Many engineers reviewing Omron E3FA-RN21 also explore Omron Photoelectric Sensor, Omron E3Z Sensor and Omron Sensors, ensuring they don’t miss strong alternatives before finalizing procurement decisions.
Omron E3FA-RN21 Photoelectric Sensor
The Omron E3FA-RN21 Photoelectric Sensor is a Retro-reflective with MSR function, featuring a 0.1 to 4 m sensing range using the E39-R1S reflector, red LED light source, and 10–30 VDC power supply with NPN output. It belongs to the Omron industrial automation range under the Omron Photoelectric Sensors category and the Omron E3FA Series. Built with a durable plastic housing, it includes an M12 connector for secure electrical connection, ensuring stable operation in industrial sensing environments.
| Brand | Omron |
| Product Type | Photoelectric Sensor |
| Model Number | E3FA-RN21 |
Omron E3FA-RN21 Photoelectric Sensor – Technical Specifications
| Specification | Value |
|---|---|
| Sensing Method | Retro-reflective with MSR function |
| Sensing Distance | 0.1 to 4 m with E39-R1S |
| 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: 2 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 | ABS, PMMA, POM, POM |
| Weight | Approx. 20 g/ Approx. 10 g |
The Omron E3FA-RN21 Photoelectric Sensor from Omron Corporation belongs to the Omron E3FA Series and is designed for accurate object detection in industrial automation. It operates on a 10 to 30 VDC power supply and provides an NPN open collector output. The model features a retro-reflective sensing method with MSR function and achieves a sensing distance of 0.1 to 4 meters using the E39-R1S reflector. Its durable M18 cylindrical plastic housing ensures dependable operation in harsh industrial environments with IP67 and IP69K protection ratings.
Used widely across industrial automation setups, this sensor delivers consistent detection on conveyor systems, packaging equipment, and assembly lines. The retro-reflective design enables reliable sensing even for glossy or curved surfaces, while the MSR function minimizes false reflections. Its single-turn sensitivity adjuster simplifies setup, making it suitable for production lines where stable performance and reduced maintenance time are critical.
The Omron E3FA-RN21 Photoelectric Sensor provides reliable sensing performance with an M12 connector configuration for easy installation. For users requiring a PNP output alternative, the Omron E3FA-RP21 Photoelectric Sensor offers identical sensing distance and MSR function. Those preferring a pre-wired cable type can opt for the Omron E3FA-RN11 2M Photoelectric Sensor, which uses a 2-meter cable instead of an M12 connector. For environments demanding a metal body design, the Omron E3FB-RN21 Photoelectric Sensor provides enhanced durability while maintaining the same detection range and output type. The Omron E3FA-RN21 thus offers a dependable, compact solution for reflective sensing applications.
Engineered for efficiency, the Omron E3FA-RN21 Photoelectric Sensor combines high stability, quick response time, and strong resistance to water and dust. With IP69K-rated protection, a −25°C to 55°C operating range, and fast 0.5 ms response time, it ensures uninterrupted operation in demanding factory environments. Built under the trusted Omron brand, this sensor provides a cost-effective and reliable sensing solution for industrial automation tasks across India’s manufacturing, material handling, and packaging sectors.
