Pulsar FlowCERT LITE - BS3680 Thin Plate Weirs

Page 41
Exponent Type
Formula
Exponent
K Factor
V-Notch Weir
Q=Kh
x
Where:
Q =Flow
K=K factor
h=head
x
=exponent
2.50
Automatically
selected by
FlowCERT
LITE
Automatically
calculated,
dependent on
measurement,
flow and time
units chosen.
Other
Q=Kh
x
Enter value as
required
Enter value as
required
Contracted
Rectangular
Weir (With End
Contractions)
Q=K(L-0.2*h)h
x
Where:
Q =Flow
K=K factor
L=crest length of weir
h=head
x
=exponent
1.50
Automatically
selected by
FlowCERT
LITE
Automatically
calculated,
dependent on
measurement,
flow and time
units chosen.
RATIOMETRIC
If the flow calculation is to be ratiometric P702 = 2 the flow will be
calculated using the formula: q = q
cal
(h/h
cal
)
X
Where: q = flowrate
q
cal
= flowrate at maximum head (705)
h = head
h
cal
= maximum head (P704)
x = exponent (determined as in absolute calculation above)