Omron E3RB-TP21 Photoelectric Sensor
Omron E3RB-TP21 is a PNP through-beam photoelectric sensor designed for object sensing across a distance of up to 15 m. The E3RB-TP21-L emitter sends red LED light toward the E3RB-TP21-D receiver, creating an optical path across the monitored area. The sensor operates from 10 to 30 VDC and provides a PNP output for compatible PLC inputs and machine-control circuitry. Total current consumption is specified at 40 mA maximum, with 25 mA for the emitter and 15 mA for the receiver. An M12 connector provides detachable wiring, while response time is specified at 0.5 ms. Within the E3RB Series, the E3RB-TP21 provides the long-range through-beam configuration. Related 15 m through-beam photoelectric sensors are available across Omron Industrial Sensing Products.
| Brand | Omron |
| Product | Photoelectric Sensors |
| Model Number | E3RB-TP21 |
Omron E3RB-TP21 Photoelectric Sensor – Technical Specifications
| Specification | Value |
|---|---|
| Sensing Method | Through-beam |
| Shape | Cylindrical radial |
| Sensing Distance | 15 m |
| Emitter Number | E3RB-TP21-L |
| Receiver Number | E3RB-TP21-D |
| Power Supply Voltage | 10 to 30 VDC |
| Output Configuration | PNP |
| Connection Method | M12 Connector |
| Light Source (Wavelength) | Red LED |
| Thread Size | M18 |
| Length | 61 mm |
| Operation Mode | Light-ON/Dark-ON |
| Response Time | 0.5ms |
| Degree Of Protection | IP67/IP69K |
| Material Housing | Brass, nickel plated |
The Omron E3RB-TP21 Photoelectric Sensor uses through-beam sensing across a maximum distance of 15 m. The E3RB-TP21-L emitter sends red LED light toward the E3RB-TP21-D receiver, establishing an optical path across the monitored area. When an object enters this path, the receiver changes the resulting PNP output state. The sensor operates from 10 to 30 VDC and uses M12 connectors for detachable electrical connection. Total current consumption is specified at 40 mA maximum, consisting of 25 mA maximum for the emitter and 15 mA maximum for the receiver. Light-ON or Dark-ON operation can be selected according to the required machine logic, while response time is specified at 0.5 ms. The M18 radial housing uses nickel-plated brass.
For an Omron PNP through beam photoelectric sensor requiring a 15 m sensing distance and metal M18 bodies, the relevant model is the E3RB-TP21. Its emitter and receiver arrangement provides a dedicated optical path across wider machine openings and conveyor sections. IP67 and IP69K ratings are listed, supporting installations exposed to dust, moisture, or washdown conditions. The specification also suits searches for an Omron 15 m through beam sensor and Omron PNP emitter receiver sensor. The 0.5 ms response supports object counting, presence sensing, and position monitoring where a long optical path is required. For a related E3RB PNP model using retro-reflective sensing from 0.1 to 3 m, see E3RB-RP21.
