Omron E3Z-R61 2M — Retro-Reflective 4 m NPN, Pre-Wired 2 m
SKU: E3Z-R61 2MUSD 22.00
Compact retro-reflective photoelectric sensor with polarized MSR (mirror-surface rejection), 100 mm to 4 m range with E39-R1S reflector, red LED 660 nm visible spot, NPN open-collector output, pre-wired 2 m oil-resistant PVC cable, IP67, Dark-ON/Light-ON selectable.
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Product Overview
The E3Z-R61 2M is Omron's compact retro-reflective photoelectric sensor in the E3Z family, designed for detecting opaque objects at ranges up to 4 m without the wiring complexity of a separate emitter + receiver pair. The sensor emits a red LED (660 nm) beam toward a reflector (sold separately, typically the E39-R1S), and detects when an object passes between the sensor and the reflector, breaking the beam.
Retro-reflective vs diffuse-reflective vs through-beam
The three main photoelectric sensing modes each have their niche: - Diffuse-reflective (E3Z-D61, E3Z-D62, E3Z-D81, E3Z-D82) — sensor detects light scattered back from the target itself. Range 100 mm to 1 m. No reflector needed. Range depends on target colour; black / matte targets reduce range significantly. Right pick for short-range proximity sensing. - Retro-reflective (E3Z-R61 2M, E3Z-R81, E3Z-R66, E3Z-R86) — sensor and reflector on opposite sides of the detection zone; sensor detects light returning from the reflector. Range up to 4 m. Range is independent of target colour (as long as the target is opaque).
MSR (Mirror Surface Rejection) polarization filter
The E3Z-R61 2M includes a built-in polarization filter that rejects light reflected from shiny surfaces (foil, glass, polished metal, mirror-finish aluminum). Without the filter, the sensor's red LED light would reflect off a shiny surface and return to the receiver just like the reflector — causing a false trigger. The polarization filter ensures that only the light reflected from the dedicated reflector (which depolarizes the light via its retroreflective corner-cube geometry) passes through to the receiver. This allows the E3Z-R61 2M to reliably detect shiny objects (aluminum cans, foil-wrapped packages, glossy cardboard boxes) without false triggers from their reflections.
Reflector selection and alignment
The E3Z-R61 2M requires a reflector, sold separately. For the maximum 4 m range, use the E39-R1S (60 × 40 mm compact reflector) — the standard pick for most applications. For 3 m range, use the E39-R1 (60 × 40 mm without polarization rejection). For longer range on small targets, use the E39-R7 (80 × 80 mm large reflector) for stability. For transparent-object detection (clear glass, clear PET), use the E39-R8 (special reflector with smaller cube geometry). The minimum sensor-to-reflector distance is 100 mm — closer than this, the direct LED reflection from the reflector saturates the receiver.
Key Features
- Compact retro-reflective photoelectric sensor in 20 × 11 × 31 mm cuboid housing
- Sensing distance: 100 mm to 4 m with E39-R1S reflector
- Sensing distance: 100 mm to 3 m with E39-R1 reflector
- Light source: Red LED — visible red spot for easy alignment
- MSR polarization filter — rejects false triggers from shiny surfaces
- Response time: 1 ms max
- Output: NPN open-collector, 100 mA max load current
- Dark-ON / Light-ON mode selectable via white wire
- SKU: E3Z-R61 2M
- Series: E3Z Compact Photoelectric Sensor with Built-in Amplifier
- Voltage: 12 TO 24 VDC
- I/O: 100 I/O
Best-Fit Applications
- Package detection on a wide conveyor belt — the E3Z-R61 2M and reflector are mounted on opposite sides of the.
- Bottle counting on a bottling line — the E3Z-R61 2M detects each bottle as it passes through the beam, with.
- Pallet presence detection at an AS/RS pick station — the E3Z-R61 2M detects when a pallet is in position at.
- Vehicle detection at a parking barrier / gate — the E3Z-R61 2M detects when a vehicle arrives at the barrier.
