
programmable
⍴
B
Referred density from the concentration measurement application
y
Result of calculation
9.10.2 Measurement units used in user-defined calculations
The meter's internal measurement units are used for all process variables referenced by a
user-defined calculation. All constants must be entered in the internal measurement units
or derived using the internal measurement units.
Process variables and internal measurement unitsTable 9-1:
Process variable Internal measurement unit
Density g/cm³
Referred Density g/cm³
Mass Flow (external or calculated) kg/sec
Volume Flow (external or calculated) l/sec
Line Temperature °C
External Temperature °C
Board Temperature °C
Drive Gain %
Concentration %
Line Pressure Bar g
Dynamic Viscosity cP
Kinematic Viscosity cSt
Referred Viscosity and Secondary Referred Viscosity cP or cSt, depending on config-
uration
Measurement support
Configuration and Use Manual 157