Sensors & Transducers


New infrared sensor for online thickness gauges

October 2018 Sensors & Transducers

Yokogawa has announced the WG51S2 infrared sensor for the Webfrex NV online thickness gauge to measure and control the thickness of films and sheets with greater accuracy than before.

Thickness gauges are used on film and sheet production lines to measure and control film and sheet thickness. Various kinds of plastic film have been developed for packaging, including highly functional film that can preserve the quality of packaged contents and film that can be printed with vivid colours to improve the attractiveness.

With its unique optical system consisting of a frequency-modulated light source and dual-integrating spheres, and its digital lock-in amplifier circuit for weak-signal detection, the WG51S2 offers significantly improved accuracy and measurement stability. It is suitable for use with thin films (10 to 300 μm). With 20 μm thick polypropylene film, the sensor achieves its maximum accuracy of 0,1 μm. It can be used for a variety of applications including transparent, opaque, and foamed films. As the WG51S2 has been optimised for reliable on-line measurement, it is much less affected by film pass-line fluctuation or disturbance infrared light, and precise measurement is assured even with fast moving film.

Conventional sensors are equipped with a motor for rotating the filter and the motor needs to be replaced periodically. The WG51S2 uses a frequency-modulated light source with no consumable mechanical parts. The light source is the only part that needs to be replaced, and it is designed for easy replacement requiring no adjustment. With already installed Webfrex NV systems, upgrades to the new WG51S2 sensor can be done without having to change the frame that houses the sensor.

For more information contact Christie Cronje, Yokogawa South Africa, +27 11 831 6300, christie.cronje@za.yokogawa.com, www.yokogawa.com/za


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