The Leuze HT3C/4P (Global Part Number: 50129376) diffuse reflection sensor with background suppression is a premier miniature optoelectronic device from the acclaimed Series 3C engineered by Leuze (Germany) – a world-leading manufacturer of smart sensor systems and optical automation safety. Designed specifically to master demanding industrial environments within constrained mounting envelopes, this sensor provides unmatched optical precision, powerful background rejection, and outstanding installation versatility.

At the heart of the Leuze HT3C/4P is an optimized focused beam geometry with a fixed 200 mm focal distance and a 633 nm pulsed visible red LED light source. Operating on advanced background suppression (BGS) triangulation, the sensor restricts optical black-white contrast error to less than 10% across distances up to 220 mm. This guarantees reliable, bounce-free detection of diverse workpieces, dark matte plastics, and coarse or reflective textures without false triggering caused by moving machinery or reflective conveyors directly behind the target plane. It delivers a guaranteed operating range from 5 mm to 450 mm, with precise scanning range calibration achieved via an integrated multiturn potentiometer (15 to 450 mm adjustable span).

Engineered for high-speed automated environments, the HT3C/4P delivers a high 1,000 Hz switching frequency with an ultra-responsive 0.5 ms response time (166 µs response jitter), making it an ideal choice for high-throughput packaging, labeling, robotic pick-and-place, and sorting machinery. The miniature housing is molded from high-grade PC-ABS plastic with a scratch-resistant PMMA lens cover, achieving IP67 and IP69K ingress protection alongside stringent ECOLAB chemical resistance certification across an ambient temperature range of -40°C to +60°C. Equipped with dual PNP transistor switching outputs (Light switching on Output 1 / Dark switching on Output 2), integrated short-circuit and reverse polarity protection, and an integrated 2-meter 4-wire PUR cable, the sensor ensures dependable, long-term performance.

• Brand: Leuze (Germany)
• Product Series: Series 3C
• Part Number: HT3C/4P (50129376)
• Operating Principle: Diffuse reflection principle with background suppression (BGS)
• Beam Path: Focused beam path
• Focal Distance: 200 mm
• Light Source: Visible Red LED, pulsed transmission
• Wavelength: 633 nm
• LED Risk Group: Exempt group (acc. to EN 62471)
• Light Spot Geometry: Square
• Operating Range (White 90%): 0.005 ... 0.45 m (5 ... 450 mm)
• Operating Range (Gray 18%): 0.01 ... 0.34 m (10 ... 340 mm)
• Operating Range (Black 6%): 0.015 ... 0.22 m (15 ... 220 mm)
• Operating Range Limit: 0.005 ... 0.45 m
• Adjustment Range: 15 ... 450 mm
• Black-White Error: < 10% (up to 220 mm scanning distance)
• Operating Supply Voltage (UB): 10 ... 30 V DC (incl. residual ripple 0 ... 15%)
• Open-Circuit Current: 0 ... 15 mA
• Number of Digital Outputs: 2 outputs
• Switching Element: PNP Transistors
• Switching Principles: Output 1: Light switching, Output 2: Dark switching
• Maximum Output Load Current: 100 mA
• Switching Frequency: 1,000 Hz
• Response Time: 0.5 ms
• Response Jitter: 166 µs
• Readiness Delay: 300 ms
• Protective Circuits: Short-circuit protection & Polarity reversal protection
• Sensitivity Adjustment: Multiturn rotary potentiometer
• Display Indicators: 2 status LEDs
• Electrical Connection: Integrated cable, 2,000 mm (2m) length
• Cable Sheathing Material: PUR (Black color)
• Conductor Count / Cross Section: 4-wire x 0.2 mm²
• Housing Construction: Miniature Cubic design
• Housing Dimensions (W x H x L): 11.4 mm x 34.2 mm x 18.3 mm
• Housing Material: Plastic (PC-ABS, Industrial Red)
• Lens Cover Material: Plastic (PMMA)
• Net Weight: 50 g
• Mounting Method: Through-hole mounting (Recommended M3 screw torque: 0.9 N·m)
• Degree of Protection: IP67, IP69K
• Material Compatibility: ECOLAB certified
• Protection Class: Class III
• Standards & Certifications: cULus, IEC 60947-5-2
• Ambient Operating Temperature: -40 °C to +60 °C
• Storage Temperature: -40 °C to +70 °C