Omron E3T-ST32 2M Ultracompact Through-Beam Photoelectric Sensor
Omron E3T-ST32 2M is an ultracompact through-beam photoelectric sensor with a 2 m sensing distance and NPN output. Its red LED establishes the optical beam between the emitter and receiver, while the built-in amplifier processes the change created when a target interrupts that path. Dark-ON operation determines the output behavior, and the response time is specified at 1 ms maximum. The sensor operates from 12 to 24 VDC and includes a 2 m pre-wired cable. Total current consumption is 30 mA maximum, divided between 10 mA maximum for the emitter and 20 mA maximum for the receiver. Within the E3T Series, the E3T-ST32 2M provides the Dark-ON NPN configuration. Related compact NPN through-beam sensors are available across Omron Industrial Sensors.
| Brand | Omron |
| Product | Photoelectric Sensors |
| Model Number | E3T-ST32 2M |
Omron E3T-ST32 2M Photoelectric Sensor - Technical Specifications
| Specification | Value |
|---|---|
| Sensing Method | Through-beam |
| Shape | Square type |
| Sensing Distance | 2m |
| Power Supply Voltage | 12 to 24 VDC |
| Output Configuration | NPN |
| Connection Method | Pre-wired cable length 2m |
| Current Consumption | 30 mA max. (Emitter 10 mA max., Receiver 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 | 40g |
The Omron E3T-ST32 2M Photoelectric Sensor uses through-beam sensing across a 2 m distance in an ultracompact square-type format. A red LED establishes the optical beam between the emitter and receiver, while the built-in amplifier processes the change created when a target interrupts that path. Its NPN output transfers the switching state to compatible control circuitry, and Dark-ON operation defines the specified output logic. The sensor operates from 12 to 24 VDC and includes a 2 m pre-wired cable. Maximum current consumption is 30 mA, consisting of 10 mA maximum for the emitter and 20 mA maximum for the receiver. Response time is specified at 1 ms maximum, supporting rapid switching when target presence changes.
For an Omron 2 m through-beam sensor requiring NPN output with Dark-ON behavior, the relevant model is the E3T-ST32. Its ultrathin M2-mounting format supports restricted machine layouts where larger sensor housings may not fit. The supplied specification lists IP67 protection and identifies PBT and denatured polyarylate as construction materials. This model also aligns with searches for an Omron compact NPN sensor and Omron Dark-ON photoelectric sensor. Separate emitter and receiver elements establish the optical path, so correct alignment is important across the specified working distance. For the corresponding Light-ON model with the same 2 m sensing distance, NPN output, and 2 m pre-wired cable, see the E3T-ST31 2M. Both operate from the same 12 to 24 VDC supply range.
