Technical Specifications
Parameter Specification
Article Number WTB4S-3P2161
Sensing Principle Photoelectric, Background Suppression
Sensing Range 50 - 400 mm
Light Source Red visible LED, 650 nm
Light Spot Diameter ~15 mm at 400 mm
Resolution < 2 mm
Repeat Accuracy < 1 mm
Response Time < 1.5 ms
Switching Frequency 333 Hz
Output Type PNP, NO/NC selectable
Power Supply 10-30 V DC
Current Consumption < 40 mA
Output Current ≤ 200 mA
Connection M12 connector, 4-pin
Operating Temperature -25 °C ... +60 °C
Storage Temperature -40 °C ... +70 °C
Dimensions (L × W × H) 54 × 30 × 15 mm
Weight Approx. 45 g
Protection Rating IP67
Key Features
1. Advanced Background Suppression

Precise detection independent of target color

Constant scanning range regardless of reflectivity

Excellent background discrimination

Reliable operation on shiny surfaces

2. Robust Metal Housing

Stainless steel housing (1.4305)

High resistance to chemicals and corrosion

Suitable for harsh industrial environments

Mechanical durability

3. High Performance

Fast response time (< 1.5 ms)

High switching frequency (333 Hz)

Excellent repeat accuracy (< 1 mm)

Temperature-compensated operation

4. Easy Operation

Teach-in functionality for easy setup

NO/NC output selectable

Bright LED status indicator

Simple mounting and alignment

Electrical Characteristics
Switching State Indicator: Red LED

Short-circuit Protection: Yes

Reverse Polarity Protection: Yes

Voltage Drop: < 2.5 V

Leakage Current: < 10 μA

Ambient Light Immunity: ≤ 30000 Lux

Mechanical Specifications
Housing Material: Stainless steel 1.4305

Window Material: Optically clear polycarbonate

Mounting: M18 threaded barrel

Alignment: Visual alignment aid

Cable Entry: M12 × 1 connector

Environmental Specifications
EMC Immunity: EN 60947-5-2

Vibration Resistance: 10-55 Hz, 2 mm amplitude

Shock Resistance: 30 g, 11 ms duration

Chemical Resistance: Resistant to oils and coolants

Application Areas
Packaging Industry: Product detection and counting

Automotive Manufacturing: Part presence verification

Material Handling: Object positioning on conveyors

Food Processing: Package detection

Electronics: Component presence checking

Logistics: Parcel sorting systems