Bronkhorst EX-FLOW Mass Flow Bedienungsanleitung PDF herunterladen (Seite 10)

BRONKHORST HIGH-TECH B.V.

However, as the accuracy of the factor also depends on viscosity, pressure and temperature, special

attention should be taken for gases in the gas/liquid state where specific heat, density, and viscosity can vary

tremendously. Apply to factory for more detailed information.

For gas mixtures a good approach is the following simplified equation:

mix

= + +.....

mix

= Conversion factor for gasmixture

= Conversion factor for gas n

= Volumetric part of gas n in the mixture

Example: Gasmixture contains:

(1) 10%

C1 = 1.00

(2) 30% Ar C2 = 1.40

(3) 50%

C3 = 0.76

(4) 10% He C4 = 1.41

0.10

1.000

0.30

1.40

0.50

0.76

0.10

1.41

1.043

mix

+ +

+ =

mix

= 0.959

When the original meter has been calibrated on 500

/ min

, 100% means:

500

⋅ =

0.959

1.00

480

/ min

mixture.

When the original meter has been calibrated on 500

/ min

Argon, then 100% means:

500

⋅ =

0.959

1.40

343

/ min

gas mixture

1.5.1 Software for conversion factor calculation

Bronkhorst High-Tech B.V. gathered the physical properties of over 600 fluids in a database called

FLUIDAT



Application software, such as FLUIDAT



on the Net (FOTN), enable the user to calculate accurate

conversion factors, not only at 20°C/1 atm (as shown in the conversion table, App.1) but at any

temperature/pressure combination.

Apply to your distributor for more details of this software.

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