The SICK KT8L-N3656 (Part No. 1041263) is a high-performance contrast sensor designed for pinpoint accuracy in detecting small marks or variations in surface contrast—even amidst challenging industrial conditions. It comes with a precision-focused laser emitter, rugged build, and flexible configuration options, tailored for advanced automation applications.

Central to its operation is a Class II red laser light source (wavelength 655 nm) that produces an ultra-fine Ø 0.3 mm round light spot, exiting from the long side of the zinc die-cast housing. This makes it exceptionally capable of identifying very small print marks or subtle contrast changes, critical in quality control, printing, labeling, or fine object detection.

The sensor delivers an adjustable operating range up to 800 mm, with a typical nominal sensing distance of 150 mm, providing versatile detection capabilities across short to medium distances. Its detection tolerances span from –120 mm to +650 mm around the nominal point, giving it adaptability to diverse setups.

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With high-speed measurement performance, the KT8L-N3656 offers a switching frequency of 17 kHz, response time of 30 µs, and jitter less than 15 µs. It supports both a digital NPN switching output and a 0.3–20 mA analog output, ensuring seamless integration with binary control systems and analog process equipment alike.

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Designed for intuitive setup, this sensor includes both static two-point teach-in and dynamic min/max teach-in modes via a front-mounted button, along with automatic drift correction that keeps performance consistent over time. A visual bar-graph display indicates the reliability of detection during teach-in, enhancing usability.

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Built tough, the KT8L-N3656 features a zinc die-cast housing with an IP67 rating, providing strong protection against dust and temporary immersion. It operates from 10 to 30 V DC, consumes under 80 mA, and includes robust circuit safeguards—reverse polarity protection, interference suppression, and short-circuit protected output.

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Measuring 30.4 mm × 53 mm × 80 mm, weighing approximately 400 g, and connecting via a 5-pin M12 male connector, the sensor is compact and easy to install in tight or standardized industrial setups.

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In summary, the SICK KT8L-N3656 is a precision laser contrast sensor that brings together micro-spot detection, high-speed operation, custom teach-in flexibility, and industrial durability—making it an excellent choice for automation systems that demand dependable, fine-resolution contrast detection in tough environments.