Buying Checklist
- Pick E3Z-R61 2M for 4 m retro-reflective, NPN, pre-wired 2 m — medium-range conveyor detection with MSR polarization
- Pick E3Z-R81 for 4 m retro-reflective PNP, pre-wired 2 m — same range as R61 but PNP output for European wiring standard
- Pick E3Z-R66 for 4 m retro-reflective NPN with M8 connector — quick-disconnect for modular tooling
- Pick E3Z-R86 for 4 m retro-reflective PNP with M8 connector — PNP + M8 connector
- Pick E3Z-D61 for 100 mm diffuse-reflective NPN — short-range without reflector, target must be in 100 mm range
- Pick E3Z-D62 for 1 m diffuse-reflective NPN — medium-range without reflector
Technical Specifications
| Model | E3Z-R61 2M |
|---|---|
| Series | E3Z Compact Photoelectric Sensor with Built-in Amplifier |
| Type | Retro-reflective with MSR (mirror-surface rejection), 4 m range, NPN, pre-wired |
| Sensing Method | Retro-reflective (sensor + reflector; target breaks the beam) |
| Sensing Distance (with E39-R1S reflector) | 100 mm to 4 m |
| Sensing Distance (with E39-R1 reflector) | 100 mm to 3 m |
| Light Source | Red LED (660 nm), 4-element; visible spot for alignment |
| MSR Function | Yes (built-in polarization filter rejects false triggers from shiny surfaces) |
| Output Type | NPN open-collector, 100 mA max load current |
| Output Operation Mode | Dark-ON / Light-ON selectable (via white wire connection) |
| Supply Voltage | 12 to 24 VDC ±10% (ripple 10% p-p max) |
| Current Consumption | 30 mA max |
| Operating Temperature | -25 to +55 °C |
| Storage Temperature | -40 to +70 °C |
| Mounting | 2 × M3 screws on housing flanges, or 1 × M3 through-bolt; optional E39-L40 L-bracket |
Resources & Downloads
FAQ for E3Z-R61 2M
What's the difference between E3Z-R61 2M and E3Z-D61?
Both are compact NPN-output photoelectric sensors in the E3Z family with the same 20 × 11 × 31 mm cuboid housing. The difference is the sensing mode and range: E3Z-D61 is diffuse-reflective with 100 mm range (no reflector needed, sensor detects light scattered back from the target), E3Z-R61 2M is retro-reflective with 4 m range (requires a reflector, sensor detects when the beam is broken by the target).
What reflector do I need for the E3Z-R61 2M?
The E3Z-R61 2M requires a reflector, sold separately. The standard pick for the full 4 m range is the E39-R1S (60 × 40 mm compact reflector with polarization retention) — the recommended choice for most applications. For 3 m range, use the E39-R1 (60 × 40 mm without polarization retention). For longer range with better stability on small targets, use the E39-R7 (80 × 80 mm large reflector).
How does the MSR (Mirror Surface Rejection) function work on the E3Z-R61 2M?
The MSR function uses a polarization filter on the receiver that only passes light with a specific polarization orientation. The sensor's red LED emits randomly-polarized light. When the light reflects off a retroreflective reflector (like the E39-R1S), the corner-cube geometry of the reflector depolarizes the light, rotating the polarization by 90° — so the light returning from the reflector has the opposite polarization to the original. The MSR filter passes this depolarized light through to the receiver.
Can the E3Z-R61 2M detect clear glass or PET bottles?
The E3Z-R61 2M with the standard E39-R1S reflector can detect clear glass and PET bottles, but the sensing distance is significantly reduced (typically to 1-2 m instead of 4 m, because clear materials only partially block the beam). For reliable transparent-object detection at the full 4 m range, use the E3S-DBN21 (already done in our catalog) — a specialized retro-reflective sensor with P-opaquing algorithm and a smaller reflector (E39-R8) optimized for transparent materials.
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