Omron E3Z-LT81 2M Photoelectric Sensor
Omron E3Z-LT81 2M is a laser through-beam photoelectric sensor designed for object sensing across a specified distance of up to 60 m. The sensing arrangement uses the E3Z-LT81-L emitter and E3Z-LT81-D receiver, with a 655 nm red laser diode establishing the optical beam between them. The PNP output communicates the switching state to compatible machine-control circuitry, while Light-ON and Dark-ON operation supports different control requirements. The sensor operates from 12 to 24 VDC, and both sensing units use 2 m pre-wired cables. Total current consumption is specified at 35 mA, while response time is 1 ms maximum. Within the E3Z Series, the E3Z-LT81 2M provides fixed wiring within the PNP laser through-beam sensor range across Omron Industrial Products.
| Brand | Omron |
| Product | Photoelectric Sensors |
| Model Number | E3Z-LT81 2M |
Omron E3Z-LT81 2M Photoelectric Sensor – Technical Specifications
| Specification | Value |
|---|---|
| Sensing Method | Through-beam |
| Sensing Distance | 60 m |
| Emitter Number | E3Z-LT81-L 2M |
| Receiver Number | E3Z-LT81-D 2M |
| Standard Sensing Object | Opaque: 12-mm dia. min. |
| Light Source | Red LD (655 nm), Laser Class 1 |
| Power Supply Voltage | 12 to 24 VDC |
| Output Configuration | PNP |
| Connection Method | Pre-wired 2 M cable |
| Current Consumption | 35 mA (Emitter 15 mA, Receiver 20 mA) |
| Control Output | Load power supply voltage: 26.4 VDC max., Load current: 100 mA max., Open collector output |
| Operation Mode | Light-ON/Dark-ON |
| Response Time | Operate or reset: 1 ms max. |
| Sensitivity Adjustment | One-turn adjuster |
| Indicators | Operation indicator (orange) , Stability indicator (green), Emitter for Through-bream Models has power indicator (orange) only. |
| Ambient Illumination | Incandescent lamp: 3,000 lx max., Sunlight: 10,000 lx max. |
| Ambient Temperature Range | Operating: −10 to 55°C, Storage: −25 to 70°C (with no icing or condensation) |
| Ambient Humidity Range | Operating: 35% to 85%, Storage: 35% to 95% (with no icing or 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, and Reversed output polarity protection |
| Degree Of Protection | IP67 (IEC 60529) |
| Material | PBT (polybutylene terephthalate), Modified polyarylate resin |
| Weight | Approx. 120 g |
The Omron E3Z-LT81 2M Photoelectric Sensor uses laser through-beam sensing across a specified distance of up to 60 m. Its optical arrangement consists of the E3Z-LT81-L emitter and E3Z-LT81-D receiver, with a 655 nm red laser diode establishing the beam between the two units. An opaque target of 12 mm diameter minimum is specified. The PNP output supports connection with compatible industrial control inputs, while load supply voltage is stated up to 26.4 VDC and load current up to 100 mA. The units operate from 12 to 24 VDC and consume 35 mA in total, specified as 15 mA for the emitter and 20 mA for the receiver. Light-ON or Dark-ON operation is available, and response time is specified at 1 ms maximum. Both units use 2 m pre-wired cables.
For an Omron PNP laser through-beam sensor requiring long-range sensing and fixed cable wiring, the relevant model is the E3Z-LT81. A one-turn adjuster supports setup, while operation and stability indicators provide visual status information and the emitter includes a power indicator. Operating temperature is specified from -10 to 55°C, with storage from -25 to 70°C. Reversed power-supply polarity protection, output short-circuit protection, and reversed output polarity protection are included. The 60 m range and PNP output distinguish this configuration from the related NPN arrangement. For a connector-based PNP model using the same stated 60 m range, see E3Z-LT86.
