VEGA VEGASCAN 850 - Manual (Page 4)

4 VEGASCAN 850
Product description
1 Product description
1.1 Function
Continuous level measurement with ultrasonic
sensors is based on the running time meas-
urement of ultrasonic pulses.
VEGASON series 51 … 56 sensors are a
newly developed generation of extremely
compact ultrasonic sensors for level meas-
urement. They were especially developed for
liquids (51 ... 53) and for solids and larger
measuring ranges (54 ... 56).
Due to the small housing dimensions and
process fittings, the compact sensors are a
very reasonable solution for your level meas-
urement applications. With the integrated
display and a special sensor intelligence, in
conjunction with large measuring ranges,
they can be used for applications in which
the advantages of non-contact measurement
could never before be realized.
As output and measuring signal, the sensors
produce a digital output signal which is proc-
essed and evaluated in VEGASCAN 850.
VEGASCAN 850 then outputs the processed
measured values as a digital communication
protocol.
Measuring principle
Piezoceramic high-performance transducers
emit focused ultrasonic pulses which are
reflected by the product surface. The meas-
urement electronics prepares a precise im-
age of the environment out of the reflected
ultrasonic pulses. The transducers work both
as transmitter and receiver. As receiver, the
transducers are high-sensitivity piezo micro-
phones.
emission - reflection - reception
Meas. dis-
tance
The measurement electronics precisely cal-
culates the distance between transducer and
medium from the speed of sound and the
measured running time of the emitted sound
impulse. The distance is then converted into
a level-proportional signal, and in conjunction
with the sensor parameter settings, made
available as precise, calibrated level value.
Since the speed of sound is subject to tem-
perature influence, the transducer also con-
tinuously detects the ambient temperature,
so that the level is precisely measured even
in case of varying ambient temperature.