Omron E3RB-RP21 Photoelectric Sensor
Omron E3RB-RP21 is a PNP retro-reflective photoelectric sensor with an MSR function for object sensing across a range of 0.1 to 3 m. A 624 nm red LED establishes the optical path toward the reflector, while the PNP output communicates the switching state to compatible PLC inputs and machine-control circuitry. The sensor operates from 10 to 30 VDC, consumes up to 25 mA, and supports load current up to 100 mA. Light-ON or Dark-ON operation can be selected by wiring, while an M12 connector provides detachable connection. Response time is specified at 0.5 ms. Within the E3RB Series, the E3RB-RP21 provides the PNP MSR configuration. Related PNP retro-reflective sensors can be reviewed across Omron Sensing Range.
| Brand | Omron |
| Product | Photoelectric Sensors |
| Model Number | E3RB-RP21 |
Omron E3RB-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 | Nickel-brass, PMMA, POM, Nickel-brass |
| Weight | Approx. 50 g/ Approx. 20 g |
The Omron E3RB-RP21 Photoelectric Sensor uses retro-reflective sensing with an MSR function across a specified range of 0.1 to 3 m. Its 624 nm red LED establishes the optical path toward the reflector, while the PNP output transfers the switching state to compatible PLC inputs and machine-control circuitry. The sensor operates from 10 to 30 VDC and consumes up to 25 mA. Load current is specified at 100 mA maximum, with a maximum load supply voltage of 30 VDC. Light-ON or Dark-ON operation can be selected by wiring, while a one-turn adjuster supports sensitivity setting. An M12 connector provides detachable connection. Response time is specified at 0.5 ms, with orange operation and green stability indicators.
For an Omron PNP retro reflective photoelectric sensor requiring MSR, 0.1 to 3 m sensing, and an M12 connector, the corresponding model is the E3RB-RP21. The stated target is an opaque object with a minimum diameter of 75 mm. Operating temperature extends from -25 to 55°C, while storage ranges from -40 to 70°C without icing or condensation. Power-supply reverse polarity, output short-circuit, and output reverse-polarity protection are included. Its specification also matches searches for an Omron 3 m PNP sensor and Omron metal retro reflective sensor. For the corresponding E3RB retro-reflective configuration with NPN output and the same stated working range, see E3RB-RN21.
