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Small rectangular plastic sensor housing with M8 connector visible

Sick

SICK WTB140-P420 Photoelectric Proximity Sensor PNP

SKU CH-TMJ4-BKNDE

Photoelectric proximity sensor with background suppression, 15–500 mm range, PNP output, IP67 plastic housing, 10–30 V DC supply

  • Background suppression detects objects reliably
  • 15 mm to 500 mm sensing range covers close and distant targets
  • Visible red LED at 680 nm simplifies alignment
  • IP67 enclosure withstands dust and water ingress
  • PNP output with selectable light/dark switching suits varied control logic

SICK WTB140-P420 Photoelectric Proximity Sensor

The SICK WTB140-P420 is a photoelectric proximity sensor with background suppression for object detection in industrial automation. It operates on 10 V DC to 30 V DC supply voltage with a PNP switching output. The rectangular plastic housing measures 11 mm by 31 mm by 20 mm and carries an IP67 enclosure rating. A visible red LED light source at 680 nm wavelength provides a sensing range from 15 mm to 500 mm.

Ideal for automation engineers needing reliable

This sensor suits applications requiring background suppression and selectable light or dark switching via an L/D control cable. The 0.5 ms response time supports fast production line processes. Buyers who need analog output or longer sensing distances beyond 500 mm should look at alternative sensor types. The fixed M8 4-pin connector limits cable replacement flexibility compared to cable-gland models.

Integrates into 10 V DC to 30 V DC control systems

The PNP output connects directly to compatible PLC inputs or relay modules within the specified voltage range. IP67 rating allows installation in wet or dusty environments without additional sealing. The compact 11 mm by 31 mm by 20 mm housing fits tight machine frames where larger cylindrical sensors cannot mount. Operating temperature spans –25 °C to +55 °C for unheated factory floors.

How it compares

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

Price $108.99
Pricier than about 55% of the 5,006 comparable items (median $95.99).

Specifications

Product
Brand nameSICK
Model nameSICK WTB140-P420

Questions about this item

What supply voltage must my system provide for the WTB140-P420 sensor?

The sensor operates on 10 V DC to 30 V DC with a ±10 % ripple allowance, drawing up to 30 mA.

Can I use this sensor with an older NPN-input PLC input card?

No, the WTB140-P420 provides a PNP switching output; it requires a PNP-compatible input or a relay interface.

How do I verify the sensor is detecting correctly after wiring it?

The visible red LED at 680 nm lets you see the light spot, and the selectable L/D control cable toggles light/dark switching for immediate functional confirmation.

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