A modular steel tape rotary encoder is available for shafts with diameters from 6 in. (150 mm) to 6 ft (~2 m). Applications for the MSR 40, an economical ring encoder, include rotary tables and turbine shafts. The steel tape of the MSR 40 uses the Single-Field Scanning principle with 200µm grating pitch – offering ease of mounting and high angular resolution. System accuracy is ±30 µm/m with an operating temperature of 0 to +50° C. The encoder can work at high speeds, especially for large measurement applications. A clever feature of the MSR 40 encoder is that it links the ends of a steel tape together with one of two joining mechanisms. This makes it possible to measure through a full 360°. Another version (MOR) uses a steel-ring-tensioning cleat for encoders mounted to a steel surface thus allowing for thermal expansion. The MER version uses a rubber gasket with a low-profile tensioning cleat for other mounting surfaces. Depending on shaft diameter, line counts of up to 20,000 are available on the MSR 40. All versions offer quasiabsolute positioning by distance-coded reference marks or homing by a single reference mark. The MSR 40 mounts easily and comes in standard and custom sizes.
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