VEGA VEGAPULS 61 (≥ 2.0.0 - ≤ 3.8) 4 … 20 mA__HART four-wire - Manual (Page 21)

100%
0%
1
> 500 mm
Fig. 16: VEGAPULS 61 in a bypass tube. The polarisation marking on the
process fitting must be in one plane with the tube holes or the tube connection
openings.
1 Marking of the polarisation direction
W hen the sensor is mounted on a bypass tube, the distance from
VEGAPULS 61 to the upper tube connection should be approx.
500 mm (19.69 in) or more. In case of extremely rough tube inner
walls, you should use an inserted tube (tube in tube) or a radar sensor
with tube antenna.
T he short examples are meant to give only introductory information on
the flow measurement. Planning information is available from flume
manufacturers and in special literature.
Meas. wall with rectangular flume
I n general, the following points must be observed:
l I nstall the sensor on the headwater side
l I nstallation in the centre of the flume and vertical to the liquid
surface
l D istance to the overfall orifice
l D istance of orifice opening above ground
l M in. distance of the orifice opening to bottom water
l M in. distance of the sensor to max. storage level
Flow measurement
VEGAPULS 61 • 4 … 20 mA/HART four-wire 21
4 M ounting
28439
-EN
-100426