Vega VEGASWING 51 Operating Instructions Manual

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3.2 Principle of operationVEGASWING 51 is a point level sensor with tuning fork for leveldetection.It is designed for industrial use in all areas of process technology andcan be used in liquids.Typical applications are overfill and dry run protection. With a tuningfork 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 physicalproperties of the liquid.It functions even under difficult conditions such as turbulence, airbubbles, foam generation, buildup, strong external vibration orchanging products.Fault monitoringThe electronics module of VEGASWING 51 continuously monitors viafrequency evaluation the following criteria:l Strong corrosion or damage on the tuning forkl loss of vibrationl Line break to the piezo driveIf a malfunction is detected or in case of power failure, the electronicstakes on a defined switching condition, i.e. the contactless electronicswitch opens (safe condition).The tuning fork is piezoelectrically energised and vibrates at itsmechanical resonance frequency of approx. 1200 Hz. The piezos arefixed mechanically and are hence not subject to temperature shocklimitations. The frequency changes when the tuning fork is covered bythe medium. This change is detected by the integrated electronicsmodule and converted into a switching command.VEGASWING 51 is a compact instrument, i.e. it can be operatedwithout external evaluation system. The integrated electronicsevaluates the level signal and outputs a switching signal. With thisswitching signal, a connected device can be operated directly (e.g. awarning system, a PLC, a pump etc.).The data for power supply are specified in chapter "Technical data".3.3 OperationThe switching status of VEGASWING 51 can be checked with closedhousing (signal lamp). Products with a density > 0.7 g/cm³ (0.025 lbs/in³) can be detected.Application areaFunctional principlePower supplyVEGASWING 51 • - contactless electronic switch 73 Product description30212-EN-081121