Food & Drink Processing & Packaging Issue 41 2022 | Page 6

Precise , reliable detection of marks and colour contrast

Contrast and luminescence Sensors are usually the ‘ go to ’ device for reliable detection of print marks and colour variances even at very low contrasts and are typically used for applications such as printing , labelling and packaging .
Sensing and instrumentation specialists BAUMER have developed one of the widest ranges of innovative sensing products and are now acknowledged as being one of the leading ‘ one-stopshops ’ for most process to packaging applications . A good example of this is their new range of OC50 / OC60 Contrast and Luminescence Sensors which provide reliable and precise detection of minute and invisible print marks even at very fast speeds thanks to low jitter > 7 µ s . ‘ Jitter ’ is best described as any deviation in , or displacement of the signal pulses in a high-frequency digital signal and the amount of ‘ allowable jitter ’ is highly dependent on the sensing application . 6 FDPP - www . fdpp . co . uk
Developed on the intensity discrimination principle the OC50 is a basic contrast sensor with the ability to detect even the smallest differences between a mark and the background with a Jitter of > 25 µ s . It features RGB LED and single-lens optics , PMMA lenses all contained in a compact and robust plastic housing . It also has static teach-in with LED display and is available with optical lenses for distances up to 18mm .
The OC60 is offered for higher performance contrast sensing for lower Jitter measurements of > 7 µ s using the same RGB LED single lens optics as the OC50 although with glass lenses , static and dynamic teach-in within a metal housing . Optical lenses for this option are available for distance up to 40mm . The OC60 also has an adjustable cable outlet in 5 positions along with industry standard front and side mounting options . These features , along with a sensing beam that can leave the unit either vertically or horizontally ensures maximum positioning flexibility .
The OC60 luminescence sensing option features UV LED single lens optics , glass lenses and is designed for effective detection of fluorescent markings and can be adjusted for 5 sensitivity levels . It provides very quick response times of 0.34 ms and is available with optical lenses for distances up to 50mm .
The OC60D has a colour mode to detect not only the contrast but also the actual colour so is particularly suitable for colour detecting and sorting applications , such as those required for packaging in the food and drink processing industries .
More here : https : / www . baumer . com / gb / en / product-overview / object-detection / photoelectric-sensors / contrast-andluminescence-sensors / c / 42493
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