TF21

Apparatus for measuring oxygen concentration in air or gas, namely, zirconia exhaust gas oxygen sensors, fast light-off oxygen sensors, ultra fast light-off oxygen sensors, thick film type oxygen sensors and oxygen sensors for CNG engine; apparatus for measuring oxygen concentration and controlling the air/fuel ratio in the exhaust gas from internal combustion engines, boilers, incinerators, gas turbines, generators and fuel cells, namely, universal air/fuel heated exhaust gas oxygen sensors