A/F oxygen sensor

Oxygen sensor and controller for optimization of combustion equipments

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Widebande oxygen sensor for combustion equipments

Wide band oxygen sensor

Detects a wide range of air-fuel ratios (up to 25% oxygen) in exhaust gas and output a linear signal.

Drawing

All in one solution

OSx-2 sensor is provided as a set of A/F sensor + 3m or 6m extension cable + a controller module.

Data-sheet

Wide band oxygen sensor for gas burner and boiler

Calibration & other functions

The smart controller can perform auto-calibration, heater control, auto-diagnostic, error notification functions/p>

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What is the role of A/F sensor?

Air/Fuel (A/F) sensor or wideband oxygen sensor, is an advanced type of oxygen sensor that provides accurate and detailed information about the air-to-fuel ratio (A/F) in the exhaust gases of a burner or boiler. It is a critical component for modern combustion systems, particularly those with performance or efficiency optimization goals.

Applications

Natural gas

Small to large burners
Small to large boilers
Commercial furnace

Hydrogen, other

H2 direct combustion equipments
Laboratory equipment
Other specific equipments

Difference between lambda sensor and A/F sensor

The output of the lambda O2 sensor changes abruptly after stoichiometry (complete combustion), whereas the output of the A/F sensor changes smoothly from stoichiometry to atmosphere. Since the output is almost linear with respect to the air-fuel ratio, it is relatively easy to control the output to be close to the ideal air-fuel ratio (λ=1).

Therefore, it can realize more precise adjustment of the gas/air mixture ratio in burners and boilers, contributing to reductions in emissions of environmentally hazardous substances such as HC, CO, and NOx.

Beside A/F sensors operate on the principle of the Nernst voltage and are equipped with an additional pump cell compare to lambda sensor. This pump cell actively moves oxygen ions through the sensor, allowing it to maintain a precise A/F ratio measurement even under varying conditions and independantly of ambient temperature.

A/F oxygen sensor for optimization of natural gas and hydrogen burner

By precisely monitoring exhaust gas oxygen ratio, A/F sensor allows a significant reduction of emission, improve efficiency and redundant safety function.

Linear

Wide band signal

2 in 1

sensor + controller

20%

Energy saving

A/F oxygen sensor for optimization of natural gas and hydrogen burner

Wide band oxygen sensor technology benefits

Wide band

Detects a wide range of air-fuel ratios (up to 25% oxygen) in exhaust gas
Life time

Long rating life
Signal output

4 to 20mA linear output similar to conventional oxygen analyzers
Integrated functions

Auto-calibration, heater control, auto-diagnostic, error notification functions
Robustness

Resistant to oxidation and corrosion
Certification

Compliant with CE, UL, RoHS and REACH standards
Cost performance

Relatively cheap compare to conventional oxygen analyzers