Omron E3ZM-R81 2M Photoelectric Sensor
The Omron E3ZM-R81 2M Photoelectric Sensor offers Retroreflective (with M.S.R. function), Background Suppression (BGS), 4 m [100 mm], 3 m [100 mm] Sensing distance, PNP Output, Pre-wired 2 M Cable, Infrared LED (870 nm), 10 to 30 VDC Power supply voltage, Light-ON/Dark-ON switch
mode. Manufactured by Omron under the Omron Photoelectric Sensors category, this model belongs to the Omron E3ZM Series.
| Brand | Omron |
| Product | Photoelectric Sensors |
| Model Number | E3ZM-R81 2M |
Omron E3ZM-R81 2M Photoelectric Sensor – Technical Specifications
| Specification | Value |
|---|---|
| Sensing Method | Retroreflective (with M.S.R. function) |
| Sensing Distance | 4 m [100 mm], 3 m [100 mm] |
| Standard Sensing Object | Opaque: 75 mm dia. min. |
| Light Source | Infrared LED (870 nm) |
| Power Supply Voltage | 10 to 30 VDC |
| Output Configuration | PNP |
| Connection Method | Pre-wired 2 M Cable |
| Current Consumption | 25 mA max. |
| Control Output | Load power supply voltage: 30 VDC max., Load current: 100 mA max. (Residual voltage: 2 V max.) |
| Operation Mode | Light-ON/Dark-ON switch |
| Response Time | Operate or reset: 1 ms max. |
| Sensitivity Adjustment | One-turn adjuster |
| Indicators | Operation indicator (yellow), Stability indicator (green) (Emitter has only power supply indicator (green).) |
| Ambient Illumination | Incandescent lamp: 3,000 lx max. Sunlight 10,000 lx max. |
| Ambient Temperature Range | Operating: -25°C to 55°C, Storage: -40°C 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 |
| 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, DIN 40050-9: IP69K |
| Material | SUS316, Methacrylic resin, PES (polyether sulfone), PEEK (polyether ether ketone), Fluoro rubber |
| Weight | Approx. 90 g |
The Omron E3ZM-R81 2M is a reliable retroreflective photoelectric sensor engineered with mutual interference suppression (MSR) to deliver precise long-range object detection. With a sensing distance of up to 4 meters for opaque targets as small as 75 mm, it uses a stable infrared LED (870 nm) as the light source. Operating on 10 to 30 VDC and configured with a PNP output, it includes a pre-wired 2-meter cable for straightforward field wiring and rapid installation.
The sensor offers quick 1 ms response time, Light-ON/Dark-ON switch selection, and a one-turn sensitivity adjuster to simplify setup. Visual indicators for operation and signal stability enable clear diagnostics during use. With advanced protection circuits—such as reversed polarity, output short-circuit, and reversed output polarity protection—it ensures reliable operation in demanding factory automation systems. This makes it ideal for conveyor control, packaging machinery, and heavy-duty object detection tasks.
Built with a rugged SUS316 stainless steel housing and reinforced with materials like PEEK, PES, methacrylic resin, and fluoro rubber, the E3ZM-R81 2M is IP67 and IP69K rated for protection against water, dust, and high-pressure cleaning. It withstands shock, vibration, and temperature extremes, making it a dependable solution for harsh industrial environments.
