Contrast sensors

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The contrast makes the difference

This sensor type can use various light sources – such as white light, laser-generated red light or RGB light – to very precisely detect and compare contrasts and report the results to the process with minimal signal jitter. Through the automatic selection of the right transmitter colors, various color or gray value combinations can be reliably detected.

KRT 3B

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The smallest of their type, also with IO-Link

The contrast sensors of the KRT 3B series distinguish between grayscale values, enabling them to detect minimal contrasts. As a result, a check can be performed for the presence of text or imprints or so-called marks detected.

  • Scanning range 14.5 mm/ 60 mm (laser)
  • Multicolor (RGB), white or laser light
  • Various teach-in processes,
  • Switching-threshold correction via EasyTune
  • Min. response time 50 µs
  • Switching frequency up to 10 kHz
  • Pulse stretching
  • IO-Link interface

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KRT 18B

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Permanent signal indicators via bar graph

In many packaging processes, contrast marks must be reliably detected on film, bag and blister packaging or on labels. The KRT 18B contrast sensor combines ease-of-use via permanent signal indicators with high performance. It is also available with an analog output for particularly demanding mark detection.

  • Multicolor (RGB)
  • Models with teach buttons and potentiometers
  • Self-adjusting bar graph for signal display
  • Recipe management via IO-Link
  • Automatic sensitivity readjustment
  • Nickel-plated metal housing
  • Switching frequency up to 15/22kHz
  • Degree of protection IP67 and IP69K with ECOLAB
  • Scanning range 13 (+/-3) mm
  • Response time 20/30 µs
  • Adjustment without tool

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KRT 55

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In WASH-DOWN design

Wherever food, beverages, pharmaceutical products or even cosmetics are manufactured, processed and packaged, hygienic design has become a central requirement. These contrast sensors in WASH-DOWN design can withstand even more intensive cleaning and disinfection cycles. The IO-Link interface facilitates simple adaptation to complex applications.

  • Stainless steel housing AISI 316L
  • Scanning range 13 mm
  • RGB or white light
  • Various teach-in processes
  • Switching-threshold correction via EasyTune
  • Response time 50 µs
  • Switching frequency 10 kHz
  • Pulse stretching
  • IO-Link interface

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KRT 20

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Ultrafast and high-resolving cut-marking systems

With jitter times <7 µs, with precise, round and small light spots, with memory bank administration and freely programmable interface, with perfect temperature compensation, these devices in a robust metal housing can handle even the fastest processes.

  • Metal housing with interchangeable lenses
  • Scanning ranges of 12/20 mm and 50 mm
  • Very high resolution
  • Response time 10 ms
  • Switching frequency 50 kHz
  • Switching and analog output
  • Temperature compensation
  • Pulse stretching
  • Switching-threshold changeover
  • Freely programmable
  • Rectangular or round light-spot profile

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KRT 21

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Standard housing andshort response time

With a response time of 33 µs, RGB transmitter, interchangeable lenses and other fundamental equipment details, any contrast marks are reliably detected. The simple adjustment to mark and background makes for uncomplicated commissioning.

  • 9 mm or 18 mm scanning range
  • Interchangeable lenses made of glass and plastic
  • Multicolor (RGB) transmitter
  • Static teach-in
  • Response time 33 µs
  • Switching frequency 15 kHz
  • Pulse stretching

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Contact & support

Tel.: 07021 / 573-308
Mo - Th: 8:00 am to 5:00 pm
Fr: 8:00 am to 4:30 pm
Tel.: 07021 / 573-306
Mo - Th: 8:00 am to 5:00 pm
Fr: 8:00 am to 4:30 pm
Tel.: 07021 / 573-307
Mo - Th: 8:00 am to 5:00 pm
Fr: 8:00 am to 4:30 pm