LEUZE FRK 92/3-300 L Ex EX-PROTECTED PHOTOELECTRIC SENSOR (PART NUMBER: 50080724)

DEEP PRODUCT OVERVIEW & HAZARDOUS ALIGNMENT
The Leuze FRK 92/3-300 L Ex (Order Part Number: 50080724) is a premium-tier industrial diffuse reflection photoelectric sensor equipped with specialized Background Suppression (BGS) optics, belonging to the specialized 92 Ex Series developed by the global automation expert Leuze electronic (Germany). This device represents a highly engineered tracking solution compliant with the most stringent international explosion protection directives (ATEX). It is fully approved for secure installation and long-term deployment inside hazardous environments classified as Zone 1 (for atmospheres plagued by ignitable gases or vapors) and Zone 21 (for plants with heavy concentrations of volatile industrial fine dust). The FRK 92/3-300 L Ex stands as the benchmark selection for chemical processing structures, paint kitchens, fuel warehouses, and grain-milling plants, where a standard optical sensor's micro-electric spark could trigger a catastrophic plant failure.

INTRINSICALLY SAFE NAMUR EN 60947-5-6 INTERFACE
The underlying technical architecture ensuring the absolute explosion-proof reliability of the FRK 92/3-300 L Ex is its specialized NAMUR compliance (EN 60947-5-6). This sensor intentionally completely omits standard high-current switching PNP or NPN transistor output stages. Instead, it operates on a precise internal impedance variation principle that dynamically modulates current consumption within a low-voltage spectrum of 5.5V to 13V DC. During field operation, the device must be wired into an external intrinsically safe Isolator Barrier or a NAMUR Switching Amplifier mounted safely outside the hazardous location. This intrinsically safe methodology restricts electrical power levels sent to the sensor to a micro-fraction of standard scales, ensuring that even in severe events like broken cables or dead shorts on the shop floor, the device is physically incapable of generating electric arcs, sparks, or thermal surface points that could ignite the surrounding hazardous atmosphere.

SMART BACKGROUND SUPPRESSION & RANGE CALIBRATION PER MATERIAL PROFILE
The sensor implements an energetic diffuse reflection loop paired with a pulsed red LED light source, regulated by geometric triangulation background suppression (BGS) electronics:
- Unlike standard diffuse tracking units that are prone to false triggers caused by varying background reflections, the optical receiver grid of the FRK 92/3-300 L Ex computes the incoming angle of the bounced light rays to lock down target distance. Only objects situated within the specified operational boundary zone (up to 300 mm) are validated.
- Any background items positioned behind the preset limit (such as bright factory bulkheads, high-gloss machinery guards, or wet conveyor tracks) are systematically isolated and suppressed by the internal lens. This makes it perfect for precise short-range tracking: standard white profiles (90% remission) secure a stable distance from 30 to 300 mm, neutral gray targets (18% remission) operate from 40 to 250 mm, and light-absorbing matte black targets (6% remission) function smoothly from 40 to 220 mm with minimum color-based range deviation.

HEAVY-DUTY DIE-CAST ZINC HARDWARE & ENVIRONMENTAL SHIELDING
- Toughened Die-Cast Zinc Enclosure: Moving away from baseline plastic shells, the FRK 92/3-300 L Ex features an industrial black die-cast zinc metallic barrel designed to absorb significant physical shocks, withstand structural compression, and resist degradation under chemical vapors or aggressive solvent washdowns. The front optical lens window is crafted from thick reinforced glass, ensuring exceptional scratch resistance and maintaining long-term beam transmittance. Weighing a solid 140 g and fitted with a ruggedized metal M12 4-pin quick disconnect plug, the hardware eliminates loose joint risks or fluid ingress.
- Severe IP67 Ingress Rating: Guarantees complete sealing against fine particulates and full defense against heavy water spray during routine line cleaning. Operating with a controlled switching frequency of 60 Hz tailored for safe ignition prevention across an ambient spectrum of -20°C to +50°C, the device limits its maximum surface thermal threshold below 80°C, making it an uncompromised automated monitoring component for explosive processing sectors.

OPTICAL DATA & TRACKING PERFORMANCE
- Operating Principle: Diffuse Reflection with Background Suppression (BGS)
- Light Source: Red LED (Visible beam in pulsed light pattern)
- Optical Light Spot Shape: Circular spot profile
- Reliable Operating Sensing Ranges (Operating range):
  + White Target (90% remission): 30 mm to 300 mm
  + Grey Target (18% remission): 40 mm to 250 mm
  + Black Target (6% remission): 40 mm to 220 mm
- Maximum Sensing Range Limit: 300 mm

ELECTRICAL SPECIFICATIONS & SIGNAL INTERFACE
- Supply Operating Voltage: 5.5 ... 13 VDC
- Digital Output / System Communication Type: NAMUR Standard Protocol (EN 60947-5-6 compliant)
- Signal Logic Current Profile: Current-controlled impedance modulation (Requires external intrinsically safe isolating switch amplifier / barrier)
- System Switching Frequency: 60 Hz (Optimized loop frequency strictly configured for spark prevention and intrinsic protection)

CONNECTION INTERFACE & PLUG DETAILS
- Electrical Connection Type: Standard M12 Quick Disconnect Plug (Male Connector)
- Number of Contact Pins: 4-pin arrangement
- Mechanical Coupling Type: Heavy-duty integrated Metal threaded sleeve for vibration absorption

MECHANICAL PROPERTIES & MATERIAL COMPOSITION
- Physical Enclosure Dimensions (W × H × L): 20 mm × 80 mm × 42.2 mm
- Net Device Weight: 140 g
- Enclosure Substrate Material: Heavy-duty Die-cast Zinc alloy barrel (Coated in industrial black)
- Optical Lens Window Material: High-shattering-resistance optical Glass
- Mechanical Fixing Method: Secure through-hole structural bolt assembly passing through the sensor casing

ENVIRONMENTAL RATING & EXPLOSION PROTECTION (ATEX / Ex)
- Ingress Protection Rating: IP67 (Completely dust-tight and temporary water immersion proof)
- Electrical Safety Classification: Class II insulation insulation
- Ambient Operating Temperature Spectrum: -20°C to +50°C
- Ambient Storage Temperature Spectrum: -40°C to +70°C
- Equipment Explosion Classification (Ex Device Category): Category 2 approved
- Atmospheric Group Rating (Ex Group): Group II (For surface industrial facilities; completely barred from underground mining zones)
- Hazardous Classification Zone Mapping (Ex Zone): 
  + Ignitable Gas / Vapors: Approved for Zone 1 and Zone 2 deployments (Gas present under normal operational loads)
  + Conductive / Non-Conductive Dust: Approved for Zone 21 and Zone 22 deployments (Combustible dust grids present regularly)
- Maximum Allowed Structural Surface Temperature: 80°C (Ensures a cold outer surface to prevent auto-ignition)
- Compliance Certifications: cULus certified, fully aligned with international IEC 60947-5-2 guidelines for industrial sensing equipment.