VEGA VEGAPULS 54K enamel - Manual (Page 4)

4 VEGAPULS 54K enamel
24 101-EN-041227
Product description
1 Product description
VEGAPULS series 50 sensors are a newly
developed generation of extremely compact,
small radar sensors.
Due to their small housing dimensions and
process fittings, the compact sensors are an
unobstrusive, and most of all, very cost-
effective solution for your level measurement
applications. With their integrated display
and many of the features of the VEGAPULS
81 series, they bring the advantages of radar
level measurement to applications where
previously, due to high costs, the advan-
tages of non-contact measurement had to be
forgone.
The VEGAPULS 54 radar sensor is perfectly
suitable for two-wire technology, however, it is
also available in four-wire technology where
the output signal and power supply are car-
ried on in two separate circuits. The supply
voltage and the output signal are transmitted
via one two-wire cable. The instruments pro-
duce an analogue 4 … 20 mA output signal
as output, i.e. measuring signal.
In the enamelled version, the sensors have
exceptional chemical resistance, and repre-
sent the ideal level sensor technology for
corrosive processes.
Ra dio d etecting a nd r anging: Radar.
VEGAPULS radar sensors are used for non-
contact, continuous distance measurement.
The measured distance corresponds to a
filling height and is outputted as level.
1.1 Function
Measuring principle:
emission – reflection – reception
Extremely small 5.8 GHz radar signals are
emitted from the antenna of the radar sensor
as short pulses. The radar pulses reflected
by the sensor environment and the product
are received by the antenna as radar ech-
oes. The running period of the radar pulses
from emission to reception is proportional to
the distance and hence to the level.
Meas.
distance
emission - reflection - reception
The radar pulses are emitted by the antenna
system as pulse packets with a pulse dura-
tion of 1 ns and pulse intervals of 278 ns; this
corresponds to a pulse package frequency
of 3.6 MHz. In the pulse intervals, the antenna
system operates as a receiver. Signal run-
ning periods of less than one billionth of a
second must be processed and the echo
image evaluated in a fraction of a second.