FMC Technologies Proline Promass 83 E - Function Description

Issue/Rev. 0.2 (12/12)
Page 128 • MN0M023
9 Block BASIC FUNCTION Device Functions Proline Promass 83
VALUE REFERENCE
TEMPERATURE
(6464)
! Note!
This function is not available unless the CALCULATED REFERENCE DENSITY setting
was selected in the CORRECTED VOLUME CALCULATION function (6460).
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:
U
N
= U · (1 + D't + E't
2
) ; 'where t = t - t
N
U
N
= Reference density
U currently measured fluid density (measuring value Promass)
t = Actual measured temperature of fluid (measuring value Promass)
t
N
= Reference temperature for calculating the reference
density (e.g. 20 °C)
D = Volumetric expansion coefficient of the fluid,
Unit = [1/K]; K = Kelvin
E = Square volumetric expansion coefficient of the fluid, unit = [1/K
2
]
Function description
BASIC FUNCTION o PROCESS PARAMETER o REFERENCE PARAMETER