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Device Functions Proline Promag 55
3 Block MEASURED VARIABLES
Hauser
21
3.3.2
Function group DENSITY PARAMETER
MEASURED
VARIABLES
A
⇒
MEASURING VALUES
AAA
⇓
SYSTEM UNITS
ACA
⇓
SPECIAL UNITS
AEA
⇒
ARBITRARY UNIT
060
⇓
DENSITY PARAMETER
070
Function description
MEASURED VARIABLES
➞
SPECIAL UNITS
➞
DENSITY PARAMETER
Use this function group to calculate a mass flow from a volume flow. The thermal expansion of the fluid can be
compensated if the measuring device is provided with the fluid process temperature by means of a current input.
!
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] x 0.900 [kg/l] = 0.900 [kg/h] (mass flow at 20 °C)
= 1 [dm
3
/h] x 0.783 [kg/l] = 0.783 [kg/h] (mass flow at 150 °C)
Example of calculated mass flow with compensation for thermal expansion of the fluid:
= Mass flow [kg/h]
= Volume flow = 1 [dm
3
/h]
= Density value = 0.9 [kg/ l], see function DENSITY VALUE (0700)
= Reference temperature = 20 [°C], see function REFERENCE TEMPERATURE (0701)
= Process temperature of the fluid = 150 [°C] via current input
= Vol. expansion coefficient = 1 x 10
–3
[1/K], see function EXPANSION COEFFICIENT (0702)
→
= 0.783 [kg/h]
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 18).
m
·
V
·
ρ
⋅
=
m
·
V
·
ρ
⋅
=
m
·
V
·
ρ
T
Ref
T
Pro
ε
m
·
V
·
ρ
1
ε
T
Pro
T
Ref
–
(
)
⋅
+
------------------------------------------------
⋅
=
m
·
Содержание Proline Promag 55
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