Furnace Exit-Gas Temperature (FEGT) Measurement System

Continuously measure Furnace Exit-Gas Temperature (FEGT) using Non-Contact Infrared Sensors to optimize overall performance of boilers and furnaces under varying conditions of coal quality, load, ash fouling, and slagging.

Furnace Exit-Gas Temperature (FEGT) Measurement System
System Schematic

Key Features

  • Prevent failures by proactively monitoring the furnace temperature
  • Determine precisely when to perform sootblowing
  • Set trigger alarms to take quick corrective actions when gas temperatures approach slagging/fouling limits with continuous online monitoring
  • Measure and quantify trade-offs of heat rate and NOx and SO2 emissions
  • Optimize heat transfer by controlling FEGT under varying conditions
  • Prevent unwanted slag accumulation at inlet pendants by controlling FEGT below ash fusion temperatures
  • Reduce down time due to failures by prevention
  • Easily install and maintain while boiler is online.


In many combustion processes, one of the main combustion gases is CO2. Therefore, measuring the CO2 gas temperature is a reliable measurement of the combustion temperature.

Our combustion monitoring solution is a cost effective system that utilizes the IPE 140/45 pyrometer. This is a pyrometer specifically designed for reliable “non-contact” temperature measurement of hot combustion gas containing CO2.

The system is easy to install and maintain even while the boiler is online. It allows for a very quick reaction to undesirable conditions with continuous online monitoring of the combustion temperature.

LumaSense’s FEGT solution includes:

  • Infrared Temperature Sensor
  • Protective Sealed Jacket Assembly
  • Protective Cooling Jacket
  • Vortex Air Cooler
  • Removable CaF2 Window Assembly (Window Slide)
  • Air Purge Assembly
  • Extended Site Tube
  • Mounting Flange (Ball Flange)
  • Air Filter for Vortex Air Cooler



  The FEGT system can be integrated directly into a plants control system or as part of a more complete solution as shown here. 

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