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MI3 Series

Raytek MI3 - World's Smallest Standalone Sensor

Raytek Mi3
Typical uses include
  • Industrial OEM installations
  • Printing, paper, converting, textiles, sealing, bending, drying and curing
  • Asphalt & construction materials
  • Plastics processing; extrusion, thermoforming, molding, welding and sealing
  • Ovens & dryers
  • Food processing and pharmaceuticals
  • Machine condition monitoring and maintenance
  • Electrical busbar and switchgear monitoring
Versatile, high-performance IR thermometers offer lowest installed cost per measurement point

The new Raytek® MI3 infrared sensors offer industry-leading performance at the lowest installed cost per measurement point for a broad range of OEM and industrial manufacturing processes.

This new generation of infrared thermometers delivers innovative new features with pricing that will save you time and money.


  • Sensing head as stand
  • Alone pyrometer (no box required)
  • Plug & Play (automatic head detection)
  • Self diagnostic functions (break of a head wire)
  • DIN rail mountable box
  • Innovative feature set for OEM & industrial applications
  • One box for all MI3 sensing head models for error-free installations
  • Wide temperature range from -40°C to 1650°C  (-40°F to 3002 °F)
  • Fast 20 mSec response time (LTF model)
  • Intuitive user interface with high resolution LCD
  • Precision high resolution optics up to 22:1
  • Rugged IP 65 (NEMA-4) stainless steel sensing head
  • Standard USB 2.0 digital interface for  fast, easy remote set-up

Product Description
The Raytek MI3 infrared temperature sensors represent a new generation of performance and innovation in continuous noncontact temperature monitoring for a broad range of OEM applications and manufacturing processes. 

The MI3 infrared pyrometer is a two-piece system with a miniature sensing head and separate communications electronics. The miniature sensing head can be installed in any system and outperforms much larger sensors, making the Raytek MI3 the best valued IR temperature sensor in its class. 

The OEMMI3 version allows direct digital communication with the host machine controller without the need for an additional communication box.

The innovative multiple sensing head interface, which can support up to 8 individually addressable heads per communication box, reduces sensor cost, simplifies sensor installation and applications troubleshooting, and provides the lowest cost per measurement point. 

The MI3 is also available in a convenient DIN-rail mountable package with USB and RS485 digital communications.

Choose one of the following models, depending on your application needs and target temperature range:



Optical Resolution

System Response Time


-40°C to 600 °C
(-40°F to 1112°F)

2:1, 10:1, 22:1

130ms (90%)


0°C to 1000 °C
(32°F to 1832°F)


20ms (90%)


250°C to 1650 °C
(482°F to 3002 °F)


55ms (90%)



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