VEGA VEGAPULS 51K…54K 4 … 20 mA; HART compact sensor - Manual (Page 5)

VEGAPULS 51K … 54K 5
21750-EN-031222
Reflected radar power dependent on the dielectric
constant of the measured product
2
0
0
10
25 %
40 %
5
10
5 %
20
30
40
50
%
4 6 8 12 14 16 18
20
ε
r
Product description
All products which are electrically conductive
reflect radar signals very well. Even slightly
conductive products provide a sufficiently
strong reflection for a reliable measurement.
All products with a dielectric constant
ε
r
greater than 2.0 reflect radar pulses suffi-
ciently (note: air has a dielectric constant
ε
r
of
1). Signal reflectivity grows stronger with
increasing conductivity or increasing dielec-
tric constant of the product. Hence, nearly all
substances can be measured.
Temperature influence: Temperature error absolutely
zero (e.g. at 500°C 0.018 %)
100 500 1000 1300 ˚C 0
0
0,01
0,02
0,03
%
0,018 %
0,023 %
Pressure influence: Error with pressure increase very
low (e.g. at 50 bar 1.44 %)
10
0
0
5
%
1,44 %
2,8 %
10
50
20 30 40 60
100
70 80 90 110 120 130 140
bar
0,29 %
3,89 %
With standard flanges of DN 50 to DN 250,
ANSI 2“ up to ANSI 10“ or G 1½ A and 1½“
NPT, the sensor antenna systems can be
adapted to various products and measuring
environments.
The high-quality materials can also withstand
extreme chemical and physical conditions.
The sensors deliver stable, reproducible
analogue or digital level signals with reliability
and precision and have a long useful life.
Continuous and accurate
Unaffected by temperature, pressure and
atmosphere content, VEGAPULS radar sen-
sors measure quickly, accurately and con-
tinuously the levels of widely varying
products.
VEGAPULS 50 sensors allow radar level
measurement in plants where it was hitherto
unthinkable because of high costs.
1.2 Application features
Applications
• level measurement of any liquid, limited in
solids.
• measurement also in vacuum
• all slightly conductive materials and all
substances with a dielectric constant > 2.0
can be measured
• measuring range 0 … 20 m.
Two-wire technology
• power supply and output signal on one
two-wire cable (Loop powered)
• 4 … 20 mA output signal or HART ® output
signal.
Rugged and abrasionproof
• non-contact
• high-resistance materials
Exact and reliable
• accuracy 1 mm.
• unaffected by noise, vapours, dusts, gas
compositions and inert gas stratification
• unaffected by varying density and tem-
perature of the medium
• measurement in pressures up to 40 bar
and product temperatures up to 200 °C.