The SICK KT8L-P3656 (Part No. 1041262) belongs to the KT8 series of photoelectric contrast sensors, engineered for precise detection of small marks, print contrasts, or objects with slight differences in reflectivity. Built to perform under challenging industrial conditions, it combines ruggedness, precision, and flexibility in configuration.

At its core, the KT8L-P3656 features a Class 2 red laser (655 nm) that emits a finely focused Ø 0.3 mm round light spot from the long side of its zinc die-cast housing. This ultra-fine laser beam enables high-resolution detection of even the smallest targets—particularly useful in applications such as print mark detection, quality inspection, or differentiation between contrasting surfaces.

The sensor offers flexible teach-in capabilities for quick and precise calibration. It includes both static two-point teach-in and dynamic min/max teach-in modes, selectable via a front-mounted button. An integrated automatic drift correction ensures the sensor’s sensitivity remains stable over time and under varying environmental conditions. An intuitive bar-graph display and LED indicators provide visual feedback during setup.

Performance-wise, the KT8L-P3656 delivers high-speed PNP switching with a maximum switching frequency of 17 kHz, a response time of approximately 30 µs, and a jitter of less than 15 µs, making it well-suited for fast-moving processes. Alongside the digital PNP output, it also provides a 0.3–20 mA analog signal, offering flexible integration to either binary logic systems or process controllers that require a linear signal.

Mechanically, the sensor measures approximately 30.4 mm × 53 mm × 80 mm, weighs around 0.4 kg, and connects via a rotatable M12 5-pin male connector, simplifying installation and wiring. It operates reliably across supply voltages from 10 to 30 V DC, with current draw under 80 mA, and features protection against reverse polarity, short-circuits, and electrical interference. The IP67 rating ensures resilience against dust and moisture, while compliance with protection class II supports safe handling.

With an effective sensing distance up to 150 mm (with tolerances allowing from –120 mm to +650 mm depending on contrast), the KT8L-P3656 strikes an excellent balance between precision and reach. Suitable for environments ranging from packaging lines to print inspectors and label applicators, this sensor excels where accurate, high-speed contrast detection is critical.

In summary, the SICK KT8L-P3656 is a compact, laser-based contrast sensor that blends precise detection, configurable teach-in, rapid response, and rugged design. Its combination of features makes it a powerful choice for industrial systems requiring accurate and reliable detection of small or low-contrast marks—even in harsh conditions.