Group Special Units; Function Group Density Parameter - Endress+Hauser Proline Promag 55 Operating Manual

3 Block MEASURED VARIABLES
14
3.3 Group
SPECIAL UNITS
3.3.1

Function group DENSITY PARAMETER

MEASURED
⇒
A
VARIABLES
MEASURED VARIABLES
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:
· · ⋅
⋅ ρ 3
m = V = 1 [dm /h] 0.900 [kg/l] = 0.900 [kg/h] (mass flow at 20 °C)
· · ⋅
⋅ ρ 3
m = V = 1 [dm /h] 0.783 [kg/l] = 0.783 [kg/h] (mass flow at 150 °C)
·
m = Mass flow [kg/h]
·
3
V = Volume flow = 1 [dm /h]
ρ
= Density factor [kg/ l], see DENSITY VALUE function (0700)
DENSITY Use this function to enter a density value preferably at process temperature (or at
VALUE (0700) 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]
!
The appropriate unit is taken from the function UNIT DENSITY (0420), (see Page 13).
Device Functions Proline Promag 55 FOUNDATION Fieldbus
MEASURING VALUES AAA
⇓
SYSTEM UNITS ACA
⇓
SPECIAL UNITS AEA
Function description
→ →
SPECIAL UNITS
Note!
⇒
DENSITY PARAMETER
DENSITY PARAMETER
Endress+Hauser
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