Sick
Sick WT18-3N110 NPN Photoelectric Sensor
Compact photoelectric sensor with background suppression, NPN complementary output, 10–30 V DC supply, IP67-rated ABS housing, and 2 m PVC cable
- Background suppression detects objects reliably up to 700 mm
- Infrared LED at 870 nm provides consistent sensing in varied lighting
- NPN complementary output switches up to 100 mA for direct load control
- IP67 enclosure withstands dust and water immersion in harsh environments
- Compact 17.6 x 75.5 x 33.5 mm housing fits tight installation spaces
Sick WT18-3N110 photoelectric sensor
The Sick WT18-3N110 is a rectangular photoelectric proximity sensor that uses background suppression for reliable object detection. It operates on a 10 V DC to 30 V DC supply and provides an NPN complementary output with light/dark switching. The sensor suits industrial automation tasks where precise presence detection is required. Its 2 m PVC cable offers a straightforward four-wire connection.
Sensing range 50 mm to 700 mm with 870 nm infrared
The sensor detects objects from 50 mm up to 700 mm using an 870 nm infrared LED, with a maximum range extending to 10 mm. At 400 mm the light spot measures Ø 20 mm, giving a focused detection area. A four-turn potentiometer allows fine adjustment of the switching point. The 700 Hz switching frequency and sub-700 µs response time support fast production lines.
IP67 enclosure rated for –40 °C to +60 °C operation
The ABS housing and PMMA optics meet IP67, protecting the electronics against dust and temporary immersion. Power consumption stays at 55 mA with ripple below 5 Vpp, and the output handles up to 100 mA. Circuit protection covers supply reversal, short circuits and inductive loads. The unit weighs 120 g and carries UL file numbers NRKH.E181493 and NRKH7.E181493.
Highlights
- Background suppression detects objects reliably up to 700 mm
- Infrared LED at 870 nm provides consistent sensing in varied lighting
- NPN complementary output switches up to 100 mA for direct load control
- IP67 enclosure withstands dust and water immersion in harsh environments
- Compact 17.6 x 75.5 x 33.5 mm housing fits tight installation spaces
Specifications
| Brand | SICK |
|---|---|
| Model | SICK WT18-3N110 |
Questions about this item
Will the 10 V DC to 30 V DC supply range let me run the WT18-3N110 on the same rail as my older PLC modules?
The sensor operates from 10 V DC to 30 V DC with a 55 mA current draw, so it can share a rail that stays within those limits and provides enough current for the load.
How can I verify the WT18-3N110 is detecting correctly after wiring the 4-wire cable?
Turn the 4-turn potentiometer until the output toggles at the desired distance up to 700 mm, then confirm the complementary NPN signals switch cleanly at the 700 Hz rate.
Does the 2 m PVC cable come terminated, and do I need a separate mounting bracket?
The sensor ships with a 2 m, 4-wire PVC cable attached; mounting hardware is not included and must be sourced separately.
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