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NEW WEB BREAK DETECTION SENSOR

The new non-contact VISIEYE sensor (Fig. 1), developed by Vision Systems Oy of Jyväskylä, Finland and based on CCD-sensor technology with high-speed image processing, replaces many conventional sensors and measurement devices on paper-making and -processing machines. It not only detects web breaks; it also measures edge positions of web, wire or felt. VISIEYE is much more than a monitoring device: it generates control outputs in the event of web breaks as well as control signals when the edge position of a paper web, wire or felt needs to be measured and controlled. Due to the fact that VISIEYE monitors the web position on wire/felt at the same time as it monitors the web itself, the VISIEYE can give reliable real-time information whether or not a break has occurred.

The measurement head is located in a compact stainless steel enclosure (230 x 300 x 117 mm), which also contains a lighting unit comprising long-lasting super-bright LEDs. A special window-cleaning nozzle prevents the ingress of dirt and moisture. The operating temperature range is from +10°C to +125°C when a Vortec air-cooling system is fitted. A maximum of two measuring heads can be connected to a field cabin. Signals from the measurement heads are processed in the field cabin, which may be up to 55 m distant and where a selection of I/O connections provides the interface between VISIEYE and the customer's automation system.

The VISIEYE withstands the aggressive conditions present in paper-making machines. It is mounted, on customized mounting brackets, away from the web. Because the sensor is outside the web area, dirt and condensation water do not drip onto the web and the device is easy to access and to service.

Software and image-processing

The CPU (intelligence unit), which gathers real time information from the field, is installed in the field cabin. When the cabin is connected via an RS232 or fieldbus to a portable computer, the VISIEYE user-interface, a Windows-based parameter-setting pc-software with clear screens and menus, can be used to analyze the data received from production. The software also sets new parameters for the selected measurement head, loads new software, and monitors signal levels during maintenance.

Further information from:

Vision Systems

VISION SYSTEMS Oy
P.O. Box 353
FIN-40101 Jyväskylä,
Finland.
Tel: +358 14 4110100
Fax: +358 14 4110199
www.visionsys.fi