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Contrast sensor is compact and robust

Contrast sensor is compact and robust
For contrast sensors used in the likes of the packaging, assembly, handling and printing industries to distinguish colours, labels or printed marks, a colour-neutral vision of the object is essential. The FT 20 WT contrast sensor from Sensopart therefore functions with white light, which enables the detection of many more colour differences in comparison to a single-coloured LED light source. It also has a high resolution of 30 contrast levels. The result is an unusually high sensitivity: the sensor switches quickly and reliably even at the slightest difference in contrast and this over the entire colour spectrum.

The scanning range of the FT 20 WT is 17mm, with a depth of focus tolerance of +/-2mm. The sharp, rectangular light spot of 1.5x4mm2 also enables the detection of small objects. With its maximum pulse frequency of 5kHz, the sensor is also suitable for fast applications: for example, reliable detection of printed marks is guaranteed with a belt speed of up to 900m/min.

Sensopart has succeeded in fitting all these performance characteristics into a very compact (32x20x12mm3), robust plastic casing. The company says that makes the FT 20 WT the smallest contrast sensor on the market, with some competitive products with comparable characteristics being over three times its size.

Another key feature of the FT 20 WT is its ease of use. Instead of time-consuming fiddling with potentiometers, which is often the case in this sensor class, the FT 20 WT offers three user-friendly teach-in modes. Fine adjustment of contrast in particular - virtually impossible with a potentiometer - is no longer a problem. As well as the conventional static teach-in mode, Sensopart also offers dynamic teach-in in which objects can be virtually taught on a 'running conveyor belt', and external teach-in, which is particularly helpful with sensors that are difficult to access.

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