Versatile level switch offers high sensitivity
The "Vibration Smart Switch" is the newest addition to Hawk Measurement's (Middleton, MA) series of point-level switches. Jack Evans, president of Hawk, says the highly sensitive device detects the level of pharmaceutical water, powders, solids, and finished products within a process tank.
A piezoelectric crystal vibrates two tines of the switch's sensing element at their resonant frequency. When material touches the tines, it dampens the signal and activates a relay. The relay can be used to turn a filling cycle off or on.
Evans says the unit can be installed easily at the top or bottom of a process tank or silo. Operators can rotate the switch's head without affecting its conduit connection. An integral version of the switch contains the electronics and probe in one unit. Users can choose to install the unit's display in another location.