Optical Speed meter Family

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Non-contact speed measurement instruments in rugged housings designed specifically for the harsh environments found in steel and aluminium rolling mills. Two models cover a wide range of applications ranging from the high speed measurement of small diameter hot wire rod to the slow creep speeds of cold and hot slabs.

The SM3100 model uses two identical IR sensors which are spaced apart by a precisely known amount, and are aimed at two small portions of the rod, bar or strip. Using advanced cross-correlation techniques, the speed of the hot product is computed by measuring the time delay between the output of the two IR sensors, that is, the time needed for a point on the product surface to travel between the two viewing positions. Thanks to the wide vertical viewing angle of the sensors, the measurement is not affected by vertical movements and vibrations of the product, which is usually the case with small products. A built-in alignment laser provides a quick and simple way to ensure that the sensor is aimed correctly.

  • Dual wide angle IR Sensors
  • Digital and analog output
  • Compact size
  • No physical contact with rolled product
  • Wide tolerance to material position changes
  • Continuous measurement of small dimension hot product
  • Easy to install and aim
  • Increased plant yield
  • Improved cut-to-length results
  • Improved rolling speed measurement


The SM3200 model employs machine vision techniques to accurately track the movement of low-speed products. By comparing consecutive images of the product surface, its movement, and thus its speed, can be computed by relying on sophisticated and adaptive algorithms. Thanks to a built-in powerful solid-state light source, both hot and cold products can be measured irrespective of their reflectivity or temperature. These features allow the SM3200 to precisely measure forward, reverse and zero speed of both hot and cold slow moving products, favourably comparing to more expensive optical instrumentation.

  • Matrix sensor allows both horizontal and vertical speed components to be sensed
  • Built-in Profibus and quadrature encoder output
  • No physical contact with rolled product
  • Not affected by surface scale or temperature
  • Sturdy and easy to maintain
  • Highly accurate casting speed measurement
  • Excellent slab positioning applications
  • Fourier analysis of measured speed allows to check mould oscillation effectiveness

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