Instructions for Use – SCHMIDT
®
Flow Sensor SS 20.600 Page 14
Calculation of volume flow
A quasi-parabolic speed profile is formed over the pipe’s cross-section
under laminar conditions. Whereas the flow velocity at the pipe walls re-
mains almost zero, in the middle of the pipe it reaches the optimum meas-
uring point, its maximum w
N
.
This measured variable can be converted into an average flow velocity
that is constant over the pipe cross-section with the aid of a correction
factor the so-called profile factor.
The profile factor PF depends on the inner pipe diameter
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