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E3T-ST21 2M

Omron E3T-ST21 2M Through-Beam Photoelectric Sensor 300mm NPN

SKU: E3T-ST21 2M

Omron E3T-ST21 2M is a compact through-beam photoelectric sensor with 2 m cable, designed for precise object detection at short range in compact machinery and assembly equipment.

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Product Overview

The E3T-ST21 2M is suited for machine sections where stable short-range object detection is needed in limited installation space. Through-beam sensing improves reliability for part presence checks and timing triggers. Its 2m cable version offers flexible wiring options in compact panels and custom harness layouts, making it practical for OEM builds and retrofit maintenance alike.

  • SKU: E3T-ST21 2M
  • Series: E3T-ST21

Best-Fit Applications

  • Detecting part passage in compact conveyors
  • Confirming component presence before actuation
  • Triggering sequence steps in assembly fixtures
  • Monitoring small object flow in packaging modules
  • Replacing old short-range sensors during maintenance
  • Standardizing compact through-beam sensing in OEM designs

Buying Checklist

  • Through-beam design improves short-range detection consistency
  • 2m cable supports flexible machine wiring
  • Compact footprint fits constrained installation points
  • Reliable for repetitive detection in fast cycles
  • Practical and maintainable for long-term machine service

Technical Specifications

Model E3T-ST21 2M
Product type Photoelectric sensor
Sensing method Through-beam
Range class 300mm short-range
Output type NPN
Cable length 2m
Primary role Part presence and timing detection
Application scope Compact packaging and assembly stations
Integration value Stable trigger signal to PLC inputs
Maintenance value Easy replacement in cable-based sensor setups

FAQ for E3T-ST21 2M

Where is E3T-ST21 2M typically used?
It is typically used in compact automation sections requiring reliable short-range object detection and timing signals.
Why choose through-beam over diffuse sensing here?
Through-beam generally provides stronger detection reliability and reduced sensitivity to target reflectivity variation.
Is the 2m cable version useful for retrofits?
Yes. Cable versions often simplify routing and replacement in existing machine harness layouts.

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