Pulsar Measurement Ultra 3, Instruction Manual

Page: 77 / 179

PULSAR MEASUREMENT
77
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).
3 x Hmax
minimum
FLOW (q)
DRWG. 1
DRWG. 2
DRWG. 3
FLOW (q)
FLOW (q)