INTRODUCTION
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Manual USZ 08 · EN05 · 2015-06
10
Survey of equations used
Equations for the ERZ 2000 USC / USE 09-C
Path velocity
v
i
= Flow
velocity,
(m/s)
measured in path i
t
i1
= Transit time in direction 1 (path i)
(s)
t
i2
= Transit time in direction 2 (path i)
(s)
L =
Path
length
(cm)
d =
Axial
distance
(cm)
2
i
1
i
i
2
i
t
t
t
d
2
L
v
2
i
1
i
i
t
t
t
Corrected path velocity
v
ci
= Corrected path velocity
(m/s)
k
i
= Correction factor for path i
i
i
ci
v
k
v
Weighted flow velocity
v
w
= Weighted flow velocity
(m/s)
w
i
= Weighting factor regarding the flow profile
6
1
i
ci
i
w
v
w
v
Corrected weighted flow velocity
v
wc
= Corrected weighted flow
(m/s)
velocity
K
V
=
Meter
factor
K
R
= Correction factor, Reynolds number
F
= Error from error curve linearization
Re =
Reynolds
number
A, B, C = Parameters for Reynolds number correction function
100
F
V
R
w
wc
1
K
K
v
v
C
R
Re
log
B
A
K
Flow rate at measurement conditions
Q
m
= Flow rate at measurement conditions
v
w
= Weighted flow velocity
D
i
= Inside
pipe
diameter
h
s
3600
4
D
v
Q
2
i
w
m
Corrected flow rate at measurement conditions
Q
mc
= Corrected flow rate at measurement conditions
v
wc
= Corrected weighted flow velocity
D
i
= Inside
pipe
diameter
k
c
= Correction factor, error curve linearization
h
s
3600
4
D
v
k
Q
2
i
wc
c
mc
