VEGA VEGAPULS 45 Profibus PA - Manual (Page 4)

4 VEGAPULS 42, 44 and 45 – Profibus PA
24908-EN-041227
1 ns
278 ns
Pulse sequence
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.
1 Product description
VEGAPULS series 40 sensors are a newly
developed generation of extremely compact,
small radar sensors for accurate, high-reso-
lution measurement. They are characterised
by very good focusing properties for appli-
cations in narrow spaces. With very modest
space requirements, they were developed
for measuring distances of 0 … 4 m/10 m/
20 m and are the right choice for standard
applications such as storage vessels, reser-
voirs and buffer tanks as well as process
tanks.
Due to small housing dimensions and proc-
ess fittings, the compact sensors are an
unobstrusive, and most of all, very cost-
effective solution for your level measurement
applications. With the integrated display, they
enable high precision level measurements
and can be used for applications in which the
advantages of non-contact measurement
could never before be realised due to high
costs.
VEGAPULS 40 radar sensors are perfectly
suited to two-wire technology. The supply
voltage and the output signal are transmitted
via one two-wire cable. The instruments pro-
duce a digital Profibus output signal as out-
put, i.e. measuring signal.
1.1 Function
Ra dio d etecting a nd r anging: Radar.
VEGAPULS radar sensors are used for non-
contact and continuous distance measure-
ment. The measured distance corresponds
to a filling height and is outputted as level.
Product description
Measuring principle:
emission – reflection – reception
Extremely small 26 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 im-
pulses from emission to reception is
proportional to the distance and hence to the
level.
emission - reflection - reception
Meas.
distance