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Rectangular plastic sensor housing, 27 by 92 by 70 mm, IP67 rated

Sick

Sick WT34-R220 Photoelectric Proximity Sensor

SKU CH-J3HE-Q7Y9A

Photoelectric proximity sensor with background suppression, 100 mm to 2,500 mm sensing range, infrared LED, adjustable off-delay 0.5 s to 10 s, relay change-over output, 20 V to 250 V AC/DC supply.

  • Detects objects up to 2,500 mm with background suppression
  • Infrared LED spot 80 mm at maximum range
  • Adjustable off-delay 0.5 s to 10 s via selector
  • Relay change-over contacts switch 4 A at 250 V AC or 24 V DC
  • IP67 ABS housing operates from –40 °C to +60 °C

Industrial Detection Sensor

The Sick WT34-R220 is a photoelectric proximity sensor that uses background suppression to detect objects reliably across varied surfaces. It suits electricians and automation engineers who need consistent presence sensing in packaging, material handling or assembly equipment.

Thermals Noise And Power Draw

The unit operates from 20 V to 250 V AC or DC while drawing less than 2 VA, so heat output stays negligible in cabinet installations. An IP67 enclosure and a temperature range of –40 °C to +60 °C keep performance stable without active cooling or audible noise.

Relay Output Upgrade

The sensor replaces older inductive or mechanical limit switches when non-contact detection over longer distances is required. The jump is worth it for applications that demand adjustable sensing up to 2 500 mm, selectable light or dark switching and a relay output rated at 4 A for direct load control.

Highlights

  • Detects objects up to 2,500 mm with background suppression
  • Infrared LED spot 80 mm at maximum range
  • Adjustable off-delay 0.5 s to 10 s via selector
  • Relay change-over contacts switch 4 A at 250 V AC or 24 V DC
  • IP67 ABS housing operates from –40 °C to +60 °C

Specifications

BrandSICK
ModelSICK WT34-R220

Questions about this item

How is the WT34-R220 mounted and wired, and what step do installers often miss?

The rectangular ABS housing measures 27 mm by 92 mm by 70 mm and uses a terminal connection with an M16 gland. The step often missed is setting the light/dark selector and the off-delay switch (0.5 s or 10 s) before powering the 20–250 V AC/DC supply.

What maintenance or replacement will the WT34-R220 need over time?

The relay output has electrically isolated change-over contacts rated for 4 A at 250 V AC or 24 V DC. Under normal switching frequency of 10 Hz the contacts will eventually wear and require sensor replacement; the plastic ABS housing and IP67 seal need only occasional cleaning of the infrared light spot.

What is the first limit reached when the WT34-R220 runs continuously in a hot environment?

The ambient operating temperature tops out at +60 °C. Above that the sensor exceeds its rated range before the 10 ms response time or 10 Hz switching frequency become limiting factors.

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