LVL-B Series vibration limit switches are insensitive to material build-up, external vibration and flow noise, and have no mechanical moving parts for reliable level sensing of bulk solids. They're FM- and CSA-certified as dust ignition-proof (DIP) for Class II and Class III, Divisions 1 and 2, and Groups E-G. They come with a 250-mm (10-in.) vibrating rod and a choice of extension pipes.