The Leuze IHRT 46B/4,200-S12 S-Ex n is a high-performance diffuse reflection photoelectric sensor with background suppression from the renowned Series 46B heavy-duty family, engineered by Leuze electronic (Germany). This specialized instrument is constructed specifically for dependable and continuous operation in potentially explosive industrial atmospheres, fulfilling rigorous international explosion-protection certifications for ATEX/IECEx Category 3G (Zone 2 - Flammable Gas/Vapor environments) and Category 3D (Zone 22 - Combustible Dust environments).

Featuring advanced optical background suppression technology (H-RT) paired with a high-power Infrared LED light source, the IHRT 46B/4,200-S12 S-Ex n provides reliable object detection unaffected by target color variations, dark textures, or reflective properties. The intelligent optical design completely ignores distracting background machines or reflective surfaces located just beyond the set operating boundary. The high optical excess gain of the infrared emitter ensures outstanding performance even in dirty, dusty, or oil-mist-laden industrial environments.

Enclosed in a durable, impact-resistant industrial polymer housing with an IP67 ingress protection rating, this sensor withstands harsh mechanical stresses and environmental contaminants. It features a fast-acting transistor PNP output with an easily adjustable scanning range via a precise multiturn potentiometer. With an integrated 200 mm pigtail cable terminated in a standard 4-pin M12 connector (S12), it guarantees vibration-proof electrical connection and simplified maintenance across chemical facilities, automotive paint shops, woodworking plants, grain elevators, and heavy industrial processing lines.

• Manufacturer: Leuze electronic (Germany)
• Series: Series 46B Heavy-Duty
• Model: IHRT 46B/4,200-S12 S-Ex n
• Measurement Principle: Diffuse reflection sensor with background suppression (H-RT)
• Explosion Protection Rating (Ex category): ATEX / IECEx Category 3G (Zone 2) & Category 3D (Zone 22)
• Ex Marking: II 3G Ex nA II T4, II 3D Ex tD A22 IP67 T85°C
• Light Source: Infrared LED
• Optical Wavelength: 880 nm (high-power pulsed)
• Scanning Range (Adjustable): 100 ... 2,000 mm
• Scanning Range Limit (Typical): 100 ... 3,000 mm
• Range Adjustment: Mechanical multiturn potentiometer
• Supply Voltage: 10 ... 30 V DC (incl. residual ripple)
• Digital Switching Output: 1x PNP transistor output
• Switching Function: Light / Dark switching
• Max. Switching Current: 100 mA
• Switching Frequency: 250 Hz
• Response Time: 2 ms
• Readiness Delay: ≤ 300 ms
• Status Indicators: Yellow LED (switching state), Green LED (power & operation reserve)
• Housing Material: Reinforced industrial plastic (PBT / PC)
• Ingress Protection Rating: IP67
• Electrical Connection: 200 mm cable with M12 connector, 4-pin (S12)
• Operating Ambient Temperature: -20 °C ... +50 °C
• Dimensions (W x H x L): 18.5 mm x 76.2 mm x 44 mm
• Net Weight: Approx. 85 g
• Standards & Conformity: CE, c UL US, ATEX EN 60079-0 / EN 60079-15 / EN 60079-31, IEC 60947-5-2