Pulsar FlowCERT LITE, Инструкция по эксплуатации

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Page 38
Point of Measurement
The transducer must be above the maximum head P704 by at least the near
blanking distance P107 .
For Suppressed/Contracted Rectangular , Trapezoidal and V-notch ,
weirs, the head is measured upstream at a minimum distance of 3 times
maximum head from the weir plate to ensure the surface of the liquid is not
affected by turbulence or drawdown. (See
DRWG
.
1
)
In the case of a Venturi flume the point of measurement should be 150 mm
upstream from the beginning of the converging section and for a Parshall
flume 2/3 the length of the converging section upstream of the throat
section. See
DRWG 2
and
3
)