VEGAVIB and VEGAWAVE are point level sensors based on the vibration principle. VEGAVIB is equipped with a vibrating rod as sensor element,
VEGAWAVE has a tuning fork.
Both are designed for industrial use in all areas of process technology and are deployed mainly in bulk solids.
The vibrating element (vibrating rod or tuning fork) is energized piezoelectrically and vibrates at its mechanical resonance frequency. The piezos are mechanically fixed and hence not subject to temperature shock limitations. When the vibrating element is immersed in the product, the vibration frequency changes. This change is detected by the integrated electronics module and converted into a switching command.
Typical applications are overfill and dry run protection systems. Due to the rugged vibration measuring system, the vibrating level switches remain virtually unaffected by chemical and physical properties of the bulk solid.
They also work when subjected to strong external vibrations or changing products.
Function monitoring
The electronics module continuously monitors the following criteria:
•Correct vibrating frequency
•Line break to the piezo drive
If one of the stated malfunctions is detected or in case of voltage supply,
the electronics takes on a defined switching status, i.e. the relay deener
gises (safe state).
Solid detection in water
With instruments in the version for solid detection in water (option), the vibrating element is adjusted to the density of water. If submerged in water (density 1 g/cm³), the level switch signals "uncovered". Only if the vibrating element is also covered with solids (e.g. sand, sludge, etc.) will the sensor signal "covered".
