SICK WTB8-P2231 Photoelectric Sensor

Straight 4m cable: YF8U14-040VA3XLEAX

Straight 5m cable: YF8U14-050VA3XLEAX

Connector base: STE-0804-G (terminal block for control cabinet wiring)

Installazione completa & Commissioning Manual for SICK WTB8-P2231 Photoelectric Sensor (Order No.6033209)

1. Basic Model Information

Complete Model No.: WTB8-P2231

Ordine ufficiale n.: 6033209

Serie: W8 Ultra-compact Diffuse Sensore fotoelettrico with Background Suppression

Origine: Cina

Accessori standard: Stainless Steel Mounting Bracket BEF-W100-A

Scomposizione del codice modello

1. WT: Diffuse reflective photoelectric sensor
2. B: Equipped with background suppression function
3. 8: W8 miniature housing (11×31×20mm)
4. P: Uscita PNP
5. 22: M8 straight 4-pin connector, red LED light source
6. 31: 4-turn potentiometer adjustment, Light-on / Dark-on switchable
7. Core Optical Specifications

III. Specifiche elettriche

1. Alimentazione elettrica: DC 10～30V, ripple ±10%
2. Produzione: PNP open collector, massimo. load 100mA
3. Quiescent Current: ≤30mA
4. Tempo di risposta: ≤0,5 ms
5. Frequenza di commutazione: 1000Hz (for high-speed object detection)
6. Protezione: Polarità inversa, sovracorrente & short-circuit triple protection
7. Durata di servizio: 100,000 hours for LED light source (25℃)
8. M8 4-Pin Wiring Definition (Straight Connector)

Pin color & funzione (industry standard 4-core cable):

1. BN Brown: CC 24 V+ (L+)
2. WH White: Unused pin (no connection)
3. BU Blue: 0V Negative (M/GND)
4. BK Black: PNP signal output Q
5. Meccanico & Specifiche ambientali

Dimensioni: W11mm × H31mm × D20mm

Peso: Only 10g

Materiale dell'alloggiamento: ABS plastic; optical window: PMMA

Classe di protezione: IP67 (antipolvere, temporary water immersion resistant)

Temperatura operativa: -25℃ ～ +55℃

Temperatura di conservazione: -40℃ ～ +70℃

Montaggio: Fixed via symmetric M3 threaded holes on both sides

1. LED Indicator Description
2. LED verde: Steady on = Normal power supply; Flashing = Unstable detection
3. Orange LED: Illuminated = Sensor output activated (object detected)

VII. Vantaggi fondamentali

1. Powerful Background Suppression: Eliminates interference from metal frames, nastri trasportatori, walls and other backgrounds, ensures stable detection for black & white workpieces
2. Ultra-compact Size: Easy installation in narrow equipment, pipeline modules and robot grippers
3. Risposta ad alta velocità: Ideal for packaging, sorting and small parts counting
4. IP67 dust & water resistance, stable operation in oily & humid workshop conditions
5. 4-turn potentiometer enables high-precision fine-tuning for minor distance adjustments

VIII. Scenari applicativi tipici

Presence detection of materials on packaging production lines

Conteggio & position confirmation of small hardware/plastic components

Leakage prevention detection of products on conveyor belts

Workpiece positioning inside electronic equipment

Sorting small items in logistics systems

1. Alternativa / Distinct Models in the Same Series
2. WTB8L-P2231: Laser version with identical housing, smaller light spot for high-precision long-distance detection
3. WTB8-N2231: NPN output variant (for PLC negative common input)
4. WTB8-P1301: M8 elbow cable outlet, for space-limited installation
5. WTB8-P2231V: Sanitary stainless steel housing (for humid food processing environments)
6. Recommended Matching Cables

Sommario

1. Istruzioni di sicurezza
2. Unboxing Standard Parts List
3. Specifiche di installazione meccanica (Bracket, Coppia, Dimensioni, Requisiti di autorizzazione)
4. M8 4-Pin Electrical Wiring Definition & Wiring Procedures
5. On-site Optical Alignment & Distance Adjustment Operations
6. Light-on / Dark-on Mode Switching
7. LED Indicator Status Explanation
8. Environmental Installation Prohibitions & Requisiti di protezione
9. Manutenzione ordinaria & Cleaning Standards
10. Matrice di risoluzione dei problemi
11. Selection of Matching Cables & Spare Parts
12. Mandatory Safety Instructions
13. Cut off DC24V power supply before wiring. Hot plug/unplug of M8 connector is forbidden to avoid breakdown of output chip.
14. Rated power supply range is limited to DC 10～30V; AC220V or AC110V input is strictly prohibited, which will burn the sensor instantly.
15. Massimo. output load is 100mA. Direct driving of solenoid valves or contactors is forbidden; add relay isolation if high-power loads need to be driven.
16. Drilling, grinding or disassembling the sensor housing is prohibited. Damaged IP67 seal will result in loss of dustproof and waterproof performance.
17. Prevent strong light from directly irradiating the optical window (sunlight, welding arc, high-power spotlights), which causes false triggering and detection failure.
18. Avoid heavy impact or dropping; offset internal optical path will permanently degrade detection stability.
19. Unboxing Standard Parts List

Sensor Main Unit: WTB8-P2231 ×1

Standard Mounting Accessory: BEF-W100-A stainless steel bracket ×1

M3 mounting screws, flat washers & rondelle elastiche (supplied with bracket)

No factory-supplied cable; M8 4-pin straight cable shall be purchased separately

3. Specifiche di installazione meccanica

3.1 Dimensioni complessive

W11mm × H31mm × Depth 20mm; symmetric M3 internal threaded mounting holes on both sides.

