• Lambda sensor

    Lambda sensor

    Oxygen sensor entirely design for wood heating appliances manufacturersHigh reliability, fast monitoring, excellent water resistance and tightness
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  • Denso Made

    Denso Made

    Made and design in Japan by Denso Corporation for wood heating market.Denso and FKK Corporation strive to revolutionize biomass market.
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  • Retrofit


    A design to retrofit in most of wood pellet stoves, boiler or burner. Flangeless or 3/8" thread, find the design for your system.
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  • 1

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Biomass burner (wood pellet, chips, log, etc) oxygen sensor

Introducing the OSx Oxygen Sensor made for biomass burner, an advance technology to maximises burner performance and solid fuel efficiency while reducing harmful emissions.

The OSx oxygen sensor have been designed by DENSO Corporation in cooperation with FKK Corporation to measure the pro- portion of unburned oxygen in exhaust gases of biomass, especially wood pellet burner systems.

This oxygen sensor with integrated zirconium heater, provide an output signal in the range of lambda and make it capable of being used as universal lambda sensor in every biomass burning appliances.

What role do lambda sensors play?

In order to reduce emissions, modern biomass boiler have been designed to carefully control the amount of solid fuel they burn.

The Lambda (or Oxygen) Sensor is a critical component in this process, its goal is to work together with the boiler’s auger, inlet and exhaust air fan and electronic control unit (ECU) to achieve the lowest possible output of environmentally harmful exhaust gas emissions and biomass fuel consumption whatever the fuel quality.

The Lambda Sensor does this by monitoring the percentage of unburned oxygen present in the burner’s exhaust gases. This data is fed to the boiler’s ECU, which adjusts the A/F (air/solid fuel) mixture. The correct air/solid fuel mixture enables the burner to run efficiently, reducing solid fuel consumption and CO2, NOX, HC emission.


  • Wood pellet stove
  • Wood pellet boiler
  • Wood Pellet burner
  • Wood chips boiler
  • Wood log boiler
  • Other biomass burner and special application
  • Can also be use for the lambda control of gas premix burner

Denso O2 sensor technology benefits

  • Can cut solid fuel (e.g. pellet) annual consumption and emission by 20%
  • Detects a broad range of air-fuel ratio up to 21%
  • Long lasting (non-aging)
  • Built-in heater to run at all exhaust gases temperatures
  • Easy to install and retrofit
  • Impervious to oxidation and corrosion
  • Excellent water resistance and air tightness
  • Comply with RoHS, REACH regulation on Hazardous Substances
  • 100% checked before shipment
  • Made in Japan by Toyota car No.1 supplier

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