Many procurement teams check E3RA-RP21 against Omron SMPS 24V 10A, E3Z D61 2M and Omron Sensors before signing purchase orders, verifying quality, compliance, and after-sales support availability.
Omron E3RA-RP21 Photoelectric Sensor
The Omron E3RA-RP21 Photoelectric Sensor features Retro-reflective with MSR function providing a precise 0.1–3 m sensing range and PNP output for reliable object detection. It operates on a 10–30 VDC power supply and connects M12 connector. Manufactured by Omron under the Omron Photoelectric Sensors category, this model belongs to the Omron E3RA Series. Equipped with a red LED (624 nm) light source, it supports Light-ON/Dark-ON selectable mode, 0.5 ms response time, 25 mA current consumption, and 100 mA load current for stable industrial performance.
| Brand | Omron |
| Product Type | Photoelectric Sensor |
| Model Number | E3RA-RP21 |
Omron E3RA-RP21 Photoelectric Sensor – Technical Specifications
| Specification | Value |
|---|---|
| Sensing Method | Retro-reflective with MSR function |
| Sensing Distance | 0.1 to 3 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 | PNP |
| 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 E3RA-RP21 Photoelectric Sensor from Omron Corporation is a retro-reflective sensor with MSR function designed for precision object detection in automation lines. It offers a sensing distance of 0.1 to 4 m (E39-R1S reflector) and operates on a 10 to 30 VDC power supply. With a PNP open collector output and a radial optical axis, it belongs to the Omron E3RA Series, ideal for industrial automation applications where reliable and interference-free detection is required in compact setups.
Used across conveyor systems, packaging machines, and automated assembly stations, this model ensures consistent detection of reflective targets even under variable lighting. Its high-speed response time of 0.5 ms supports precise counting and position control in motion-based operations. The IP67 and IP69K protection ratings provide dependable operation in dusty or high-pressure washdown environments, reducing maintenance needs and enhancing uptime in manufacturing facilities.
The Omron E3RA-RP21 Photoelectric Sensor provides stable retro-reflective sensing with PNP output and M12 connector for quick installation. Users needing the same configuration with NPN output can select the Omron E3RA-RN21 Photoelectric Sensor, which offers identical sensing range and build with NPN compatibility. For installations requiring a pre-wired connection instead of a detachable connector, the Omron E3RA-RP11 2M Photoelectric Sensor provides a 2-meter cable version. Meanwhile, for applications preferring a diffuse-reflective sensing approach without a reflector, the Omron E3RA-DP21 Photoelectric Sensor offers 100 mm sensing distance with a PNP output and M12 connector. The Omron E3RA-RP21 Photoelectric Sensor remains the preferred option for retro-reflective setups in compact industrial machinery.
Engineered for accuracy and durability, the Omron E3RA-RP21 Photoelectric Sensor reinforces Omron’s credibility in industrial automation. It combines a robust ABS plastic housing, single-turn sensitivity adjustment, and radial design for simplified alignment in tight spaces. With a wide operating temperature range from -25°C to 55°C and reliable PNP output performance, it ensures dependable object detection in conveyors, labeling machines, and packaging lines across India’s industrial sectors.
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