Omron E3Z-LR81 — Laser Retro Sensor, PNP, 15 m, 2 m
SKU: E3Z-LR81USD 103.00
E3Z-LR compact laser retro-reflective sensor with MSR, 15 m range with E39-R1, PNP open collector, pre-wired 2 m cable, IP67.
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Product Overview
The Omron E3Z-LR81 is a compact laser retro-reflective photoelectric sensor from the E3Z-LR family, designed to detect objects that defeat a standard retro sensor — shiny foil labels, polished metal cans, glossy cartons, and small surface-mount components. It uses a Class 1 visible red laser (660 nm), paired with a polarising MSR (Mirror-Surface Rejection) filter that ignores the specular reflection from a flat shiny surface and only registers the diffuse return from a reflector placed directly behind the target.
Picking the right code
E3Z-LR is the laser retro family. The third digit picks the output and connector: 1 is PNP open-collector with a pre-wired 2 m cable, 6 is PNP with an M8 4-pin connector, 8 is NPN with an M8 4-pin connector. NPN pre-wired is the E3Z-LR11 2M. Reach 15 m with the standard E39-R1 reflector at a 5 mm spot, or use the E39-R2 / E39-R6 for a 200 mm spot and 7 m range — useful when the target path is small and a wider beam avoids aiming errors.
Before ordering
Power the sensor from a 12-24 VDC ±10 % supply. Set Light-ON / Dark-ON on the rear switch; for shiny-foil detection on a conveyor, Dark-ON usually works better because the polarising filter rejects the direct mirror return. Verify the M.S.R. reflector side faces the sensor (the opposite side from a normal reflector mark). For transparent bottles, switch to E3Z-B61 2M; for a clear-PET line, plain retro reflex cannot tell PET from air.
Key Features
- E3Z-LR compact laser retro-reflective photoelectric sensor
- Polarising M.S.R. (Mirror-Surface Rejection) for shiny / metal targets
- Class 1 visible red laser, 660 nm
- Sensing range 15 m with E39-R1 reflector (5 mm spot at 3 m)
- 7 m range and 200 mm spot with E39-R2 / E39-R6 reflector
- PNP open-collector output, 100 mA max load
- Light-ON / Dark-ON selectable on the rear switch
- Pre-wired 2 m oil-resistant PVC cable
- 12-24 VDC ±10 % supply, 30 mA current draw
- 1 ms response time
- IP67 PBT housing, -25 to 55 °C operating temperature
- SKU: E3Z-LR81
- Series: E3Z-LR compact laser retro-reflective sensor
- Voltage: 12-24 VDC
- I/O: 100 I/O
Best-Fit Applications
- Detect blister packs and foil-wrapped pharma cartons on a conveyor
- Trigger on polished metal cans or magnetic components leaving a wash station
- Pick-and-place verification on a glossy PCB panel before reflow
- Count glossy ceramic or glass-fronted appliances on an end-of-line conveyor
- Position check on a small shiny part where a wide 200 mm beam avoids alignment drift
Buying Checklist
- Pick E3Z-LR86 with an M8 connector instead if you prefer a quick-disconnect flying lead.
- Pick E3Z-LR61 with an M8 connector instead if your PLC expects NPN inputs.
- Pick E3Z-R61 2M non-laser polarised retro instead if a 4 m LED retro works on your labels.
- Pick E3Z-B61 2M clear-PET retro if your line runs clear plastic bottles.
- Pick E3Z-LL86 if you need BGS laser distance sensing instead of through-beam-style detection.
- Order at least one E39-R1 reflector (sold separately) — the sensor alone does not include the reflector.
Technical Specifications
| Series | E3Z-LR compact laser retro-reflective sensor |
|---|---|
| Sensing Principle | Retro-reflective with M.S.R. polarising filter |
| Light Source | Class 1 red laser, 660 nm |
| Sensing Range | 15 m with E39-R1 reflector; 7 m with E39-R2 / E39-R6 |
| Output | PNP open-collector, 100 mA max at 26.4 VDC |
| Operating Modes | Light-ON / Dark-ON selectable |
| Connection | Pre-wired 2 m PVC cable |
| Supply Voltage | 12-24 VDC ±10 %, 30 mA max |
| Response Time | 1 ms |
| Protection | IP67 PBT housing |
| Operating Temperature | -25 to 55 °C |
Resources & Downloads
FAQ for E3Z-LR81
What is the actual sensing range, and what does 350 mm in the old listing mean?
The official range is 15 m with the standard E39-R1 reflector. Older stock listings quoting "350 mm" were confusing this SKU with the short-range diffuse E3Z-D8x series; the E3Z-LR81 has always been a long-range retro sensor. Use the E39-R1 reflector (5 mm spot at 3 m) for accurate aiming, or step up to the E39-R2 / E39-R6 reflector (200 mm spot) if the target is small or the alignment drifts.
Can the E3Z-LR81 see through a clear PET bottle?
No. The polarising M.S.R. filter rejects the double-refraction return from a transparent object, so a clear PET or clear glass bottle will not register reliably. For clear-bottle detection on a filling line, choose the E3Z-B61 2M clear-PET retro-reflective sensor.
Is the E3Z-LR81 a Class 1 or Class 2 laser product?
It is a Class 1 laser product, the safest classification — no laser safety eyewear or protective enclosure is required under normal use. Eye-safe even through optics within the beam for short-duration exposure.
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