The vibrating blade detector VEGASWING 60 became the standard for the anti-overflow applications on liquids. This solution offers maximum guarantees of safety because independent and not influenced by the same physical sizes as measurements of level. Concerned with safety units (valve, pump, warning signal, alarms,...) are directly connected downstream on a circuit separately which can be controlled regularly by simple support on a key test located on the off-set electronics of the detector. The threshold does not require any adjustment, it completely transparent because is given by the length of the sensor and the assembly. The principle is without wear and maintenance. Aggressive products are detected with reliability with materials with high chemical behavior like the hastelloy or enamel. These detectors offer a very broad applicatif spectrum because insensitive with the variations of dielectric, viscosity, pressure, temperature and foams. They in addition have a continuous self-monitoring which announces any defect instantaneously (rupture of line, failure of the blades, corrosion, short-circuit, etc.). Approvals ATEX II G for explosive zones are available and of the versions answering the classes of safety SIL 2 and SIL 3 according to standard IEC 61508 are deliverable.