The Hall Effect Super-Flat, Non-contacting Rotary Sensor uses the Hall effect Figure 1: Inexpensive, yet powerful - super-flat non-contacting rotary sensor. Easy installation and attractive design. (Photo: Novotechnik) The Hall Effect When a current flows through a Hall component, and a magnetic field is applied perpendicular to both, it yields a voltage that runs transversely in relation to the current. Since this voltage is proportionally related to the intensity of the magnetic field, it allows for the performance of non-contacting angular measurements by way of a positioning magnet installed on a rotating shaft (Figure 2). When several sensor components are combined, and the entire signal processing fits into a few components, the construction of complex sensor systems with tiny footprints becomes a possibility. The Hall Effect-based rotary sensors are largely unencumbered by wear and tear, and not influenced by fluctuating field strengths from the positioning magnets. This technology further impresses through high resolutions and good dynamics, high mechanical mounting tolerances, and the possibility of rapidly devising specialized solutions for customer specific demands. Figure 2: Angular measurement technology utilizing the Hall Effect (Photo: Novotechnik) From a press release issued by: Variohm-Eurosensor Ltd. Tel: +44(0) 1327 351004 Fax: +44(0) 1327 353564 Email: graham@variohm.com Web: www.variohm.com January 2014

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