Fluke-biomedical VT305 User Manual Page 65

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Gas Flow Analyzer
Operation Principle of Flow Measurement
51
Operation Principle of Flow Measurement
A differential pressure measurement is used to find the flow in the flow channel. To make the pressure difference, a linear flow element is used as a flow
resistance. See Figure 44.
Pressure Difference ∆p
Linear flow element
Gas Flow Q
gyo046.eps
Figure 44. Linear Flow Element
η: dynamic viscosity of the gas (Pa s)
p: Gas density (kg/m
3
)
c1, c2: device-specific constants (channel geometry)
Dynamic viscosity
The viscosity of a medium, is its resistance to flow and tear off of the flow.
The viscosity is strongly contingent on the temperature.
The viscosity of the medium is slightly dependent on pressure and humidity of the medium.
Density
Density is the unit of mass per unit volume of the medium.
Density is strongly contingent on the pressure and temperature.
The influence of environmental conditions is the reason why the flow is occasionally transformed to standard conditions.
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