VEGA VEGASON 54K…56K - Manual (Page 28)

28 VEGASON 54K … 56K
≥
250 mm
Shaft pump
Measuring tube
Shaft pump
see also „4.5 Socket
extension“
Socket piece
min.
distance
Meas. range
Example of a socket extension or measuring tube in a
shaft
4.4 Measurement of solids
Flange mounting
As with applications for liquids, the instrument
can be mounted on a short DIN socket con-
nection on vessels for solids. However the
socket must be short enough to allow the
transducer end to protrude from it and to not
get in the way of the ultrasonic signals. The
swivelling holder enables not only the align-
ment to the product surface but also the
minimisation of false echoes.
In the course of filling and emptying, the
product surface often takes on different
shapes. This can change the quality of the
useful echo. The alignment of the transducer
should thus ensure that false echoes are
always at a minimum, even when the con-
tainer is empty. You can have a look at the
echoes on the PC with adjustment program
VVO (see chapter "6 Setup/Adjustment with
the PC/Sensor optimisation/Echo curve“).
Mounting and installation
Pump shaft
Narrow shafts and shaft openings (vessel
openings) with very rough walls and shoul-
ders make an ultrasonic measurement ex-
tremely difficult due to strong false echoes.
This problem can be overcome by using an
extended socket piece or a complete meas-
uring tube (see chapter "4.5 Socket exten-
sion“).
VEGASON 54C with an adapter flange on a DN 200
vessel flange
Reference plane
Min. distance
Shaft
Very good measuring results can be attained
with a measuring tube in continuous narrow
shafts, see figure. The applied measuring
tube must have smooth walls inside (e.g. PE
sewage pipe) and a diameter
≥ 200
mm. This
arrangement works well as long as the inside
of the measuring tube collects no dirt or
buildup (cleaning necessary). You might
want to instead consider using hydrostatic
pressure transmitters or capacitive measur-
ing probes. The measuring tube must either
be never immersed, or always immersed in
the medium (measurement carried out exclu-
sively within the tube).