SICK WL160-F440 Photoelectric Sensor

Mounting Brackets: SICK dedicated metal fixing brackets

Cables: M8 4-pin straight / angled extension cables (YF2A series)

6. Alternative Model Reference within the Same Series
7. WL160-P440: Single PNP output only, identical 6.5 m sensing range (old variant, phasing out)
8. WL160-E440: Single NPN output only
9. Upgrade Replacement: GL6-F4211 (new generation with identical dimensions, same sensing distance and compatible wiring)
10. Typical Application Scenarios

SICK WL160-F440 Polarized Retro-reflective Photoelectric Sensor  (Order No.: 6022774)

1. Model Code Breakdown

2. Core Electrical & Optical Specifications

2.1 Sensing Performance

Sensing Principle: Retro-reflective with polarization filter (suppresses false triggering caused by metallic and mirror-like surface reflections)

Light Source: Visible red LED, wavelength 680 nm

Sensing Distance: 0.01 ~ 6.5 m (with PL80A reflector); stable standard range: 0.01 ~ 4.5 m

Response Time: ≤ 0.5 ms, suitable for high-frequency counting and high-speed production lines

Switching Mode: Toggle between Light-on / Dark-on via the built-in adjustment knob

2.2 Electrical Ratings

Supply Voltage: 10 ~ 30 V DC, ripple tolerance ±10%

Quiescent Current Consumption: ≤ 25 mA (no load)

Output Type: Push-Pull, max. load current 100 mA, with short-circuit and reverse polarity protection

Connection: M8 4-pin straight male connector

Output Compatibility: Universal for NPN/PNP PLC inputs

2.3 Mechanical & Protection Specifications

Dimensions (W × H × D): 11 mm × 38 mm × 23 mm

Housing Material: PBT engineering plastic; Lens: PMMA

Ingress Protection: IP67 / IP69K (high-pressure wash resistant, applicable for food and cleaning production lines)

Operating & Storage Temperature: Operating: -25 ℃ ~ +55 ℃; Storage: -40 ℃ ~ +70 ℃

MTTFD (Mean Time To Dangerous Failure): 1,574 years; frequent replacement is unnecessary under normal working conditions

3. M8 4-Pin Pin Assignment (Standard Pinout)
4. Pin 1: Brown → +24 V DC
5. Pin 2: Black → Switch signal output (Push-Pull)
6. Pin 3: Blue → 0 V DC / GND
7. Pin 4: White → Function reserved (unused for this model)
8. Key Advantages
9. Polarized Optics: Eliminates false triggers from metal workpieces, glossy packaging and mirror-surface conveyor belts;
10. Type-F Push-Pull Output: Directly drives NPN/PNP PLCs without external pull-up resistors;
11. Wide operating temperature range + IP69K washdown resistance, ideal for food, logistics, packaging and oily machine tool environments;
12. Miniature housing fits confined installation spaces; dual LED indicators (power status + contamination warning);
13. Dust and moisture resistant, equipped with green contamination warning LED to alert lens fouling faults in advance.
14. Mandatory Matching Accessories

Standard Reflectors: PL80A (matched for full 6.5 m range), SP250 short-distance reflective sheet

Object counting and presence detection on packaging conveyor lines

Food & beverage filling lines, cleaning stations (IP69K washdown compatible)

Metal workpiece in-position detection for machine tools (polarization anti-reflection)

Logistics sorting, blockage detection for belt conveyed materials

Position limit detection for automated small doors and lifting equipment

Full Brand Recommendation for Retro-reflective Photoelectric Sensors

Classified into four tiers: High-End European & American Brands, High-Precision Japanese Brands, Cost-Effective Korean Brands, Domestic Alternative Brands. Each tier includes core strengths, representative series and applicable scenarios, with benchmark comparison against the SICK WL160 you are using.

