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Example 1 ‘V’ Notch   Weir 
 
 
 
In  this  example,  it  is  required  to  calculate  the  flow  through  a  Simple 
Exponential Device, which on this occasion is a V-Notch Weir. Ratiometric 
calculation will be used, there is no requirement for alarms and the flow rate 
is to be displayed in litres/second. The totaliser is to record the flow in cubic 
metres but is not to be displayed during RUN. 
The distance from the end of the transducer horn (dB Mach 3) to zero flow 
(P105)  is  1  metre  and  max  head  (P704)  is  0.4  metres,  maximum 
flow(P705) is known to be 96.5 litres/second.