Overview
The Omron E3Z-R81 is a compact photoelectric sensor designed for retro reflective sensing applications. This sensor features a built-in amplifier that eliminates the influence of installation and on-site conditions, thus increasing the reliability of the line. The E3Z-R81 employs a red LED light source and PNP open collector output, making it suitable for standard industrial control environments requiring robust object detection.
Key Features
- Long Sensing Distance: 4m maximum range for retro reflective models when used with optional reflector (E39-R1S)
- Built-in Amplifier: Integrated signal conditioning reduces external component requirements and installation complexity
- Compact Housing: Square-type design with dimensions of 31 x 10.8 x 20 mm and PBT housing material
- Optical Alignment: Mechanical axis and optical axis offset of less than ±2.5° simplifies optical axis adjustment
- IP67 Protection: Sealed housing rated for washdown and contaminated industrial environments
- Pre-wired Cable: Supplied with 2m connection cable, reducing on-site assembly time
Technical Specifications
- Sensing Mode: Retro reflective (polarized)
- Sensing Range: 100 mm to 4 m maximum
- Supply Voltage: 12 to 24 VDC
- Output Type: PNP open collector, 100 mA maximum
- Light Source: Red LED (660 nm wavelength)
- Operating Temperature: -25 to +55 °C
- Housing Material: Polybutylene Terephthalate (PBT)
- Ingress Protection: IP67
- Connection: Pre-wired cable, 2 m length
Typical Applications
- Packaging machinery — detecting box or bag presence on conveyors
- Material handling — bottle/container detection on high-speed lines
- Machine automation — part positioning and count verification
- Production monitoring — throughput verification and line integrity
- Printing and labeling — web material presence detection
Compatibility & Replacements
Compatible With
- Allen-Bradley CompactLogix and ControlLogix PLC inputs
- Siemens S7-1200, S7-1500 digital inputs (24 VDC)
- Omron CJ-series, NX-series controllers
- Mitsubishi FX and Q-series PLCs
- Standard 12–24 VDC industrial control systems
- PROFINET and EtherNet/IP gateways via analog/digital conversion modules
Replaces / Drop-In Replacement For
- Omron E3Z-R81 series variants (standard cable lengths)
- Banner L-Gage WLS27 (cross-compatibility with mechanical mounting adapter)
- Sick WL27 retro reflective sensor (electrical specifications match; verify mechanical fit)
Works With
- PLC Software: Studio 5000, TIA Portal, Sysmac Studio
- Protocols: Standard PNP 24 VDC digital logic (no special driver required)
- Reflectors: Omron E39-R1S retro reflector recommended for maximum range
- Accessories: Mounting brackets and alignment aids available from Omron (part series E3Z-***)