Tier 1: High-End European & Industrial-Grade American Brands (High Stability, Preferred for Harsh Working Conditions)

1. SICK (Germany, your currently used brand)

Main Retro-reflective Series: WL160, WL12, WL24, WL27

Core Advantages: Mature polarization filter technology, IP69K washdown rating, wide temperature range (-25 ~ +55 ℃), universal Type-F push-pull output, built-in lens contamination warning; full coverage of long sensing distances from 6.5 m to 30 m, complete range of IO-Link intelligent models

Applicable Scenarios: Food cleaning lines, metal workpiece detection for machine tools, logistics sorting, anti-reflection detection for automotive production lines

2. Leuze (Germany, Specialist for Transparent Object Detection)

Main Polarized Retro-reflective Series: PRK25, PRK3B, PRK46B

Core Advantages: Coaxial polarized retro-reflective optics, specially designed for transparent bottles, films and glass; self-collimated optical path with large installation tolerance and strong resistance to intense ambient light interference

Applicable Scenarios: Transparent material packaging, pharmaceutical filling, photovoltaic glass inspection

3. Banner (USA, Specialized in Photoelectric Sensors)

Main Retro-reflective Models: QS18, Q20, M12 cylindrical polarized variants

Core Advantages: Circuitry resistant to strong ambient light and inverter interference, dual product lines including economical models and high-precision laser retro-reflective sensors, compact size for easy installation

Applicable Scenarios: 3C electronics, small conveyor lines, light-duty outdoor equipment

4. Pepperl+Fuchs (Germany)

Main Retro-reflective Series: RL28, RL31, RLK cylindrical / square polarized photoelectric sensors

Core Advantages: Complete portfolio of explosion-proof, heavy-duty and semiconductor cleanroom-specific models, stable long-distance detection, top-tier EMC anti-interference performance

Applicable Scenarios: Explosion-proof chemical stations, lithium battery production, heavy industry conveyor lines

5. IFM Electronic (Germany)

Main Miniature Polarized Retro-reflective Series: O6, O7

Core Advantages: Standardized IO-Link interface, integrated metal housing, oil and vibration resistant, fully compatible industrial bus ecosystem

Applicable Scenarios: Automated machine tools, intelligent operation & maintenance for conveying lines

Tier 2: High-Precision Japanese Brands (High Consistency & Precision)

1. Keyence (Premium Japanese Brand)

Main Retro-reflective Series: LR-X laser retro-reflective series, PR-M polarized photoelectric series

Core Advantages: Digital teach-in function, unaffected by workpiece color or surface reflection, stable detection of tiny objects, ultra-fast response speed; laser versions feature ultra-small light spots for precise positioning

Applicable Scenarios: High-precision assembly, electronic SMT mounting, ultra-thin material inspection, high-end production lines with sufficient budget

2. Omron (Universal All-Rounder)

Main Retro-reflective Series: E3Z-R61/E3Z-R81 (classic 15 m retro-reflective), E3FS, E3ZM polarized series

Core Advantages: Largest global installed base, interchangeable accessories and brackets, dual PNP/NPN outputs, simple commissioning, balanced cost performance, numerous domestic replica alternatives

Applicable Scenarios: General packaging, conveyor counting, small automated equipment, standard factory machine configuration

3. Panasonic

Main Polarized Retro-reflective Series: CX-481, CX-442

Core Advantages: Ultra-thin form factor, low power consumption, wide temperature tolerance, widely used for small equipment and manipulator limit positioning

Applicable Scenarios: Injection molding manipulators, small conveying equipment, light-duty warehouse detection

Tier 3: Cost-Effective Korean Brands (Affordable Imported Alternative to Omron)

Autonics

Main Polarized Retro-reflective Series: BJ series (BJ3M-PDT, BJ10M)

Core Advantages: 30% lower price than Japanese brands, parameters matching Omron E3Z, polarization anti-reflection design, complete M8/M12 connector options, abundant domestic stock availability

Applicable Scenarios: Medium & small packaging, logistics, woodworking machinery, mass production cost reduction as import replacement

Tier 4: Domestic Alternative Brands (Low-Cost, Fully Compatible with Import Wiring Pinouts)

1. Lanbao (Top-Tier Domestic Brand, Benchmarks SICK / Omron)

Main Polarized Retro-reflective Series: LRD, PRD

Advantages: IP67/IP69K washdown resistant, push-pull output, identical dimensions to WL160 / E3Z for direct mechanical replacement, stability close to imported products, comprehensive after-sales service

