Omron E3FB-DN21 Photoelectric Sensor
Omron E3FB-DN21 is an NPN diffuse-reflective photoelectric sensor designed for object sensing across a specified 100 mm distance. Its red LED directs light toward the target and evaluates the returned signal without requiring a reflector or separate receiving unit. The sensor operates from 10 to 30 VDC and uses an M12 connector, providing detachable wiring for machine installation and replacement. Light-ON or Dark-ON operation can be selected to suit the required control sequence, while the specified response time is 0.5 ms. The M18 cylindrical housing is nickel-plated brass and measures 48 mm in length. Within the E3FB Series, the E3FB-DN21 provides connector-based short-range sensing. Applications needing removable wiring can explore M12 diffuse photoelectric sensors through Omron Industrial Sensor Products.
| Brand | Omron |
| Product | Photoelectric Sensors |
| Model Number | E3FB-DN21 |
Omron E3FB-DN21 Photoelectric Sensor – Technical Specifications
| Specification | Value |
|---|---|
| Sensing Method | Diffuse reflective |
| Shape | Cylindrical axial |
| Sensing Distance | 100 mm |
| Power Supply Voltage | 10 to 30 VDC |
| Output Configuration | NPN |
| 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 |
The Omron E3FB-DN21 Photoelectric Sensor uses diffuse-reflective sensing in an M18 cylindrical axial body for object sensing across a specified 100 mm distance. Its red LED illuminates the target, and the returned optical signal is evaluated directly without using a separate reflector. The NPN output transfers the switching state to compatible PLC inputs and industrial control circuitry. Light-ON or Dark-ON operation can be selected according to the required machine sequence. Operating voltage is 10 to 30 VDC, and current consumption is specified at 25 mA max. An M12 connector provides detachable wiring, allowing the sensing unit to be removed while the machine-side cable remains installed. Response time is specified at 0.5 ms. The nickel-plated brass housing measures 48 mm in length and carries IP67 and IP69K enclosure ratings.
For an Omron M12 diffuse photoelectric sensor requiring NPN output and 100 mm short-range sensing, the matching model is the E3FB-DN21. The connector format distinguishes it from pre-wired versions and can simplify service work where machine cables are already routed through equipment. Direct target reflection removes the need to align another optical unit, while selectable output logic supports different machine-control requirements. The model also fits searches for an Omron NPN M18 sensor and Omron 100 mm photoelectric sensor. For the related NPN version with the same 100 mm sensing distance and a pre-wired 2 m cable, see E3FB-DN11 2M.
