The 109888-0001 is an Inductive Proximity Sensor with NO output. Combined speed sensor and controller stops jammed or overloaded motors and machines before damage occurs. Detects under-speed conditions in conveyor lines, machine tools, ventilating systems or any other rotating shaft where a minimum speed requirement exists. Typically, a "flat", keyway or bolt-head, is detected, precisely timed and compared during each revolution to a set-point adjustment made at "minimum" speed. Any drop in speed immediately produces an output which may be used for emergency stop or other control function. The motion detectors operate as AC or DC switches and are available with high and low-speed ranges.