Part of the Omron Photoelectric Sensors series — see the full model table, lifecycle status and replacement parts.
Omron E3T-ST12 2M — 1 m Through-Beam Sensor, Side View, NPN
SKU: E3T-ST12 2MUSD 25.00
Omron E3T-ST12 2M ultra-compact side-view through-beam sensor, 1 m range, NPN Dark-ON, red LED, 2 m cable, IP67 PBT body.
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Product Overview
The Omron E3T-ST12 2M is an ultra-compact side-view through-beam photoelectric sensor with a 1 m sensing range, manufactured by Omron Corporation. Hengyixin Automation ships this sensor from our Xiamen warehouse with a 30-day DOA return window and a datasheet PDF included in the box.
The set is one emitter head and one receiver head, each 18.5 x 7 x 9.5 mm in a black PBT case. The visible red 650 nm LED makes alignment easy. Output is NPN open collector, Dark-ON; it switches ON when the beam is broken. Power is 12 to 24 VDC; the load can pull up to 50 mA. Response time is 1 ms max. The cable is 2 m pre-wired.
Use the E39-L117 bracket for rear mounting or the E39-L118 bracket for side mounting. Minimum sensing object is a 2 mm opaque part. For the Light-ON twin, pick the E3T-ST11. For a diffuse-reflective 30 mm sensor in the same body, pick the E3T-FD11.
Key Features
- Ultra-compact side-view through-beam photoelectric sensor, 1 m sensing range
- NPN open collector, Dark-ON, 12 to 24 VDC supply, 1 ms response
- Visible red 650 nm LED for easy alignment, 2 mm opaque min object
- PBT body, IP67, 2 m pre-wired cable, M2 screws with E39-L117 / L118 brackets
- SKU: E3T-ST12 2M
- Series: Omron E3T miniature photoelectric sensor
- Voltage: 12 TO 24 VDC
Best-Fit Applications
- Detecting ICs dropping off a tape feeder on a pick-and-place head where the 7 mm width fits between the guide rails
- Sensing a thin packaging web between two rollers on a vertical form-fill-seal machine, with the side-view body flat against the frame
- Position check on a syringe dial table where the visible red beam makes it easy to confirm the head is aimed at the target
Buying Checklist
- Pick the E3T-ST12 2M for an ultra-compact side-view through-beam sensor with NPN Dark-ON output and 2 m cable.
- Pick the E3T-ST11 2M instead when the PLC input expects the Light-ON logic of the same sensor.
- Pick the E3T-FD11 instead when you need diffuse-reflective 30 mm sensing in the same miniature body.
Technical Specifications
| Manufacturer | Omron Corporation (Japan) |
|---|---|
| Series | Omron E3T miniature photoelectric sensor |
| Model / SKU | E3T-ST12 2M |
| Sensing Method | Through-beam, side view |
| Sensing Distance | 1000 mm (1 m) |
| Min Sensing Object | 2 mm opaque |
| Light Source | Visible red LED, 650 nm |
| Output Type | NPN open collector, Dark-ON |
| Supply Voltage | 12 to 24 VDC ±10%, ripple 10% p-p max |
| Load Current | 50 mA max |
| Response Time | 1 ms max operate or reset |
| Housing / IP / Cable | PBT; IP67; 2 m pre-wired |
FAQ for E3T-ST12 2M
What does the Omron E3T-ST12 2M detect?
Anything opaque that breaks the 1 m beam between the emitter and receiver heads. The minimum sensing object is 2 mm. Output is Dark-ON, so it switches ON when the beam is interrupted.
E3T-ST12 2M vs E3T-ST11 2M — what is the difference?
Output logic. Both are 1 m side-view through-beam sensors in the E3T series. The ST12 is Dark-ON (output ON when the beam is broken); the ST11 is Light-ON (output ON when the beam is received).
What brackets fit the E3T-ST12 2M?
The E39-L117 rear-mount bracket and the E39-L118 side-mount bracket. Both are sold separately and hold the head with M2 screws.
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