In the processing of web material for automotive parts no the strip tension sensors may be used that contain silicone or paint wetting disruptive substances (called laps). HAEHNE sensors meet these requirements upon request. On the other hand, the sensors that are used in the strip tension, for example in pickling plants used must be protected so that they are here used by alkalis and acids for pickling, degreasing, passivation and burnishing not be attacked, generally with protection class IP65. HAEHNE offers due to its long-term experience waterproof solutions for almost any industrial-type environment, e.g. also for the textile and paper industries.