VEGA VEGASON 54P…56P Profibus PA - Manual (Page 4)

4 VEGASON 54P … 56P
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 54 … 56 sensors are a newly
developed generation of extremely compact
ultrasonic sensor for level measurement.
They were developed for liquids and
especially for solids and larger measuring
distances. They are the right choice for
applications in silos, bunkers and material
dumps.
Due to small housing dimensions and proc-
ess fittings, the compact sensors are an
unobtrusive, and most of all, very cost-
effective solution for your level measurement
applications. With the integrated display and
a special sensor intelligence in conjunction
with large measuring ranges, they enable
high-precision level measurement and can
be used for applications in which the advan-
tages of non-contact measurement could
never before be realised.
The outputs generate a digital Profibus PA
signal as output, i.e. measurement signal.
Measuring principle
High-performance piezoceramic transducers
emit focused ultrasonic pulses which are
reflected by the product surface. The meas-
urement electronics prepares a precise im-
age of the environment from 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.
distance
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 a precise, calibrated level value.
Since the speed of sound is subject to tem-
perature influence, the transducer also con-
tinuously detects the ambient tempera-
ture, so that the level is precisely measured
even in case of varying ambient temperature.