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, maintenance-free level sensing of bulk solids materials. They are FM- and CSA-certified as Dust Ignition Proof (DIP) for Class II and Class III, Divisions 1 and 2 and Groups E-G, and are suitable for use in hazardous area applications.