Pyrometers – Raytek Thermalert 4.0 Series


  • Durable stainless steel IP65 / NEMA4 enclosures
  • Read temperature ranges from -40 °C to 2300 °C (-40 ºF to 4172 °F)
  • Withstands ambient temperatures from -20 °C to 85 °C (-4 °F to 185°F)
  • Intrinsically safe models (ATEX/IECEx/CCC-IS certification)
  • Integrated laser sighting
  • Galvanic isolated outputs
  • Plastic lens option for food applications
  • Analog input for ambient compensation and adjusting emissivity setting
  • Multiple communication interfaces:
    • 2-wire loop powered for analog communication
    • 2-wire loop options specifically for HART protocols
    • 4-wire (Fieldbus Support – Ethernet, EthernetIP, ProfinetIO)
    • 12-wire M16 and 6-pin terminal block for digital communication (RS485)
  • Advanced signal processing
  • Wide choice of focus distances

The Thermalert 4.0 Series Pyrometers from Fluke Process Instruments include numerous integrated infrared temperature sensors with our widest selection of spectral ranges that can be used for a wide variety of process control applications. Each pyrometer conforms to Industry 4.0 standards, combines innovative digital technology with standard two-wire installations for all setups and can be ordered with ATEX and IECEx certification. With multiple communication options, this smart infrared measurement sensor provides the features you need to understand your temperature data and control your unique process in a compact, integrated package that is easy to install and operate.

Thermalert 4.0 Pyrometers

With the ability to withstand ambient temperatures up to 85°C (185°F) without extra cooling, as well as multiple wavelength options to support a broad range of applications, Thermalert 4.0 Series Pyrometers can provide a complete picture of even the harshest environments. Each pyrometer is designed with best-in-class optical resolution, which varies based on the application, and multiple communication options to meet your process requirements – including 2-wire loops powered by RS485, digital outputs (Ethernet, EthernetIP, ProfinetIO) and analog outputs. Laser sighting, ATEX/IECEx certification and a broad range of accessories (including high temperature enclosures) are also available for all models.


Designed for harsh environments, Thermalert 4.0 Series Pyrometers provide accurate, real-time temperature measurements for process control applications spanning metals, plastics, glass, oil and gas, food and more. This robust solution comes in a compact, integrated package that is easy to install and operate, so you can take your process control to the next level.

  • Rugged, smart and easy-to-install
  • Improve process control with wide choice of spectral ranges and focus distances designed specifically for your application
  • Reduce setup time with plug-and-play technology and integrated laser sighting
  • Protect your process and employees with intrinsically safe ATEX/IECEx/CCC-IS certification
  • Choose from options of analogue and digital communication protocols





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