Radar level instruments have been widely used in the cement and bulk solids industries for many years, with great success. Measuring the level in silos used to hold bulk solids (figure 1) can pose challenges Monitor technologies is a leading provider for a wide range of solutions in continuous level measurement and remote inventory management systems for the storage of powders & bulk solids in bins, silos, vessels, etc.
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Guided wave radar sensors use time domain reflectometry to measure level
Silo radar level measurement uses a pulse generator and a grain bin fill sensor to determine the level of solids present in the silo
The pulse is transmitted down a contact cable or rod, then returns when it encounters the change in dielectric marked by the shift from air to the grain.