VEGA VEGASON 71 - D - Manual (Page 30)

VEGASON 71 - D 30
7.6.5 V-Notch
With sharp weir edge
K (Factor)
Calculation of the actual flow value (Q)
The following formula can be used for calculation of the
actual flow.
Q = K • h 2,5
α
in
°
Q in m 3 /h
h in m
Assumed values for a calculation example
α
= 45
°
K = 2056 (derived from
α
)
h = 0,33 m
Calculation example
Q =
2056 • 0,33 2,5 = 128,6 m 3 /h
Programming acc. to calculation example
Q
max
= 128,6 m 3 /h
- Mode 0 - 82 , flow = 0129
- Mode 0 - 83 , multiplier = 0
- Mode 0 - 84 , time unit = 3
Explanation:
Q
max
= max. flow in m 3 /h
α = angle of beam
K = weir specific factor
h
max
= max. weir height in mm or m
k = thickness of the weir in mm
7 Output results
h
max
2 - 3 x h
max
3 - 4 x h
max
Selection of the actual flow (Q)
Flow schedule for usual V-Notch
α K Q
max
h
max
Q
min
h
min
in
°
(Factor) in m 3 /h in mm in m 3 /h in mm
90 4966 1385,0 600 4,4 60
60 2869 800,0 600 2,5 60
45 2056 573,3 600 1,8 60
30 1334 372,0 600 1,2 60
22,5 989 275,8 600 0,87 60
If a V-Notch acc. to above value is used, the value for Q
max
can be taken out of the respective column and can be
used for programming of mode
0 - 82 … 0 - 84 .
Programming acc. to selection Q
max
= 573,3 m 3 /h
- Mode 0 - 82 , flow = 0573
- Mode 0 - 83 , multiplier = 0
- Mode 0 - 84 , time unit = 3
k
≈
3 mm
45
°
k ≈ 3 mm
≥ 2 x h
max
α
or