Vega VEGASON 61 Operating Instructions Manual page 19

Flow measurement with
Khafagi Venturi flume
VEGASON 61 • Four-wire 4 ... 20 mA/HART
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
•
Distance of the sensor to the max. height of damming by taking
the blocking distance into account
d
90°
1
Fig. 16: Flow measurement with Khafagi-Venturi flume: d = Blocking distance to
sensor; h = max. filling of the flume; B = tightest constriction in the flume
max.
1 Position sensor
2 Venturi flume
In general, the following points must be observed:
•
Installation of the sensor at the inlet side
•
Installation in the centre of the flume and vertical to the liquid
surface
•
Distance to the Venturi flume
•
Distance of the sensor to the max. height of damming by taking
the blocking distance into account
3 ... 4 x h
max
h
max
B
4 Mounting
2
19