Endress+Hauser Proline Promag 55 - Group SPECIAL UNITS; Function Group DENSITY PARAMETER

3 Block MEASURED VARIABLES Device Functions Proline Promag 55 FOUNDATION Fieldbus
14 Endress+Hauser
3.3 Group SPECIAL UNITS
3.3.1 Function group DENSITY PARAMETER
MEASURED
VARIABLES
A ⇒ MEASURING VALUES AAA
⇓
SYSTEM UNITS ACA
⇓
SPECIAL UNITS AEA ⇒ DENSITY PARAMETER 070
Function description
MEASURED VARIABLES → SPECIAL UNITS → DENSITY PARAMETER
Use this function group to calculate a mass flow from a volume flow.
! Note!
It is advisable to enter the density factor at process temperature for calculating the mass flow without compensating for
thermal expansion.
Example of calculated mass flow without compensation for thermal expansion of the fluid:
= 1 [dm
3
/h] ⋅ 0.900 [kg/l] = 0.900 [kg/h] (mass flow at 20 °C)
= 1 [dm
3
/h] ⋅ 0.783 [kg/l] = 0.783 [kg/h] (mass flow at 150 °C)
= Mass flow [kg/h]
= Volume flow = 1 [dm
3
/h]
= Density factor [kg/ l], see DENSITY VALUE function (0700)
DENSITY
VALUE (0700)
Use this function to enter a density value preferably at process temperature (or at
reference temperature). This density value is used to convert the volume flow to a mass
flow.
User input:
5-digit floating-point number
Factory setting:
1 [unit]
! Note!
The appropriate unit is taken from the function UNIT DENSITY (0420), (see Page 13).
m
·
V
·
ρ⋅=
m
·
V
·
ρ⋅=
m
·
V
·
ρ