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   Category: our product range >> Combustion Analysers >> Combustion Check & Flue Gas Analyser - Code : SOX3
Combustion Check & Flue Gas Analyser - Code : SOX3

Quickly  check combustion equipment against manufacturer specs.  Include the parameters you need without the costly extras. The SOX3 Combustion Check meter does measurements and calculations  for (% O2 and flue temperature, % CO2, and % EA for oil, natural gas and propane).  Plus it calculates combustion efficiency, has an automatic electric pump, has a custom fuel input to work on any non-conventional heater. This economical Flue Gas Analyser is a must for all heat technicians in the service field. The Key feature is the replaceable sensor Code: RS02. The meter will indicate when this is due, eliminating frustrating errors due to poor sensor function.


  • User replaceable Smart sensor -SOX3 indicates user when to change
  • Measures %OČ and stack temperature
  • Calculates %COČ and %Excess air (%EA)
  • Display %OČ, %COČ, or %EA and temperature
  • Choose from  four display modes: H - Hold, MAX, MIN or Realtime
  • Fuel types measured: Natural Gas, Oil #2 and Propane
  • Auto Power Off & Back Light  


COČ  - Carbon Dioxide

  • Range: 0 to 25%
  • Accuracy: 0 to 25%  +/-0.3% (calculated)
  • Resolution: 0.1% COČ

OČ  - Oxygen

  • Range: 0 to 25% OČ
  • Overload 30% OČ
  • Accuracy:  0 to 25% +/-0.3% @ 22.2 °C 20.9 % OČ ambient
  • Resolution: 0.1% OČ


  • Range: -50°C to 538°C
  • Accuracy: +/-0.6% + 1.7°C after field calibration
  • Resolution: 0.1° C

What's Included

  • Combustion Check  - SOX3
  • Barrel and Thermocouple Handle - RSOX3
  • Threaded Barrel Lock - RCONE1
  • Filter accessory kit - RAOX9
  • Padded, Blow-molded Case

Warranty two [2] years on meter - We do not warrant Sensors due to nature of use.