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.
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