3.2 Bracket Mounting Steps

1. Secure BEF-W100-A bracket to equipment sheet metal or aluminum extrusion and pre-tighten screws.
2. Clip the sensor into the bracket slot, align bilateral M3 holes, and pass through M3 bolt, flat washer and spring washer.
3. Standard Tightening Torque: 1.8 Nm

Insufficient torque: Vibration causes sensor offset and light spot drift;

Excessive torque: Thread stripping, housing deformation and optical path misalignment.

4. Fine-tune vertical & horizontal angles of the sensor to fully cover target surface with red light spot, then lock all bolts.

3.3 Requisiti di spazio per l'installazione (Critical for Background Suppression)

1. Reserve a minimum clearance of 30mm between sensor optical window and fixed rear background; otherwise background interference leads to permanent false ON signal.
2. Campo di rilevamento standard: 40～300mm (90% high-reflective white object); 30～40mm is critical range susceptible to material interference.
3. Do not place metal, mirror or high-reflective panels closely behind the sensor; intense diffuse reflection will disable background suppression.
4. Pipeline installation: Align light spot to workpiece center, avoid conveyor joints, rollers and metal supports.
5. Multiple sensors mounted side-by-side: Adjacent sensor spacing ≥50mm to prevent mutual red light crosstalk interference.

3.4 Permitted / Prohibited Installation Environments

✅ Permitted: Dry workshop, light dust, intermittent water spray (IP67 temporary water resistance), environment of -25℃~+55℃

❌ Prohibited: Continuous immersion, strong corrosive acid/alkali liquid, long-term cutting oil splash, temperature above +55℃ or below -25℃, areas beside heavy electromagnetic cabinets (inverter, high-power motors)

4. Electrical Wiring Specifications

4.1 M8 4-Pin Straight Connector Fixed Pin Definition

4.2 Wiring Operation Steps

1. Confirm power supply cut off, insert M8 connector straight into the slot at sensor tail, tighten thread clockwise without brute force.
2. Route cables away from power cables and inverter output lines with separation ≥10cm to avoid electromagnetic interference.
3. Cable bending radius ≥5× cable outer diameter; hard folding or long-term extrusion of cable root is forbidden.
4. Fit a 4A slow-blow fuse in power circuit to protect sensor against short-circuit damage.

4.3 PNP Output Matching Instruction

Connect PLC input common terminal to 24V negative; connect black signal wire of sensor directly to PLC input point. No external pull-up resistor required.

5. Optical Alignment & Distance Adjustment (4-turn Precision Potentiometer)

5.1 Alignment Operation

1. Dopo l'accensione, green power LED stays steady; observe red light spot at front end.
2. Adjust sensor angle to fully cover target workpiece without partial spot falling on background bracket.

5.2 Potentiometer Adjustment Flow (Background Suppression Calibration)

1. Place target workpiece at maximum sensing distance (300mm), slowly turn potentiometer clockwise until orange output LED just lights up.
2. Remove workpiece, orange LED must turn off; if it remains on, background interference exists — increase distance between sensor and background or fine-tune potentiometer counterclockwise.
3. Repeat placing & removing workpiece for verification: LED lights when workpiece is present, extinguishes when absent, no frequent flashing means calibration completed.
4. The potentiometer supports 4-turn adjustment with high fine-tuning precision; avoid excessive rotation each time.
5. Light-on / Dark-on Mode Switching

Small toggle switch on sensor side:

l (Light-on): Output ON when light spot is blocked by object (orange LED illuminated), default mode for pipeline workpiece presence detection.

D (Dark-on): Output ON when no object exists; signal cut off when workpiece arrives, suitable for empty position & missing material alarm.

7. Dual-Color LED Indicator Status Table

8. Environmental Installation Protection Details
9. Polveroso & oily workshops: Wipe optical window regularly to prevent oil & carbon deposit blocking optical path; spraying paint on sensor housing is prohibited.
10. Humid/mist environments: Apply a thin layer of waterproof silicone grease on M8 connector thread to prevent moisture penetration into connector interior.
11. Temperature Limits:

Operating Range: -25℃ ~ +55 ℃

Magazzinaggio & Transportation Range: -40℃ ~ +70 ℃

Install simple baffles in high-temperature areas to block hot exhaust air from equipment.

4. EMI Suppression: Use PVC shielded cable for sensor wiring, ground shield at single end; keep cables away from servo motors, contactors and inverters.
5. Manutenzione ordinaria & Pulizia
6. Cleaning Tools: Dust-free cloth, isopropyl alcohol (anhydrous ethanol); steel wool, sandpaper, acetone and strong corrosive detergents are strictly forbidden.
7. Wiping Sequence: Blow off dust first, gently wipe optical window with alcohol, power on after complete air-drying.
8. Ciclo di ispezione:

Clean packaging line: Una volta al mese

Metal processing / heavy dust production line: Once per week

4. Quarterly Inspection Items: Bracket screw torque, cable root cracking, loose connector and potentiometer offset.
5. Matrice di risoluzione dei problemi

11. Recommended Matching Installation Cables (M8 4-Pin Straight)
12. YF8U14-020VA3XLEAX 2m straight cable
13. YF8U14-050VA3XLEAX 5m straight cable
14. STE-0804-G M8 4-pin terminal base (for internal transition in control cabinet)