Before procurement teams confirm E3FB-RN21, they typically review Omron Photoelectric Sensor, E3Z D61 2M and Omron Sensors to double-check performance ratings, stock availability, and supplier credibility carefully.
Omron E3FB-RN21 Photoelectric Sensor
The Omron E3FB-RN21 Photoelectric Sensor features retro-reflective with MSR function, offering a 0.1–4 m sensing range using the E39-R1S reflector for reliable object detection. It operates on a 10–30 VDC power supply and provides NPN output with an M12 connector for quick installation. Manufactured by Omron under the Omron Photoelectric Sensors category, this model belongs to the Omron E3FB Series. Built with a metal housing, red LED (624 nm) light source, Light-ON/Dark-ON selectable mode, and 0.5 ms response time, it ensures precise and durable performance in industrial automation.
| Brand | Omron |
| Product Type | Photoelectric Sensor |
| Model Number | E3FB-RN21 |
Omron E3FB-RN21 Photoelectric Sensor – Technical Specifications
| Specification | Value |
|---|---|
| Sensing Method | Retro-reflective with MSR function |
| Sensing Distance | 0.1 to 4 m |
| Standard Sensing Object | Opaque: 75 mm dia.min. |
| Light Source | Red LED (624 nm) |
| Power Supply Voltage | 10 to 30 VDC (include voltage ripple of 10%(p-p) max.) |
| Output configuration | NPN |
| Connection Method | M12 Connector |
| Current Consumption | 25 mA max. |
| Control Output | Load current: 100 mA max. (Residual voltage: 3 V max.), Load power supply voltage: 30 VDC max. |
| Operation Mode | Light-ON/Dark-ON selectable by wiring |
| Response Time | 0.5 ms |
| Sensitivity Adjustment | One-turn adjuster |
| Indicators | Operation indicator (orange) Stability indicator (green) |
| Ambient Illumination | Incandescent lamp: 3,000 lx max./ Sunlight: 10,000 lx max. |
| Ambient Temperature Range | Operating: -25 to 55°C/ Storage: -40 to 70°C (with no icing or condensation) |
| Ambient Humidity Range | Operating: 35 to 85%/ Storage: 35 to 95% (with no condensation) |
| Insulation Resistance | 20 MΩ min. at 500 VDC |
| Dielectric Strength | 1,000 VAC at 50/60 Hz for 1 min. between current-carrying parts and case |
| Vibration Resistance | Destruction: 10 to 55 Hz, 1.5 mm double amplitude for 2 hours each in X, Y and Z directions |
| Shock Resistance | Destruction: 500 m/s2 3 times each in X, Y and Z directions |
| Protection Circuits | Power supply reverse polarity protection, Output short-circuit protection, and Output reverse polarity protection |
| Degree of Protection | IEC: IP67, DIN 40050-9: IP69K |
| Material | Nickel-brass, PMMA, POM, Nickel-brass |
| Weight | Approx. 50 g/ Approx. 20 g |
The Omron E3FB-RN21 Photoelectric Sensor belongs to the Omron E3FB Series and is widely used in industrial automation systems. It features a retro-reflective sensing method with MSR function, a sensing distance from 100 mm to 4 m, and a 10 to 30 VDC power supply. With a NPN open collector output and an M12 connector, it ensures easy installation and dependable connectivity. The sensor’s robust nickel-plated brass housing and IP67/IP69K protection rating make it ideal for demanding environments that require durability and stable performance.
Widely adopted in conveyor systems, packaging machines, and automated assembly setups, this sensor provides precise detection and reliable output even under challenging industrial conditions. Its fast 0.5 ms response time supports accurate object sensing, preventing downtime and ensuring smooth production flow. The single-turn sensitivity adjuster simplifies setup, while its stable light emission minimizes false triggers, making it suitable for various automation tasks in food, pharmaceutical, and manufacturing lines.
The Omron E3FB-RN21 Photoelectric Sensor is a metal-bodied, retro-reflective unit offering reliable NPN output through an M12 connector. For users requiring a PNP variant, the Omron E3FB-RP21 Photoelectric Sensor provides similar performance with PNP output for control circuits. Those preferring a pre-wired version can consider the Omron E3FB-RN11 2M Photoelectric Sensor, which includes a fixed 2 m cable instead of a connector. Alternatively, applications needing diffuse-reflective operation can use the Omron E3FB-DN21 Photoelectric Sensor, designed for shorter sensing distances and direct reflection detection. The Omron E3FB-RN21 ensures consistent object detection with minimal maintenance requirements.
Built by Omron Corporation, the E3FB-RN21 model provides reliable photoelectric sensing performance for modern industrial environments. With its red LED light source, 0.5 ms response time, and metal M18 housing, it delivers precision and longevity across automation systems. This model reinforces Omron’s reliability in sensor technology, offering dependable operation in production lines across India’s automation sector. Its stable detection and environmental resistance make it a trusted choice for long-term industrial use.
