KROHNE ALTOSONIC V EN - Manual (Page 24)

ALTOSONIC V
Operating Manual rev02 E 7.30850.34.00 Page 24 of 106
that the factor is used in the flow calculation. The correction is lineair and depends on meter
construction.
For example correction per 100 Bar difference for:
•
a certain ALTOSONIC V 6 inch construction is about +0.04%
•
a certain ALTOSONIC V 10 inch construction is about +0.045%
As this is a linear function the correction at 50 Bar difference would be half the value (0.02%).
This was calculated using the standard: ISO/CD 17089/1
The correction is described in different standards. To be compliant with these different standards
KROHNE as made the choice to put the correction in a general formula:
) (
100
1
ref proces
pb
pb
P P
C
K − ⋅ + =
K
bp
: Correction factor used for the pressure expansion
C
bp
: Lineair pressure correction factor [%/bar], depending on the construction and used standard.
P
proces
: Pressure proces[bar]
P
ref
: Pressure reference [bar],
Note that P expansion correction is disabled at that time, or used pressure is low.
STANDARD VOLUME CORRECTIONS shows:
•
The temperatures, pressures and densities at proces, standard, densitometer and optional
external flow meter conditions in relation to the correction factors Ctl and Cpl
•
The correction factors Ctl (temperature correction to 15°C) and Cpl (pressure correction to
1.01325 bar, or 0 barg)
See chapter 5 for more information on the Standard Volume correction