VEGAFLEX:
Level measurement with guided microwaves
In this type of radar level measurement, microwave pulses are conducted along a cable or rod probe and reflected by the product surface. The measuring probe ensures that the signal reaches the medium undisturbed. Liquids, solids and separation layers (interfaces) in liquids are commonly measured with this measuring technique.
The advantages
The sensors measure reliably even with:
- Steam generation
- Pressure and temperature fluctuations
- Dust and noise
- Condensation
Applications in liquids
Density fluctuations, steam generation or strong pressure and temperature fluctuations do not influence the measuring result. Also buildup on the probe or the vessel wall do not influence the measurement. An ideal application is level measurement in a bypass tube where even products with dielectric values below 1.6 can be measured reliably. Also connection tubes – bypass tubes have no influence.
Applications in bulk solids
Typical problems in bulk solids such as e.g. dust and noise generation or condensation do not influence the reliability. Also the shape of the material cone or the product properties, e.g. the change from dry to wet sand do not influence the measuring result. Since the instruments are already preadjusted, setup is limited to connection of the sensor.
Interface measurement in liquids
The measuring principle was developed for detection of the interface. Typical applications are measurements of oil and solvents on water. The microwave impulse is reflected a second time on an interface with different dielectric value. This allows the detection of a second level. The advantage against displacers or floats is that the measuring principle is independent of density and does not use any moving parts. Through the digital communication interfaces or connection of a VEGAMET 625, the output of both levels is possible.
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