Sick GRL18S-F233Y Photoelectric Sensor
Sick GRL18S-F233Y photoelectric sensor delivers 6 m sensing range, PNP output, dual lens design, IP67 M18 housing cylindrical threaded. This Sick Dual Lens Cylindrical Photo Sensor operates using visible red PinPoint LED at 650 nm, supports 10–30 V DC, and switches at 1,000 Hz. It belongs to Sick sensing solutions, listed under Sick Photoelectric Sensors and the GR Series for industrial automation.
| Brand | Sick |
| Product Type | Photolectric Sensor |
| Product | GRL18S-F233Y |
Sick GRL18S-F233Y Photoelectric Sensor – Technical Specifications
| Specification | Value |
|---|---|
| Functional principle | Photoelectric retro-reflective sensor |
| Functional principle detail | Dual lens |
| Dimensions (W x H x D) | 18 mm x 18 mm x 38.1 mm |
| Housing design (light emission) | Cylindrical |
| Thread diameter (housing) | M18 x 1 |
| Optical axis | Axial, fully flush |
| Sensing range max. | 0.03 m ... 7.2 m |
| Sensing range | 0.06 m ... 6 m |
| Type of light | Visible red light |
| Light source | PinPoint LED |
| Light spot size (distance) | Ø 175 mm (7 m) |
| Wave length | 650 nm |
| Adjustment | None |
| Indication | LED green, LED yellow |
| Supply voltage UB | 10 V DC ... 30 V DC |
| Ripple | < 5 Vpp |
| Current consumption | 30 mA |
| Switching Output | PNP |
| Switching mode | Dark switching |
| Signal voltage PNP HIGH/LOW | VS - (≤ 3 V) / approx. 0 V |
| Output current Imax. | ≤ 100 mA 3) |
| Response time | < 500 µs 4) |
| Switching frequency | 1,000 Hz 5) |
| Connection type | Connector M12, 3-pin |
| Protection class | III |
| Housing material | Metal, Nickel-plated brass and ABS |
| Optics material | Plastic, PMMA |
| Enclosure rating | IP67 |
| Items supplied | Fastening nuts (2 x) |
| Ambient operating temperature | –25 °C ... +55 °C 9) |
| Ambient temperature, storage | –40 °C ... +70 °C |
The GRL18S-F233Y Sick Dual Lens Cylindrical Photo Sensor is a retro-reflective photoelectric sensor designed for reliable object detection. The GRL18S-F233Y Sick Dual Lens Cylindrical Photo Sensor features a 0.06–6 m sensing range, stable PNP switching output, and a precise dual lens optical system. It belongs to the GR Series and is commonly integrated into industrial automation environments.
This sensor is used in conveyors, packaging machines, automated assembly stations, and material handling systems. Retro-reflective sensing enables consistent detection with reflectors, while the fully flush axial optical axis supports compact mounting. With fast response and dependable signal behavior, it ensures stable operation in continuous automation processes.
The GRL18S-F233Y from Sick combines IP67 enclosure protection, metal and ABS housing, and M12 connector interface for long-term industrial reliability. Sick manufacturing standards ensure consistent optical performance, electrical stability, and suitability for demanding factory automation applications.

