Electronic Vibration Switch for Alarm and Shutdown Protection of Fans, Pumps, Motors and Critical Machinery


The new Series 685B electronic vibration switch from the IMI Division of PCB Piezotronics offers two set points with individual alert and alarm levels. Many previous product options are now standard features with this new compact design. In addition to having two solid state or form C relays, each Series 685B electronic vibration switch includes a raw vibration output signal for spectrum analysis, 4-20 mA output signal for overall vibration trending, and unique 4-20 mA calibration feature, allowing for precise threshold setup. It has dual openings for easy wiring and installation. Series 685B switches are available as AC or DC powered units. Variable time delays prevent false relay trips due to 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.


• Frequency Range(±3 dB)-120 to 60,000 cpm (2 to 1000 Hz) • Threshold Set Point(alarm)-10 to 100% FS measurement range • Alarm Time Delay(adjustable, both alarms)1 to 45 seconds • Start Up Delay(fixed, both alarms)20 seconds • Analog Vibration Output Signal100 mV/g • Operating Temperature Range-22 to +158 °F (-30 to +70 °C) • Storage Temperature Range-40 to +257 °F (-40 to +125 °C) • Current Draw<150 mA • Housing MaterialAluminum alloy • Mounting Holes(4 places)0.21 (5.4 mm) inch diameter • Size(w × h × d) 3.5 × 2.8 × 3.5 inch (90 × 70 × 90 m • Weight1.85 lb (839 gm) • Power-on LEDgreen • Alarm 1 LEDyellow • Alarm 2 LEDred
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