Baluff BOS 18M-PA-PR20-S4 Photoelectric Sensor
The Baluff BOS 18M-PA-PR20-S4 Photoelectric Sensor offers 0...7 m range with red LED light and stable retroreflective operation overall. As part of the Baluff photoelectric sensor lineup, it supports medium-range industrial detection with consistent optical response.
This model features a PNP NO/NC interface, Ø 18 x 75 mm nickel-plated brass housing, anti-glare glass sensing surface, and an M12 4-pin connector. Operating from 10...30 VDC, the BOS 18M-PA-PR20-S4 meets CE, UKCA, cULus, and WEEE conformity for use in automated environments.

| Brand | Balluff |
| Product Type | Photoelectric Sensor |
| Model Number | BOS 18M-PA-PR20-S4 |
Baluff BOS 18M-PA-PR20-S4 Photoelectric Sensor – Technical Specifications
| Specification | Value |
|---|---|
| Series | 18M |
| Dimension | Ø 18 x 75 mm |
| Interface | PNP normally open (NO), PNP normally closed (NC) |
| Principle of operation | Photoelectric sensor |
| Principle of optical operation | Retroreflective sensor |
| Special optical feature | - |
| Beam characteristic | Divergent |
| Light type | LED, red light |
| Light spot size | Ø 300 mm at 7 m |
| Range | 0...7 m |
| Connection | Connector, M12x1-Male, 4-pin |
| Housing material | Brass, nickel-plated |
| Material sensing surface | Glass, anti-glare |
| Operating voltage Ub | 10...30 VDC |
| Approval/ Conformity | CE, UKCA, cULus, WEEE |
The Baluff BOS 18M-PA-PR20-S4 Photoelectric Sensor delivers dependable retroreflective sensing for automated systems. With a 0...7 m sensing range, a red LED light source, and a PNP NO/NC switching interface, it supports accurate detection across industrial workflows. As part of the BOS 18M series, this model fits well into automation processes requiring stable response and cylindrical mounting.
In practical applications, the Baluff BOS 18M-PA-PR20-S4 Photoelectric Sensor is used on conveyors, packaging machinery, assembly equipment, and general material-handling lines. Its nickel-plated brass housing, anti-glare glass sensing surface, and defined 300 mm light spot at 7 m ensure consistent performance even in varying light conditions. The M12 connector simplifies wiring and supports reliable integration with control systems.
The Baluff BOS 18M-PA-PR20-S4 Photoelectric Sensor provides consistent detection through its defined optical characteristics, durable housing, and reliable electrical switching. With stable LED output and cylindrical construction, it is suited for continuous industrial use. Engineers value the model for its predictable behavior, dependable build quality, and alignment with Baluff’s reputation for reliable sensing solutions in automation environments.




