21
4 Mounting
VEGAPULS 61 • Profibus PA
28444-EN-141215
h
ma
x
d
mi
n
≥ 2 mm x h
ma
x
90°
4
3 ... 4 h
max
≥ 50 mm
90°
2
3
1
Fig. 17: Flow measurement with rectangular flume: d = min. distance of the sen
-
sor; h
max.
= max. filling of the rectangular flume
1 Overflow orifice (side view)
2 Headwater
3 Tail water
4 Overfall orifice (view from bottom water)
Khafagi-Venturi flume
In general, the following points must be observed:
•
Installation of the sensor at the input side
•
Installation in the centre of the flume and vertical to the liquid
surface
•
Distance to the Venturi flume
•
Min. distance of the sensor to max. storage level
2
3 ... 4 x h
max
90°
h
max
d
1
B
Fig. 18: Flow measurement with Khafagi-Venturi flume: d = Min. distance to sen
-
sor; h
max.
= max. filling of the 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 in a protected area
•
Installation vertical to the liquid surface
Gauge measurement
