VEGA VEGASWING 51 - contactless electronic switch - Manual (Page 8)

3 .2 Principle of operation
VEGASWING 51 is a point level sensor with tuning fork for level
detection.
It is designed for industrial use in all areas of process technology and
can be used in liquids.
Typical applications are overfill and dry run protection. With a tuning
fork of only 40 mm length, VEGASWING 51 can be also mounted e.g.
in pipelines from DN 32. The small tuning fork allows use in vessels,
tanks and pipes. Thanks to its simple and robust measuring system,
VEGASWING
51 is virtually unaffected by the chemical and physical
properties of the liquid.
It functions even under difficult conditions such as turbulence, air
bubbles, foam generation, buildup, strong external vibration or
changing products.
Fault monitoring
The electronics module of VEGASWING 51 continuously monitors via
frequency evaluation the following criteria:
l Strong corrosion or damage on the tuning fork
l Loss of vibration
l Line break to the piezo drive
If a malfunction is detected or in case of power failure, the electronics
takes on a defined switching condition, i.e. the contactless electronic
switch opens (safe condition).
The tuning fork is piezoelectrically energised and vibrates at its
mechanical resonance frequency of approx. 1200 Hz. The piezos are
fixed mechanically and are hence not subject to temperature shock
limitations. The frequency changes when the tuning fork is covered by
the medium. This change is detected by the integrated electronics
module and converted into a switching command.
VEGASWING 51 is a compact instrument, i.e. it can be operated
without external evaluation system. The integrated electronics
evaluates the level signal and outputs a switching signal. With this
switching signal, a connected device can be operated directly (e.g. a
warning system, a PLC, a pump etc.).
The data for power supply are specified in chapter "Technical data".
3 .3 Operation
The switching status of VEGASWING 51 can be checked with closed
housing (signal lamp). Products with a density > 0.7 g/cm³ (0.025 lbs/
in³) can be detected.
Application area
Functional principle
Voltage supply
8 VEGASWING 51 • - contactless electronic switch
3 Product description
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