Omron E3ZM-R81 2M Photoelectric Sensor
Omron E3ZM-R81 2M is a PNP retro-reflective photoelectric sensor with an M.S.R. function and supplied sensing values of 4 m [100 mm] and 3 m [100 mm]. An 870 nm infrared LED establishes the optical path, while the PNP output transfers the switching state to compatible PLC and machine-control circuitry. A Light-ON or Dark-ON switch provides alternative control logic, and a one-turn adjuster supports sensing setup. The sensor operates from 10 to 30 VDC, consumes up to 25 mA, and includes a 2 m pre-wired cable for fixed electrical connection. Response time is specified at 1 ms maximum. The E3ZM-R81 2M provides pre-wired PNP sensing within the long-range retro-reflective sensor range across Omron Industrial Products.
| 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 Photoelectric Sensor uses retro-reflective sensing with an M.S.R. function and supplied optical values of 4 m [100 mm] and 3 m [100 mm]. An 870 nm infrared LED establishes the sensing path, while the PNP output transfers the switching state to compatible PLC and machine-control circuitry. Operating power is 10 to 30 VDC, with current consumption specified at 25 mA maximum. The load circuit supports up to 30 VDC and 100 mA, with residual voltage limited to 2 V maximum. A Light-ON or Dark-ON switch allows the output logic to be selected, while a one-turn adjuster supports setup. Response time is 1 ms maximum, and the 2 m pre-wired cable provides fixed electrical connection. Operation and stability indicators provide visual feedback during setup and use.
When the requirement calls for an Omron PNP retro-reflective sensor with fixed cable wiring rather than an M8 connector, the relevant model is the E3ZM-R81. Operating temperature extends from -25 to 55°C, while storage covers -40 to 70°C. The supplied protection functions include reversed supply polarity, output short-circuit protection, mutual-interference prevention, and reversed output-polarity protection. SUS316, methacrylic resin, PES, PEEK, and fluoro rubber are listed among the materials. The 2 m cable differentiates this configuration from the connector-based R66 while retaining the supplied M.S.R. optical arrangement. For a related PNP model using an M8 connector, see E3ZM-R66.
