Omron E3FB-RP21 Photoelectric Sensor
Omron E3FB-RP21 is a PNP retro-reflective photoelectric sensor designed for a sensing range from 0.1 to 4 m. Its red LED sends light toward a reflector, and changes in the returning optical path provide the switching condition for compatible control circuitry. The sensor operates from 10 to 30 VDC and uses an M12 connector, providing detachable electrical wiring for machine installation and servicing. Light-ON or Dark-ON operation can be selected according to the required control logic, and response time is specified at 0.5 ms. Within the E3FB Series, the E3FB-RP21 provides the connector-based PNP format. Long-range reflector sensing can be compared within PNP retro-reflective photoelectric sensors offered through Omron Industrial Sensors.
| Brand | Omron |
| Product | Photoelectric Sensors |
| Model Number | E3FB-RP21 |
Omron E3FB-RP21 Photoelectric Sensor – Technical Specifications
| Specification | Value |
|---|---|
| Sensing Method | Retro-reflective |
| Sensing Distance | 0.1 to 4 m |
| Light Source | Red LED |
| Power Supply Voltage | 10 to 30 VDC |
| Output Configuration | PNP |
| Connection Method | M12 Connector |
| Current Consumption | 25 mA max. |
| Operation Mode | Light-ON/Dark-ON |
| Response Time | 0.5 ms |
| Degree Of Protection | IP67/IP69K |
| Material | Brass, nickel plated |
| Features | M.S.R. |
The Omron E3FB-RP21 Photoelectric Sensor provides retro-reflective sensing across 0.1 to 4 m using a red LED and reflector-based optical path. Its PNP output transfers the switching condition to compatible PLC inputs, while the 10 to 30 VDC operating range supports common industrial DC power systems. Electrical connection is made through an M12 connector, allowing the sensing unit to be disconnected without removing the machine cable. Current consumption is specified at 25 mA max. Light-ON or Dark-ON operation can be selected according to the required output logic, and response time is 0.5 ms. The metal M18 cylindrical body uses nickel-plated brass and carries IP67 and IP69K protection. MSR functionality supports stable retro-reflective operation.
For an Omron PNP retro-reflective photoelectric sensor requiring a 4 m class range and detachable M12 wiring, the corresponding model is the E3FB-RP21. Its connector format supports sensor replacement while leaving the installed machine cable in place. The specification also matches searches for an Omron M12 retro-reflective sensor and Omron 4 m PNP photoelectric sensor. For the corresponding PNP E3FB model using the same 0.1 to 4 m sensing range with a pre-wired 2 m cable, see E3FB-RP11 2M.
