103 Product descriptionVEGAPULS 69 • Foundation Fieldbus47251-EN-160815• Scan the Data Matrix code on the type label of the instrument or• Enter the serial number manually in the appThis operating instructions manual applies to the following instrumentversions:• Hardware version from 1.0.0• Software version from 1.1.0The scope of delivery encompasses:• Radar sensor• Hexagon socket wrench (for instruments with swivel holder)• Documentation– Quick setup guide VEGAPULS 69– Instructions for optional instrument features– Ex-specific "Safety instructions" (with Ex versions)– If necessary, further certificates• DVD "DTM Collection", included therein– PACTware– DTM Collection– Instrument master files (GSD) for Profibus PA– FDT certificatesInformation:In this operating instructions manual, the optional instrument featuresare described. The respective scope of delivery results from the orderspecification.3.2 Principle of operationThe VEGAPULS 69 is a radar sensor for continuous level measure-ment of bulk solids even under the most difficult process conditionsand in very large measuring ranges.It is ideal for use in high, slender silos with poorly reflecting bulk solidssuch as fly-ash, plastic granules or wood chips as well as internalinstallations that cause strong false echoes. This is made possible byits functional principle, a distance measurement through frequencyshifting with an especially small beam angle.The instrument is available with different antenna systems and acces-sories for virtually all applications and processes:• Plastic horn antenna or metal-jacketed lens antenna• Optional or integrated rinsing air connection• Swivelling holder with seal against the processThe instrument emits a continuous radar signal through its antenna.This signal is frequency modulated in the form of a sawtooth wave.The emitted signal is reflected by the medium and received by theantenna as an echo.The frequency of the received signal always deviates from the actualemitting frequency. The frequency difference is proportional to thedistance and thus to the filling height. This difference is calculatedScope of this operatinginstructions manualScope of deliveryApplication areaFunctional principle