Sick Background Suppression Photoelectric Sensor, Block Sensor, 20 → 350 mm Detection Range

SICK W9-3 Series Photoelectric Sensor, IP66/IP67/IP69K, Pin Point LED Light Source - WTB9-3P2261

This photoelectric sensor detects objects using background suppression and is intended for industrial automation tasks. It operates from a DC supply, switches via a PNP output and connects through a male M8 4‑pin interface. The device is housed in Vistal plastic with ingress protection suited to demanding environments and is panel mountable for Compact installations.

Features & Benefits

• Fast response 0.333ms sensor enables high-speed detection for Rapid cycles
  Sensing range 20mm–200mm on low-reflectance targets supports short-range precision
  Pin point LED proximity sensor produces a small light spot for accurate targeting
  PNP output M8 4‑pin sensor carries switching signals for easy PLC integration
  IP67 IP69K industrial sensor resists dust, water and high-pressure cleaning
  Operating range −40 to 60 °C allows use across extreme temperature conditions

**Applications**

• Suitable for pick-and-place verification in automated assembly
  Ideal for conveyor object detection where background suppression is required
  Used with inspection stations to distinguish foreground from background surfaces
  Can be used for packaging-line presence sensing of low-reflectance items
  Suitable for small-part detection in electronics manufacturing cells

What light source does it use and how precise is the beam?

It uses a red pin-point LED with a 650nm Wavelength and a focused spot down to Ø4.5mm at 75mm for accurate targeting.

How is the sensing range affected by object reflectivity?

The maximum detection distance varies with reflectance
white (90% remission) reaches up to 350mm while dark (6% remission) is specified from 20mm to 200mm for reliable switching.

What electrical supply and output constraints apply?

It accepts 10V–30V DC supply with ripple limits and provides a complementary PNP switching output with Imax up to 100mA, reduced at higher ambient temperatures.

How is the unit adjusted and how is status indicated?

Sensitivity is set via a 5‑turn potentiometer and LED indicators show power and received light level for alignment and commissioning.

Notes

For retro-reflective sensors a suitable reflector is required.
For PL80A, PL30A & C110 reflectors see stock nos. 265-2776, 265-2760 & 265-2748 respectively.