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Page
57
R
ATIOMETRIC
V-Notch Angle Weir
(Non BS 3680)
If the flow calculation is to be
ratiometric P702 = 2
the flow will be
calculated using the formula: q= q
cal
(h+kh/h
cal
+kh)
2.5
Where: q = flowrate
q
cal
=
flowrate at maximum head P705
h = head
kh = compensated head
Universal Calculations
Point of Measurement
The transducer must be above the
maximum head P704
by at least the near
blanking distance P107
.
For all
Universal
calculation applications the point at which the head is
measured should be chosen such that the surface of the liquid is not affected
by turbulence.
Calculations
A
BSOLUTE
Universal Head Vs Flow
If the flow calculation is to be
absolute
P702
=
1
the flow will be calculated
using the formula: q = q(h)
Where: q
= flowrate
q(h) = flowrate for head
The desired number of
Breakpoints
,
(
P730 - P793
) are to be entered in
pairs in values of
head
and corresponding
flow
. (Minimum of 2 pairs of
Breakpoints is required).
Содержание FlowCERT LITE
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