| Measuring principle Magneto-resistive sensors (MR) detect periodic modulation of a magnetic field, transforming the changes to a varying resistance. The field modulation may be generated directly by a rotating magnet or by a combination of a magnet at rest and a rotating ferro-magnetic contour disk or toothed-wheel target. Optimized metallic targets coupled with highly interated electronics are used to manufacture high-resolution incremental and absolute encoders. Properties of the magnetic system: In conditions of high air humidity and varying ambient temperature, the physically defined dew point limit is fast reached. Condensate on the encoder disk often accompanied by an increased occurrence of dirt does not affect magnetic scanning. The magnetic measuring principle is dew-point-proof. The metallic measuring scale and shaft easily copes with combined large temperature variations, strong vibrations and acceleration forces. Magnetic sensors suppliers are almost unaffected by age. The magnetic fields strength of a permanent magnet remains constant over a very long period. The sensitivity of the magnetic sensor is therefore also constant and able to guarantee continuous maintenance-free operation. Even large extraneous electromagnetic fields have no effect on the positional measurements or durability of Lenord + Bauer's magnetic sensors. The positive properties of the magnetic rotary encoders are complementary to one another in almost every respect. Incremental rotary encoders from Lenord + Bauer ensure high operational reliability even under changing ambient conditions and achieve the highest quality standards. |