Technical Overview
The Omron E3FB-RP21 is an E3FB M18 retro-reflective photoelectric sensor with a nominal sensing distance of 0.1 to 4 m with E39-R1S reflector. It uses PNP open-collector output and a M12 connector. The nickel-brass housing, 624 nm red LED and 0.5 ms response support industrial object detection. Light-ON or Dark-ON operation is selected by wiring; confirm reflector, target and receiver compatibility for the installation.
Omron E3FB-RP21 M18 Retro-reflective Photoelectric Sensor with 0.1 to 4 m with E39-R1S reflector sensing distance, PNP output and M12 connector.
Key Features
- Retro-reflective sensing
- 0.1 to 4 m with E39-R1S reflector nominal sensing distance
- M18 nickel-brass housing
- Red LED, 624 nm
- PNP open-collector output
- M12 connector
- Light-ON / Dark-ON selectable by wiring
- 0.5 ms response
- IP67/IP69K protection
Retro-reflective | 0.1 to 4 m with E39-R1S reflector | PNP
Technical Specification Matrix
| Parameter | Value |
| Manufacturer | Omron |
| Series | E3FB |
| Product type | M18 photoelectric sensor |
| Sensing method | Retro-reflective |
| Sensing distance | 0.1 to 4 m with E39-R1S reflector |
| Output | PNP open collector |
| Connection | M12 connector |
| Thread size | M18 |
| Housing material | Nickel-brass |
| Light source | Red LED, 624 nm |
| Operation mode | Light-ON / Dark-ON, selected by wiring |
| Response time | 0.5 ms |
| Rated supply voltage | 10 to 30 VDC |
| Degree of protection | IP67/IP69K |
| Reflector | E39-R1S reflector required; sold separately |
| Physical Weight (kg) | Not stated in the checked manufacturer product data. |
| Dimensions L x W x H (cm) | See manufacturer dimensional data; no complete overall L × W × H value stated. |
| Supply status | Unknown; exact specifications are confirmed, current supply status was not established. |
Suggested applications
Engineering suggestions require suitability checks for your installation.
1. Conveyor object detection
Detect passing objects or workpieces at a fixed point on a production conveyor.
Potential use
Set the retro-reflective sensor within its rated 0.1 to 4 m with E39-R1S reflector range and match the PNP output to a compatible controller input.
conveyor
object detection
2. Machine part counting
Provide a photoelectric switching point for counting or presence monitoring in an automated machine.
Potential use
Use the specified m12 connector and select Light-ON or Dark-ON wiring for the required logic.
machine automation
part counting