Endress+Hauser Proline Promass 83 - Page 123

Device Functions Proline Promass 83 FOUNDATION Fieldbus 3 Transducer Block
Endress+Hauser 123
Ref.Param. -
Exp. Coeff.Lin.
AUTO - OOS
! Note!
The entry is not active unless the CALC. REF. DENSITY option was selected
in the parameter "Reference Param. - Cor. Volume Calc.".
For calculating temperature-compensated density functions, an expansion
coefficient specific to the fluid is required which you can enter in this
parameter.
User input:
5-digit floating-point number
Factory setting:
0.5000 e
-3
[1/K]
Ref.Param. -
Exp.Coeff.Square
AUTO - OOS Use this parameter to enter a squarely expansion coefficient, if the
temperature compensation follows a nonlinear behavior.
User input:
5-digit floating-point number
Factory setting:
0 e
-6
[1/K
2
]
Ref.Param. - Ref.
Temperature
AUTO - OOS
! Note!
This parameter is not active unless the CALC. REF. DENSITY option was
selected in the parameter "Ref.Param. - Corr. Vol.Calculation".
For entering the reference temperature for calculating the corrected volume
flow, the corrected volume and the reference density.
Options:
5-digit floating-point number
Factory setting:
20.000
The reference density is calculated as follows:
ρ
N
= ρ · (1 + α Δ t + β Δ t
2
) ; where Δ t = t – t
N
ρ
N
= Reference density
ρ = Currently measured density (Promass measured value)
t = Currently measured fluid temperature (Promass measured value)
t
N
= Reference temperature at which the reference density should be
calculated (e.g. 20 °C)
α = Volumetric expansion coefficient of the fluid in question, unit = [1/K];
K = Kelvin
β = Quadratic volumetric expansion coefficient of the fluid in question,
unit = [1/K
2
]
Reference Param. -
Ref. Temperature
Unit
AUTO - OOS Displays the unit used for the temperature in the calculation of
corrected volume flow.
! Note!
The unit is taken from the parameter "System Unit - Temperature"
( → Page 117).
"Flow" Transducer Block / base index 1400:
Parameter
Write access
with operating
mode
(MODE_BLK)
Description