Bearings have built-in sensors. A combination sensor/bearing unit uses an active sensor principle that functions like an incremental encoder to give accurate measuring down to zero speed. The device consists of a deep groove ball bearing fitted with a single seal and a built-in sensor that features an impulse ring, a sensor body and connecting cables. Together they form a labyrinth seal on the opposing side of the bearing. It provides information about the status of travelling machine parts and enables both open and closed ioop control of these movements. A main feature of the units is their insensitivity to electromagnetic fields -considered essential to trouble-free running in electrically charged environments. Originally developed for anti-locking brakes, sensor/bearings can be used for recording revolutions, speed, direction of rotation, relative position, acceleration and deceleration. Being robustly constructed, they are insensitive to vibration and high temperatures and give uniform output signals. The compact design enables the combination units to take only a little more space than conventional bearings, and the range covers bore diameters from 15 to 45mm. _______________________________________________ For more information contact:- SKF (UK) Luton, Beds. UK October 2001

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