Vibrating level switches are suitable for level detection of liquids or granular, powdered solids. Units with parallel vibrating fork are suitable for liquid, units with non-parallel vibrating fork are suitable for solids. Mounted on pipes, silos, tanks or hopper bins filling / emptying can be controlled using these devices just as well they can generate failsafe alarms providing overfill- or dry run protection.The vibrating rod series of vibrating level switches are robust instruments designed for low and high level indication of Liquids, granules and powders with a minimum of 0.05 kg/dm3 (50 oz/ft3) density. The operation principle is based on that the electronic circuit excites the vibration. When the medium reaches and covers, the vibration stops, when the medium leaves, it returns to vibrate freely. The electronics senses the change of vibration and gives output signal after a selected delay.