Installation of the sensor at the inlet side, Distance to the venturi flume, Min. distance of the sensor to max. storage level – VEGA VEGAPULS 61 (≥ 2.0.0 - ≤ 3.8) 4 … 20 mA__HART four-wire User Manual
Page 22
h
m
ax
d
m
in
≥
2
m
m
x
h
m
ax
90°
4
3 ... 4 h
max
≥ 50 mm
90°
2
3
1
Fig. 17: Flow measurement with rectangular flume: d = min. distance of the
sensor; 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
I
n general, the following points must be observed:
l
I
nstallation of the sensor at the inlet side
l
I
nstallation in the centre of the flume and vertical to the liquid
surface
l
D
istance to the Venturi flume
l
M
in. 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
sensor; h
max.
=
max. filling of the flume; B = tightest constriction in the flume
1
Position sensor
2
Venturi flume
22
VEGAPULS
61 • 4 … 20
mA/HART four-wire
4 M
ounting
28439
-EN
-100426