Contrast scanners function energetically according to the principle of photoelectric proximity switches.
At a constant scanning distance, up to 30 gray tones from a scale ranging from black to white can be distinguished. This property is essential for detecting contrast marks, for example printed color bars.

The difference in contrast between the mark and the background is the main factor determining the readability of a mark. The surface of the material can be coarse, smooth or glossy, and can be made of paper, plastic or metal. When glossy materials are to be detected the sensor should, if necessary, be tilted.

KT8

• With CAN-interface for easy parameter administration, process documentation and process adaption
• Automatic drift correction
• Short response time
• 3 emission LED’s: red, green, blue

KT10-2

• 20 µs response time for fast applications
• Small jitter and a precise light spot
• 3-color-LED-technology
• Automatic drift correction
• Detection reliability shown on bar display
• 5 bank memory

KT5-2 Display

• Detection reliability display
• Precise adjustment with +/- buttons
• Gloss adaptation

KT5-2

• 3-color-LED-technology
• Various teach-in’s for individual requirements
• Many different scanning ranges offered
• Gloss adaptation
• Metal housing, IP 67
• KT5L-Laser for detection of small objects
• KTL5 with fibre optic cables

KT3

• Small housing optimal for use in narrow spaces
• 3-color-LED-technology
• Dynamic Teach-in
• Static Teach-in on mark and background
• KT3L-Laser with small light spot and large scanning range

KT2

• Metall housing from W12-2 product family
• Good price/performance ratio
• Red or green light source LED
• Potentiometer for threshold adjustment

KT1M

• Light source white: for a wide range of application
• Easy mounting thanks to accessories
• LED indicator: Switching output active and operation reserve
• Potentiometer 270° for threshold adjustment

NT6

• Proven technology
• Red or green LED, selectable
• Light/dark switching selectable
• Adjustment via potentiometer

NT8

• With incandescent lamp
• Metal housing
• Interchangeable lenses

WTM160T

• Mark sensor
• Cable and plug versions
• Two light emission openings

WLL170T

• Photoelectric switch with fibre-optic cables
• Green LED
• Teach-in