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Small rectangular plastic sensor with red LED lens and M8 connector

Sick

Sick WL140-2N430 Photoelectric Retro-Reflective Sensor NPN

SKU CH-8MHZ-E9M64

Photoelectric retro-reflective sensor detects objects up to 6.5 m with visible red LED, NPN output and IP67 housing

  • Detects objects up to 6.5 m away with visible red LED light
  • Switches in 0.5 ms for fast automated responses
  • Operates on 10 V to 30 V DC supply voltage
  • IP67 enclosure rating resists dust and water ingress
  • Compact 11 mm x 31 mm x 20 mm housing fits tight spaces

Industrial Photoelectric Sensor

The Sick WL140-2N430 is a photoelectric retro-reflective sensor designed for industrial automation and detection tasks. It operates on a 10 V DC to 30 V DC supply voltage with an NPN switching output suitable for PLC integration. The rectangular plastic housing measures 11 mm x 31 mm x 20 mm and connects via a male M8 4-pin connector. This sensor targets engineers and technicians requiring reliable object detection in compact spaces.

Sustained Detection Performance

The sensor uses a visible red LED light source at 680 nm wavelength to achieve a maximum sensing range of 0.01 m to 6.5 m and a defined sensing range up to 5 m. It maintains a consistent response time of 0.5 ms with a power consumption of 30 mA under continuous operation. Light/dark switching is selectable via a rotary switch, allowing stable logic configuration for varying target reflectivity without signal degradation over extended duty cycles.

Rugged Build and Mounting

The housing uses PBT plastic with PMMA optics, sealed to an IP67 enclosure rating for protection against dust and temporary water immersion. It withstands ambient operating temperatures from –25 °C to +55 °C and storage temperatures down to –40 °C. The M8 4-pin connector ensures a secure, vibration-resistant electrical connection, while the compact rectangular form factor allows installation on tight machine frames or conveyor brackets. UL file numbers NRNT2.E128350 and NRNT8.E128350 confirm compliance.

How it compares

Measured against everything we stock in Electrical Trade Tools & Kits, at today’s prices. Recalculated every night.

Price $136.99
Pricier than about 64% of the 5,006 comparable items (median $95.99).

Specifications

Product
Brand nameSICK
Model nameSICK WL140-2N430

Questions about this item

How much power does the WL140-2N430 draw and what heat can I expect inside the IP67 housing during continuous operation?

The sensor consumes 30 mA from a 10 V DC to 30 V DC supply, with a ±10 % ripple tolerance, and operates in a plastic PBT housing rated IP67 across an ambient range of –25 °C to +55 °C.

What supply voltage and connector must I already have to wire the M8 4-pin plug on this NPN-output sensor?

Provide 10 V DC to 30 V DC with ±10 % ripple and an M8 4-pin female connector; the sensor’s NPN switching output and selectable light/dark mode are configured via the rotary switch on the housing.

Will the 680 nm red LED and 0.5 ms response time work reliably with older reflective tape or legacy PLC inputs I already use?

The visible red LED at 680 nm delivers a sensing range of 0.01 m to 5 m (max. 6.5 m) with a 0.5 ms response time, and the NPN output switches within the same 10 V DC to 30 V DC range common on legacy PLCs.

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