The Series 685B electronic vibration switch from the IMI Division of PCB Piezotronics offers two set points with individual alert and alarm levels. In addition to having two solid state or form C relays, each switch includes a raw vibration output signal for spectrum analysis, 4-20 mA output signal for overall vibration trending and a unique 4-20 mA calibration feature, allowing for precise threshold setup. It has dual openings for easy wiring and installation. The switches are available as AC or DC powered units. Variable time delays prevent false relay trips due ot machine startup or temporary upset conditions; and the switch can be implemented into a variety of applications because of its ability to respond to acceleration, velocity or displacement.