2. Sodron (Manufactured with Omron Homologous Processes)

Main Series: SR retro-reflective photoelectric sensors, fully compatible with E3Z in pin assignment and dimensions

Advantages: Former OEM supplier for Japanese brands, strong anti-interference performance, preferred replacement solution for mass equipment production

3. F&C JIAZHUN, KJT

Positioning: General economical grade, full coverage of 3 ~ 10 m retro-reflective range, complete polarized variants, ultra-low unit price

Applicable Scenarios: General conveying, woodworking, non-standard packaging equipment, mass procurement with tight budget

4. Huaming Sensor, Aoyili (Domestic Specialists for Transparent Object Detection)

Feature: Coaxial polarized retro-reflective optics dedicated to transparent films and glass bottles, benchmarking Leuze PRK series at only 1/3 of the import price

5. Quick Matching Guide for Model Selection
6. Heavy washdown environments, metallic reflective surfaces, long-distance detection: SICK, Leuze
7. Transparent bottle / film detection: Leuze, Huaming Sensor, Keyence laser retro-reflective sensors
8. High-precision tiny workpieces, high-end production lines: Keyence
9. Standard general machinery, standardized component selection: Omron, Autonics
10. Cost reduction domestic replacement, direct swap for WL160 / E3Z: Lanbao, Sodron
11. Explosion-proof, heavy industry, semiconductor cleanroom environments: Pepperl+Fuchs, IFM Electronic

Complete Application Scenarios for Retro-reflective Photoelectric Sensors

Working Principle: The transmitter emits red light or laser beam, which bounces back to the receiver via a matched reflector. A signal is triggered once an object blocks the light path. Standard polarized variants eliminate false detection from metallic and glossy surfaces. With long sensing distance, simple installation and minimal wiring, retro-reflective sensors are the most widely used photoelectric type in automation.

1. Packaging & Printing Industry (Most Common Application Field)
2. Conveyor Line Material Presence Detection

Counting, material sorting and equipment halt alarms triggered as cartons, packaging bags, plastic boxes and gift boxes pass through the sensing zone.

2. Transparent Material Detection (Special Polarized Models)

Ordinary through-beam sensors tend to generate false detections for mineral water bottles, glass bottles, PET films and transparent blister packs; polarized retro-reflective sensors deliver stable identification.

3. Sealing & Carton-Closing In-Place Detection

Detection of sealing roller position, heat-seal film presence and cap crimping status for carton sealers.

4. Sheet Separation & Bottle Counting

Batch counting for beverage filling lines, pharmaceutical blister packs and packaging bags; alarms for missing bottles or materials.

5. Paper Shortage & Paper Jam Protection for Printing Machines

Detect paper roll availability and paper breakage during feeding; automatically stop equipment to prevent roller damage.

2. Food & Beverage Processing (IP67 / IP69K Washdown Models Mainly Used, e.g. SICK WL160)
3. Filling Production Lines

Empty bottle in-position detection, full bottle identification, defective missing bottle rejection; position signal transmission for sauce barrels and cans on conveyors.

2. Cleaning & Sterilization Stations

Spray washing and cooking equipment with IP69K high-pressure wash resistance for oily and humid environments; polarization eliminates false reflection from stainless steel tanks.

3. Sorting & Conveying

Diversion and reversing for snack packaging bags, meat pallets and cartons via matching air cylinders for lane separation.

4. Warehouse Palletizing

Carton in-position detection, pallet presence verification, positioning limit for robotic material pick-up.

3. Logistics Warehousing & Express Sorting
4. Conveyor Belt Material Detection

Detect blockage of cartons, parcels and express packages to control belt start/stop and speed regulation.

2. Cross Sorters & Wheel Sorters

Trigger barcode scanning and sorting diversion when parcels arrive; filter empty flow channels without packages.

3. Automated Warehouse / Stacker Crane Limit Detection

Upper/lower travel limit for lifting platforms, fork entry/exit in-position detection, shelf occupancy monitoring.

4. Tote & Plastic Pallet Identification

Reject empty pallets and release loaded pallets to prevent stacker crane collisions.

