Functional description
page 27
rev. 00 / 04.09.2017
13.2 Flow Calculation
In case of using single-path or multi-path installations in one level under the condition
Q = ʋ
average
• A
• given
ʋ
average
= average flow velocity
A = cross-sectional flow area
It is required to involve a velocity coefficient “k” to compensate the difference between the
measured velocity ʋ
g
and the average velocity ʋ
average
within the cross-sectional area.
Then the flow rate can be calculated by using the signal transit time as follows:
−
⋅
Φ
⋅
⋅
⋅
=
⋅
⋅
=
−
−
−
−
2
1
1
2
2
1
2
1
1
1
cos
2
t
t
L
A
k
A
k
Q
g
υ