Omron E3FB-BP21 Photoelectric Sensor
Omron E3FB-BP21 is a PNP coaxial retro-reflective photoelectric sensor designed for sensing across a specified 500 mm distance. Its red LED operates through a coaxial optical arrangement, keeping the outgoing and returning light paths aligned along the sensing axis. The sensor runs from 10 to 30 VDC and uses an M12 connector for detachable machine wiring. Light-ON or Dark-ON operation can be selected, and response time is specified at 0.5 ms. The M18 cylindrical body uses a nickel-plated brass housing with a stated length of 48 mm. Within the E3FB Series, the E3FB-BP21 provides the connector-based coaxial option. Compact reflective applications can use coaxial retro-reflective photoelectric sensors from Omron Sensor Products.
| Brand | Omron |
| Product | Photoelectric Sensors |
| Model Number | E3FB-BP21 |
Omron E3FB-BP21 Photoelectric Sensor – Technical Specifications
| Specification | Value |
|---|---|
| Sensing Method | Coaxial retro-reflective |
| Shape | Cylindrical axial |
| Sensing Distance | 500 mm |
| Power Supply Voltage | 10 to 30 VDC |
| Output Configuration | PNP |
| Connection Method | M12 Connector |
| Light Source (Wavelength) | Red LED |
| Thread Size | M18 |
| Length | 48 mm |
| Operation Mode | Light-ON/Dark-ON |
| Response Time | 0.5ms |
| Degree Of Protection | IP67/IP69K |
| Material Housing | Brass, nickel plated |
| Features | P-opaquing function, Transparent detection |
The Omron E3FB-BP21 Photoelectric Sensor uses coaxial retro-reflective sensing with a specified 500 mm distance in an M18 cylindrical axial body. A red LED provides the sensing light, while the coaxial arrangement places the outgoing and returning optical paths along the same axis. This format supports applications where a compact reflective sensing path is required. The sensor provides PNP output for compatible PLC and control inputs, with Light-ON or Dark-ON operation selectable according to the machine sequence. It operates from 10 to 30 VDC and consumes 25 mA max. An M12 connector provides detachable electrical wiring, making the sensor easier to remove from an existing cable installation. Response time is specified at 0.5 ms. The nickel-plated brass housing has an M18 threaded form and a stated body length of 48 mm, while IP67 and IP69K enclosure ratings are listed.
For an Omron coaxial retro-reflective sensor requiring PNP switching, M12 connector wiring, and 500 mm sensing, the relevant model is the E3FB-BP21. The supplied specifications also include a P-opaquing function and transparent-object sensing capability. Its connector arrangement supports servicing without removing the machine-side cable. The red LED assists optical alignment, while selectable Light-ON and Dark-ON logic supports different switching sequences. Its specification also matches searches for an Omron PNP photoelectric sensor and Omron M12 retro-reflective sensor. For a related PNP retro-reflective model with a 2000 mm sensing distance and pre-wired 2 m cable, see E3FB-BP12 2M.
