LVL-B Series vibration limit switches sense levels of bulk solids. They have no mechanical moving parts. The switches are FM- and CSA-certified as dust ignition proof (DIP) for Class II and Class III, Divisions 1 and 2, Groups E-G. They feature a 250 mm (10 in.) vibrating rod, and are available with 500 mm (20 in.), 1,000 mm (40 in.) and 1,500 mm (60 in.) extension pipes.