Omron E3T-SR42 5M Retro-Reflective Photoelectric Sensor
Omron E3T-SR42 5M is an ultrathin retro-reflective photoelectric sensor designed for object sensing across a 30 to 200 mm range. A red LED sends light toward the reflector, while the built-in amplifier processes changes in the returned optical path. The NPN output transfers the switching state to compatible PLC inputs and control circuits, and Dark-ON operation defines the specified logic. The sensor operates from 12 to 24 VDC, consumes up to 20 mA, and includes a 5 m pre-wired cable for extended wiring. Within the E3T Series, the E3T-SR42 5M provides the long-cable Dark-ON option. Related retro-reflective sensors are available across Omron Sensors.
| Brand | Omron |
| Product | Photoelectric Sensors |
| Model Number | E3T-SR42 5M |
Omron E3T-SR42 5M Photoelectric Sensor - Technical Specifications
| Specification | Value |
|---|---|
| Sensing Method | Retro-reflective |
| Shape | Square type |
| Sensing Distance | 30 to 200 mm |
| Power Supply Voltage | 12 to 24 VDC |
| Output Configuration | NPN |
| Connection Method | Pre-wired cable length 5m |
| Current Consumption | 20 mA max |
| Light Source (Wavelength) | Red LED |
| Operation Mode | Dark-ON |
| Response Time | 1 ms max. |
| Degree Of Protection | IP67 |
| Material | Polybutylene terephthalate |
| Material Lens | Denatured Polyarylate |
| Weight | 20g |
The Omron E3T-SR42 5M Photoelectric Sensor uses retro-reflective sensing across a 30 to 200 mm range in an ultrathin square body. A red LED directs light toward a reflector, while the built-in amplifier processes changes in the returned optical path. The NPN output communicates the switching state to compatible PLC inputs and machine-control circuitry, and Dark-ON operation defines the specified output logic. The sensor operates from 12 to 24 VDC and consumes up to 20 mA. Operate or reset time is specified at 1 ms max. A 5 m pre-wired cable provides extended wiring length between the sensing point and control equipment.
For an Omron Dark ON retro reflective sensor requiring NPN output and short-range sensing, the relevant model is the E3T-SR42. Polybutylene terephthalate is listed for the housing and denatured polyarylate for the optical section. IP67 protection is specified, while approximate weight is 20 g. Its configuration also suits searches for an Omron 200 mm retro reflective sensor and Omron long cable NPN sensor. The 1 ms response supports presence sensing and position confirmation in compact automated equipment and repetitive machine cycles. For the related Light-ON NPN version with the same 30 to 200 mm range, see E3T-SR41 5M.
