Description
VEGAWELL S 51
 Suspended pressure transmitter for continuous liquid level measurement
   §Â Dry, ceramic-capacitive CERTEC® measuring cell
§Â Abrasion, shock and overpressure resistant
§Â Integrated overvoltage protection
§Â 4 20 mA two-wire system
§Â Narrow design with only 22 mm diameter
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Function
The dry, ceramic measuring cell CERTEC® is the heart of
VEGAWELL S 51. The hydrostatic pressure of the liquid
column causes a capacitance change in the measuring cell
via the ceramic diaphragm. This change is converted into a
standardised 4 20 mA signal. The complete measuring cell
consists of high purity ceramic and is characterised, apart
from excellent longterm stability, by its very high overload
resistance, e.g. when lowering it from a height as it can strike
the water surface hard and the shock can initiate an offset
error.
Area of application
VEGAWELL S 51 is designed for measurement of liquids in
open vented vessels, tanks, boreholes and sumps, especially
in applications when foam is on the surface. The rugged
measuring cell and special construction means that the
sensor is largely resistant to pressure shocks that can occur
during installation.
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It can be teamed up with VEGAMET 381 which can provide
power, a calibrated output, a display, 2 relay switch points
and fault relay.Â
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Technical data
Ambient temperature                                                    -40 to +60 °C
Product temperature                                                     -20 to +60 °C
Average temperature coefficient of the zero signal         < 0.15 %/10 K
Longterm drift of the zero signal                                    < 0.1 %/2 years
Deviation of characteristics                                           0.2 %
Output signal                                                               4 to 20 mA
Supply voltage                                                             9.6 to 36 V DC
Nominal leakage current (8/20 ?s) Â Â Â Â Â Â Â Â Â Â Â Â Â Â 5 kA
Protection transmitter                                                   IP 68
Material, Transmitter                                                     316L
Diaphragm                                                                   sapphire-ceramic®
Meas. cell seal                                                             FKM
Configuration                                  two wires, breather capillaries, braiding
Wire cross-section                                                        2 x 0.5 mm²
Diameter                                                                      approx. 8 mm
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