4. Machine Tools, Metal Processing & Automotive Manufacturing (Polarized Retro-reflective Mandatory)
5. Metal Workpiece In-Position Detection

Positioning of steel/aluminum sheets in stamping, CNC lathe and milling machine processes; polarization filters eliminate false triggering from specular metal reflections.

2. Automated Silo Material Feeding

Detection of bar and plate stock presence; halt equipment and alert operators for material replenishment when stock runs low.

3. Tooling Fixture Limit Detection

Confirmation of robotic workpiece gripping and fixture full closure signals.

4. Automotive Welding & Coating Lines

Detection of car body shell and frame conveyance position; dustproof and waterproof variants for coating workshops with long-distance car body detection capability.

5. Auxiliary Safety Detection for Punch & Bending Machines

Alarms for material jamming and scrap accumulation.

5. 3C Electronics & Automated Assembly Equipment
6. PCB & Plastic Housing Conveyance Presence Detection

Detection of circuit board production lines and ejection of injection-molded phone housings.

2. Small Material Limit Positioning

Left/right and upper/lower origin limit for robotic slides, replacing mechanical limit switches with contactless, wear-free operation.

3. Packaging Housing Missing Part Detection

Detect presence of battery casings and connectors; automatically reject defective units with missing components.

4. Miniature Retro-reflective Sensors for Cleanrooms (Mini Square WL160 / O6 Series)

Installable inside compact equipment without false triggering caused by dust.

6. Woodworking, Rubber & Plastic, Building Material Machinery
7. Wood Panel Conveyance Detection

Detect board presence on wood cutting and edge banding machines; halt equipment upon material breakage.

2. Plastic Extrusion Production Lines

Count output of PVC/PE plastic pipes and aluminum extrusions, trigger alarms for pipe jamming.

3. Ceramic Tile & Stone Conveyor Lines

Detect tile conveyance position and missing tiles; high-protection variants for ceramic dust environments.

7. General Automation for Door Control, Lifting & Logistics Hoisting Equipment
8. Automatic Doors, High-Speed Roller Shutters, Industrial Sectional Doors

Position limit for door bodies, obstacle detection in door passage to prevent pinching personnel; long-distance retro-reflective sensors suitable for large industrial doors.

2. Lifting Platforms, Loading Dock Levelers

Upper/lower travel limit for platforms, truck arrival detection.

3. Forklift Anti-Collision & Zone Protection

Light curtain protection for factory aisles, alarm triggered upon unauthorized vehicle entry.

8. Lithium Battery, New Energy, Chemical & Light Industry
9. Lithium Battery Electrode & Cell Conveyance Detection

Detect cell pallet presence and trigger alarms for broken roll stock; inverter EMI resistant models are adopted.

2. Chemical Packaging Lines

Detection of paint bucket and fertilizer bag presence; Pepperl+Fuchs explosion-proof retro-reflective sensors selected for hazardous explosion-prone areas.

9. General Applications for Small Non-Standard Automation Equipment
10. Equipment Origin & Travel Limit

Replaces mechanical limit switches for longer service life with zero mechanical impact wear.

2. Material Blockage & Overflow Alarm

Detect clogging at silo discharge ports and stop equipment timely to prevent jamming.

3. Conveyor Diversion & Rejection Control

Activate air cylinders to push out defective products once the light path is blocked by faulty items.

Summary of Application Advantages: Retro-reflective vs Through-Beam / Diffuse-Reflective Sensors

1. Wiring only required on one side; reflectors need no wiring, cutting installation and cabling costs;
2. Long stable sensing distance (3 ~ 30 m), while diffuse-reflective sensors lose stability at long ranges;
3. Polarized variants support detection of metallic, glossy and transparent objects; diffuse-reflective sensors suffer frequent false triggers from reflective surfaces;
4. Ideal for long conveyor belts, large industrial doors, automated warehouses and long-distance detection on heavy machine tools.

Unsuitable Scenarios for Retro-reflective Sensors

1. Ultra-thin tiny workpiece detection (light path cannot be fully blocked; diffuse-reflective or laser sensors are preferred);
2. Workpieces that permanently cover the reflector surface (repeated faults due to dust and oil coating the reflector);
3. Applications requiring identification of tiny protrusions without full light path blockage by the workpiece (switch to diffuse-reflective sensors).