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Small rectangular plastic sensor with 2 m PVC cable

Sick

Sick WTV4-3N1321S49 Miniature Photoelectric Sensor NPN

SKU CH-B9WT-C16KQ

Miniature photoelectric sensor with background suppression detects objects from 5 mm to 50 mm using an infrared PinPoint LED and provides an NPN switching output on a 2 m cable

  • Detects uneven shiny objects with background suppression
  • PinPoint LED gives precise 7 mm spot at 40 mm
  • 1000 Hz switching frequency for fast response
  • IP67 and IP66 rated for harsh environments
  • Operates from –40 °C to +60 °C

Miniature Photoelectric Sensor NPN

The Sick WTV4-3N1321S49 is a rectangular proximity sensor with background suppression for detecting objects at close range. It uses an infrared PinPoint LED with an 880 nm wavelength and a 5-turn potentiometer for adjustment. The NPN output switches on light detection with a response time under 0.5 ms and a 1,000 Hz switching frequency. It suits automation tasks needing reliable detection of uneven or film-wrapped items.

Replaces basic diffuse sensors

This unit upgrades from simple diffuse sensors that struggle with shiny or transparent surfaces. The background suppression ignores objects beyond the set 50 mm range while the V-optics improve detection of challenging targets. The jump is worth it when ambient light varies or when targets reflect unpredictably. The 2 m PVC cable and IP66/IP67 ratings allow installation in harsh industrial environments.

Check supply voltage and wiring

Verify your control system provides 10 V DC to 30 V DC with ripple below 5 Vpp. Confirm the NPN light-switching logic matches your PLC input requirements and that 100 mA output current is sufficient. The 3-wire cable uses 0.14 mm² conductors with a 3.4 mm outer diameter. Ensure the –40 °C to +60 °C operating range covers your application conditions.

How it compares

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

Price $297.99
Pricier than about 87% of the 5,006 comparable items (median $95.99).

Specifications

Product
Brand nameSICK
Model nameSICK WTV4-3N1321S49

Questions about this item

What are the housing dimensions of the WTV4-3N1321S49 sensor?

The rectangular housing measures 16 mm wide, 39.5 mm high and 12 mm deep, weighing 30 g with an ABS plastic body and PMMA optics.

How do I set the sensing distance on the potentiometer and what is a common mistake?

Turn the 5-turn potentiometer while the target is at the desired distance; a common error is adjusting it with no object present, which leaves the background suppression unset.

When should I replace the 2 m PVC cable on this sensor?

Replace the Ø 3.4 mm cable if the insulation is cracked, conductors are exposed, or the enclosure rating of IP67 and IP66 can no longer be maintained.

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