Design of a Titanium dioxide lambda sensor

The ceramic sensor element of this lambda sensor is constructed from a ceramic metal oxide - titanium dioxide (TiO2).
Design of a Titanium dioxide lambda sensor

Titanium dioxide element

The ceramic sensor element of this lambda sensor is constructed from a ceramic metal oxide - titanium dioxide (TiO2). The electrodes and heater are printed onto an aluminium oxide substrate and titanium dioxide is deposited on top of the electrodes.

Protection tube

The protective metal tube is designed to allow good gas contact with the element whilst protecting the sensor element from solid particles in the exhaust. Importantly it also protects the element from contact with any water which may be present in the exhaust system. Water vapour, a product of the combustion process, may condense in the exhaust pipe and if contact with the hot ceramic element occurs damage can result due to thermal shock (rapid change in temperature).

Heater

In order for the lambda sensor to reach and maintain its ideal operating temperature of 700 °C as quickly as possible, titanium dioxide lambda sensors are permanently heated.

Gasket

The compressible gasket ensures a gas tight seal between the lambda sensor and exhaust system.

Ceramic holder

The ceramic holder ensures that the sensor element is located securely and protects it from vibrations.

Carrier substrate

The carrier substrate of this lambda sensor is made using multi-layer, thick-film technology from a ceramic material which only serves as the actual carrier for the heater and the element.

Glass seal

The glass seal holds the element in its ceramic holder and secures the attached cable.

Hexagon

The hexagon is the contact point used by the appropriate tools to screw the sensor into the exhaust system. When this is carried out attention should be paid to the application of the appropriate tightening torque.

Sensor earth

This cable establishes the earth connection with the vehicle’s electrical system.

Sensor signal

Through this line the sensor signal is led to the engine control unit.

Seal

A special rubber sealing grommet is fitted between the wiring cables and the top of the sensor’s metal housing in order to prevent water ingress into the interior of the sensor. This rubber seal is crimped into the top of the sensor housing.