UMG70XV3-4EN 12.01.2009 83
10 Basic Measurement
• min. and max. sound velocity
• kinematic viscosity
•density
• gas compressibility factor
10.2.1 Sound Velocity
The sound velocity of the medium is used for the calculation of the transducer distance at
the beginning of the measurement. However, the sound velocity does not influence the
measuring result directly. Often, the exact value of the sound velocity for a medium is un-
known. A range of possible values for the sound velocity must therefore be entered.
These displays are indicated only if OTHER MEDIUM has been selected.
10.2.2 Kinematic Viscosity
The kinematic viscosity influences the flow profile of the medium. The entered value and
other parameters will be used for the profile correction. This display is indicated only if
OTHER MEDIUM has been selected or no data set for the selected medium is stored in
the flowmeter (e.g. natural gas).
10.2.3 Density
The mass flow will be calculated on the base of the density (product of volume flow and
density). This display is indicated only if OTHER MEDIUM has been selected or no data
set for the selected medium is stored in the flowmeter (e.g. natural gas).
10.2.4 Gas Compressibility Factor
The gas compressibility factor is needed for the calculation of the standard volume flow
(see section 11.1.1). Take care that the value is selected corresponding to the operating
pressure, the operating temperature and the composition of the gas. This display is indi-
cated only if OTHER MEDIUM has been selected or no data set for the selected medium is
stored in the flowmeter (e.g. natural gas).
Enter the min. and max. sound velocity of the medium.
Press ENTER after each input.
Enter the kinematic viscosity of the medium. Press EN-
TER.
Enter the operating density of the medium. Press EN-
TER.
Enter the gas compressibility factor. Press ENTER.
kinem. Viscosity
1.00 mm2/s
Gas compr.factor
1.000 factor
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