Vega VEGAPULS 64 Operating Instructions Manual page 26

4 Mounting
Flow measurement with
Khafagi Venturi flume
26
3 ... 4 h
max
90°
2
Fig. 25: Flow measurement with rectangular overfall: d
the sensor (see chapter "Technical data"); h
spillway
1 Overflow orifice (side view)
2 Headwater
3 Tailwater
4 Overfall orifice (view from tailwater)
In general, the following points must be observed:
•
Install the sensor on the headwater side
•
Installation in the centre of the flume and vertical to the liquid
surface
•
Distance to the overfall orifice
•
Distance of orifice opening above ground
•
Min. distance of the orifice opening to tailwater
•
Min. distance of the sensor to max. storage level
Fig. 26: Flow measurement with Khafagi-Venturi flume: h
flume; B = tightest constriction in the flume
1 Position sensor
2 Venturi flume
In general, the following points must be observed:
•
Installation of the sensor at the inlet side
1
3
= max. filling of the rectangular
max.
3 ... 4 x h
max
90°
h
max
1
VEGAPULS 64 • HART and accumulator pack
90°
4
= min. distance of
min.
2
B
= max. filling of the
max.