7 Block BASIC FUNCTION Device Functions Proline Promass 83 FOUNDATION Fieldbus
56 Endress+Hauser
EXPANSION
COEFFICIENT
(6462)
! Note!
This function is not available unless the CALCULATED REFERENCE DENSITY setting
was selected in the CORRECTED VOLUME CALCULATION function (6460).
For calculating temperature-compensated density functions, an expansion coefficient
specific to the fluid is required which you can enter in this function (see VALUE REF.-
TEMP. (6464) function).
User input:
5-digit floating-point number
Factory setting:
0.5000 e
-3
[1/K]
EXPANSION
COEFFICIENT SQUARE
(6463)
Use this function to enter a square expansion coefficient if the temperature
compensation follows a nonlinear behavior (see VALUE REF-TEMP. function (6464)).
User input:
5-digit floating-point number
Factory setting:
0 e
-6
[1/K
2
]
REFERENCE
TEMPERATURE
(6464)
! Note!
This function is not available unless the CALCULATED REFERENCE DENSITY setting
was selected in the CORRECTED VOLUME CALCULATION function (6460).
For entering the reference temperature for calculating the corrected volume flow, the
corrected volume and the reference density.
User input:
5-digit floating-point number
Factory setting:
20.000 °C
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 fluid density (measuring value)
t = Currently measured medium temperature (measuring value)
t
N
= Reference temperature for calculating reference density (e.g. 20 °C)
α = Volumetric expansion coefficient of the fluid. Unit = [1/K]; K = Kelvin
β = Square volumetric expansion coefficient of the fluid. Unit = [1/K
2
]
Function description
BASIC FUNCTION → PROCESS PARAMETER → REFERENCE PARAMETER
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