Omron E3ZG-R81-S 2M — Photo Sensor, 4 m, PNP
SKU: E3ZG-R81-S 2MUSD 12.00
Omron E3ZG-R81-S 2M E3ZG retro-reflective photo sensor, 100 mm to 4 m, PNP out, pre-wired 2 m. In stock.
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Product Overview
The Omron E3ZG-R81-S 2M is a square-body retro-reflective photoelectric sensor with mirror surface rejection (MSR) from the E3ZG family, manufactured by Omron Corporation. Hengyixin Automation ships this sensor from our Xiamen warehouse with a 30-day DOA return window and a datasheet PDF included in the box.
The sensor detects opaque objects at 100 mm to 4 m with the E39-R1S reflector (3 m with the E39-R1). The minimum object is an opaque disc 75 mm in diameter. The red LED runs at 660 nm. The polarising filter rejects false triggers from shiny surfaces.
Supply is 12 to 24 VDC +/-10%, 30 mA max. Output is PNP open collector at 26.4 VDC and 100 mA max, with Light-ON or Dark-ON selectable. Response is 1 ms. The body is IP67, -25 to +55 degC, with a 2 m pre-wired PVC cable, about 65 g. For a smaller cylindrical retro sensor on PNP, pick the E3Z-R86. For an AC/DC 6 m retro with SPDT relay output, pick the E3JK-RR12-C.
Key Features
- E3ZG square-body retro-reflective photo sensor with MSR polarising filter
- 100 mm to 4 m with E39-R1S reflector (3 m with E39-R1), opaque 75 mm dia. min.
- Red LED 660 nm, 12-24 VDC, 30 mA max, PNP open collector 100 mA
- Light-ON / Dark-ON selectable, 1 ms response, IP67, pre-wired 2 m PVC
- SKU: E3ZG-R81-S 2M
- Series: Omron E3ZG-series square-body retro-reflective photoelectric sensor
- Voltage: 12 TO 24 VDC
Best-Fit Applications
- Carton detection on a sortation conveyor where the 4 m range covers the belt width and the MSR polarising filter rejects the shiny carton tape
- Pallet presence check at a stretch-wrapper infeed where the red 660 nm beam is visible through a viewing port for alignment
- Spare drop-in for an existing E3ZG panel where the E39-R1S reflector is already mounted on the opposite side
Buying Checklist
- Pick the E3ZG-R81-S 2M for a square-body retro-reflective sensor with MSR, 4 m range, PNP output and pre-wired 2 m cable.
- Pick the E3Z-R81 instead when the cabinet needs a smaller cylindrical retro sensor on the same 4 m PNP body.
- Pick the E3JK-RR12-C instead when the cabinet needs 24-240 VAC/DC supply with an SPDT relay output.
Technical Specifications
| Manufacturer | Omron Corporation (Japan) |
|---|---|
| Series | Omron E3ZG-series square-body retro-reflective photoelectric sensor |
| Model / SKU | E3ZG-R81-S 2M |
| Sensing Method | Retro-reflective with MSR (mirror surface rejection polarising filter) |
| Sensing Distance | 100 mm to 4 m with E39-R1S; 100 mm to 3 m with E39-R1 |
| Standard Object | Opaque, 75 mm dia. min. |
| Light Source | Red LED, 660 nm |
| Supply Voltage | 12 to 24 VDC +/-10%, ripple 10% max |
| Current Consumption | 30 mA max |
| Control Output | PNP open collector, 26.4 VDC max, 100 mA max |
| Operation Mode | Light-ON / Dark-ON selectable |
| Response Time / Protection | 1 ms max; IP67; -25 to +55 degC; 2 m pre-wired PVC; 65 g |
FAQ for E3ZG-R81-S 2M
What is the MSR function on the E3ZG-R81-S?
MSR (mirror surface rejection) is a polarising filter on the receiver. The red beam is polarised, and the receiver only accepts light returning with the same polarisation. Reflective surfaces like foil, shiny tape or polished metal bounce the light back without depolarising it, so the sensor ignores them. Only the E39-R1 / E39-R1S reflector depolarises the beam and triggers the sensor.
What reflector pairs with the E3ZG-R81-S 2M?
The E39-R1 (round 60 mm reflector) for the 3 m range or the E39-R1S (square 60 mm reflector) for the 4 m range. Mount the reflector perpendicular to the sensor beam and within the rated distance.
Is the E3ZG-R81-S PNP or NPN?
PNP (sourcing). The R8x designation in the E3ZG family means PNP; the R6x designation is NPN. The output switches to +V when the beam is broken in Dark-ON mode. Connect the brown wire to +V, the blue wire to 0 V, and the black wire to the PLC input.
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