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Omron E3T-SR42 2M Photoelectric Sensor
The Omron E3T-SR42 2M Photoelectric Sensor is an ultracompact photoelectric sensor with built-in amplifier, retro-reflective type, offering 200 mm sensing distance (using the E39-R4 reflector) and NPN output for precise detection. It operates on a 12β24 VDC power supply and belongs to the Omron automation range under the Omron Photoelectric Sensors category and the Omron E3T Series. Designed for opaque objects of 27 mm dia. min., it uses a red LED (650 nm) light source, features Dark-ON mode, 1 ms response time, 20 mA current consumption, and a 2 m pre-wired cable. Built to IP67 protection standards, it supports up to 50 mA load current ensuring stable, high-speed performance in demanding industrial applications.
| Brand | Omron |
| Product Type | Photoelectric Sensor |
| Model Number | E3T-SR42 2M |
Omron E3T-SR42 2M Photoelectric Sensor β Technical Specifications
| Specification | Value |
|---|---|
| Sensing Method | Retroreflective |
| Sensing Distance | 200 mm [30 mm] |
| Standard Sensing Object | Opaque, 27-mm dia. min. |
| Light Source | Red LED (650 nm) |
| Power Supply Voltage | 12 to 24 VDC , ripple (p-p) 10% max. |
| Output configuration | NPN |
| Connection Method | Pre-wired 2 M cable |
| Current Consumption | 20 mA max. |
| Control Output | Load power supply voltage: 26.4 VDC max. Load current: 50 mA max. (residual voltage: 2 V max. for load current of 10 to 50 mA, 1 V max. for load current of less than 10 mA) Open-collector output |
| Operation Mode | Dark-ON |
| Response Time | Operate or reset: 1 ms max. |
| Indicators | Operation indicator (orange), Stability indicator (green) |
| Ambient Illumination | Incandescent lamp: 5,000 lx max., Sunlight: 10,000 lx max. |
| Ambient Temperature Range | Operating: β25 to 55Β°C Storage: β40 to 70Β°C (with no icing or condensation) |
| Ambient Humidity Range | Operating: 35% to 85% Storage: 35% to 95% (with no condensation) |
| Insulation Resistance | 20 MΞ© min. at 500 VDC |
| Dielectric Strength | AC1,000V, 50/60 Hz for 1 min. |
| Vibration Resistance | 10 to 2,000 Hz, 1.5-mm double amplitude or 300 m/s2 for 0.5 hours each in X, Y, and Z directions |
| Shock Resistance | 1,000m/s2 3 times each in X, Y, and Z directions |
| Protection Circuits | Power supply and control output reverse polarity protection, Output short-circuit protection, Mutual interference prevention |
| Degree of Protection | IEC 60529 IP67 |
| Material | PBT (polybutylene terephthalate), Denatured polyarylate, Methacrylc resin |
The Omron E3T-SR42 2M uses a retroreflective sensing method with a sensing distance of 200 mm when paired with a reflective target and 30 mm for opaque objects of at least 27 mm in diameter. It operates on a 12 to 24 VDC power supply and features a red LED light source (650 nm). With an NPN open-collector output and Dark-ON operation mode, this sensor delivers rapid detection speeds of up to 1 ms, enabling it to handle high-speed production lines with precision.
Its low current consumption of 20 mA makes it ideal for energy-efficient systems, while orange operation and green stability indicators allow for quick status checks during operation. The 2-meter pre-wired cable provides quick installation without the need for complex wiring, and built-in safety features such as reverse polarity protection and short-circuit protection safeguard against electrical faults.
Constructed from durable PBT, denatured polyarylate, and methacrylic resin, the Omron E3T-SR42 2M Photoelectric Sensor is rated IP67 according to IEC 60529, offering resistance against dust, water, vibration (up to 2,000 Hz), and shock (up to 1,000 m/sΒ²). With a compact design and stable retro-reflective performance, itβs trusted for reliable sensing in tight automation setups.
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