Omron E3T-ST12 2M Ultracompact Through-Beam Photoelectric Sensor

USD 51.30

Through-beam sensor: 1m range, 12-24VDC input, and NPN Dark-ON open collector output. Features a 650nm visible red LED, 1ms response frequency, and durable PBT housing with IP67 rating.

SKU Omron-E3T-ST12 2M Category
Photoelectric Sensors

Omron E3T-ST12 2M Ultracompact Through-Beam Photoelectric Sensor

Model Identifier E3T-ST12 2M
Official Part Number E3T-ST12 2M
GTIN Standard 4536853289812

Technical Overview

The Omron E3T-ST12 2M is an ultracompact, through-beam photoelectric sensor equipped with a built-in amplifier, engineered for high-precision detection in highly space-constrained industrial environments. It utilizes Omron's 'Hyper LED' technology to emit a pinpoint visible red light (650 nm), ensuring accurate detection of extremely small objects down to a 2 mm diameter. Delivering a 1-meter sensing distance, this sensor features a Dark-ON operation mode with an NPN open-collector output. Its robust IP67-rated enclosure and high ambient light immunity make it highly dependable for harsh and well-lit environments, while the fast 1 ms response time supports rapid manufacturing and assembly processes. It comes pre-wired with a 2-meter cable for immediate integration.

Key Features

  • Through-beamsensingmethodcapableofa1-metermaximumsensingdistance[1.2].
  • Ultracompact, thin rectangular profile designed specifically for installation in tight mechanical clearances.
  • Visible red 'Hyper LED' (650 nm) ensuring pinpoint beam focus for detecting miniature objects.
  • NPN open-collector output configuration with Dark-ON operation mode.
  • Pre-wired with a 2-meter cable for simplified electrical routing and integration.
  • High-speed operation with a maximum operate or reset response time of 1 ms.
  • IP67 enclosure rating provides excellent resistance against dust and water ingress.

12 to 24 VDC Supply Voltage with 50 mA Max Output Current

Technical Specification Matrix

ParameterValue
Sensor TypeThrough-Beam Photoelectric
Sensing Distance1 m
Light SourceRed LED (650 nm)
Output TypeNPN Open Collector
Operation ModeDark-ON
Supply Voltage12 to 24 VDC
Current ConsumptionEmitter: 10 mA max., Receiver: 20 mA max.
Output Current50 mA max.
Response Time1 ms max.
IP RatingIP67
Operating Temperature-25°C to 55°C
Connection MethodPre-wired cable, 2 m

Industrial Applications

1. Micro-Component Detection in Electronics Assembly

Utilizing the ultracompact design of the E3T-ST12, this sensor is deployed along high-speed SMT assembly conveyors to detect miniature electronic components such as ICs and surface-mount capacitors before pick-and-place operations.

Problem Solved

Standard sensors are too bulky to fit into the tight confines of modern PCB assembly tracks, and their beams are too wide to reliably detect extremely small, fast-moving parts. The E3T-ST12 solves this by using a pinpoint 650 nm Hyper LED beam capable of detecting objects down to 2 mm at a fast 1 ms response time.

SMT assembly1 ms response timeMicro-component detection650 nm Hyper LEDNPN Open Collector

2. Edge and Film Detection in Packaging Machinery

Deployed within the narrow roller gaps of automated packaging equipment, the through-beam sensor monitors the continuous feed of thin packaging films or webs, triggering safety stops or alignment corrections when the web breaks or shifts.

Problem Solved

Packaging machine rollers offer extremely limited clearance for sensor mounting. The ultrathin profile of the sensor fits effortlessly into these gaps, while its 1-meter sensing distance safely spans across the web, reliably triggering via the Dark-ON NPN output when the opaque film interrupts the beam.

Web edge alignmentThrough-beam sensing1-meter sensing distancePackaging automationDark-ON operation

3. Vial and Syringe Positioning in Medical Automation

Integrated into indexing dial tables used for assembling sterile medical devices, the sensor acts as a precision positioning trigger that ensures clear vials or syringe bodies are correctly seated before filling or capping.

Problem Solved

High-glare environments and bright factory lighting often cause false triggers in standard photoelectric sensors. The E3T-ST12 overcomes this with high ambient light immunity (up to 10,000 lx for sunlight and 5,000 lx for incandescent light) and an IP67 rating that withstands rigorous factory conditions, all within a miniature footprint.

Medical device assemblyAmbient light immunityIP67 enclosureIndexing tablePositioning feedback
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