Onicon F-2600 Manual do Utilizador descarregar pdf (Página 126)

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F-2600 & F-2700 Vortex Flow Meter Manual 02/15 - 0808-7 / 19204 Page B-5

Calculations for Liquid

Use this formula to determine the settings for “Goyal-Dorais” selections and “Other

Liquid” selections entered in the Fluid Menu. The liquid calculations were taken

from Richard W. Miller, Flow Measurement Engineering Handbook (Third Edition,

1996).

Density

The liquid density is found using the Goyal-Doraiswamy Equation. Goyal-

Doraiswamy uses the critical compressibility, critical pressure and critical

temperature, along with the molecular weight to nd the density. The equation for

specic gravity is:

Mw 0.008

-0.01102

0.773

The specic gravity can then be converted into density.

Viscosity

The liquid viscosity is found by Andrade’s equation. This uses two viscosities at

different temperatures to extrapolate the viscosity.

Andrade’s equation:

μ = A

exp

degR

To nd A and B

degR1

degR2

ln (

/ 

)

degR



exp (B

degR1

The temperatures are all in degrees Rankin. Do not believe the subscript R means

they are reduced temperatures.

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Onicon F-2600 Manual do Utilizador Página 126