PULSAR MEASUREMENT
93
Ratiometric
If the flow calculation is to be ratiometric P702 = 2 the flow will be
calculated using the formula: q= q
cal
C
e
/C
ecal
(h
e
/h
ecal
)
1.5
Where:
q = flowrate
q
cal
= flowrate at maximum head P705
Ce = discharge coefficient calculated by Ultra 3 P723
Ce
cal
= discharge coefficient at maximum head
he = effective head
he
cal
= effective head at maximum head
Special Devices
Point of Measurement
The transducer must be above the maximum head P704 by at least the
near blanking distance P107.
In the case of a Palmer Bowlus flume the point of head measurement
should be half the value of Dim “A” P710 upstream of the device.
For a H-Flume the head measurement is taken at a point downstream from
the flume entrance as detailed in the table below:
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