Omron E3Z-R81 2M Photoelectric Sensor
Omron E3Z-R81 2M is a retro-reflective photoelectric sensor with an M.S.R. function and a specified sensing range from 100 mm to 3 m. Its 660 nm red LED sends light toward the reflector, while the PNP output communicates the switching state to compatible industrial control circuitry. Selectable Light-ON and Dark-ON operation allows the output behavior to match different machine-control requirements. The sensor operates from 12 to 24 VDC and includes a 2 m pre-wired cable for electrical connection. Current consumption is specified at 30 mA maximum, while operate or reset time is 1 ms maximum. A one-turn adjuster supports sensing setup. Within the E3Z Series, the E3Z-R81 2M provides fixed wiring within the 3 m PNP retro-reflective sensor range across Omron Industrial Sensor Products.
| Brand | Omron |
| Product | Photoelectric Sensors |
| Model Number | E3Z-R81 2M |
Omron E3Z-R81 2M Photoelectric Sensor – Technical Specifications
| Specification | Value |
|---|---|
| Sensing Method | Retro-reflective with M.S.R. function |
| Sensing Distance | 100 mm to 3 m |
| Light Source | Red LED (660 nm) |
| Power Supply Voltage | 12 to 24 VDC |
| Output Configuration | PNP |
| Connection Method | Pre Wired, Cable Length 2M |
| Current Consumption | 30 mA max. |
| Operation Mode | Light-ON/Dark-ON |
| Response Time | Operate or reset: 1 ms max |
| Sensitivity Adjustment | One-turn adjuster |
| Ambient Illumination | Incandescent lamp: 3,000 lx max. Sunlight: 10,000 lx max |
| Ambient Temperature Range | Operating: −25 to 55°C, Some connector models: −40°C to 55°C * (with no icing or condensation) 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, 50/60 Hz for 1 min |
| 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 | Reversed power supply polarity protection, Output short-circuit protection, Mutual interference prevention, and Reversed output polarity protection |
| Degree Of Protection | IEC, IP67 |
| Material | PBT (polybutylene terephthalate) |
| Weight | Approx. 65 g |
The Omron E3Z-R81 2M Photoelectric Sensor uses retro-reflective sensing with an M.S.R. function across a specified range from 100 mm to 3 m. Its 660 nm red LED sends light toward the reflector, while the PNP output communicates the switching state to compatible industrial control circuitry. The sensor operates from 12 to 24 VDC and consumes up to 30 mA. Light-ON or Dark-ON operation can be selected according to the required switching sequence, while operate or reset time is specified at 1 ms maximum. A one-turn adjuster supports sensing setup, and the 2 m pre-wired cable provides fixed electrical connection. Ambient-light resistance is specified up to 3,000 lx for incandescent illumination and 10,000 lx for sunlight. Reversed power-supply polarity, output short-circuit, mutual-interference, and reversed output-polarity protection are listed.
For an Omron PNP retro-reflective photoelectric sensor requiring an M.S.R. function and 2 m fixed wiring, the relevant model is the E3Z-R81. Operating temperature is stated from -25 to 55°C under the supplied conditions, with storage extending from -40 to 70°C. Operating humidity covers 35% to 85%, while insulation resistance is specified at 20 MΩ minimum at 500 VDC. PBT is listed as the housing material. The 100 mm to 3 m sensing range supports applications where a reflector can be mounted within the stated distance. For a related PNP model using M8 connector wiring with the same stated range, see E3Z-R86.
