Application example: Exhaust gas and temperature sensors
To fulfill modern automotive engine management and exhaust treatment requirements, increasing numbers of sensors are being implemented in exhaust gas systems and near the engine. The requirements are manifold:
• Resistance to temperatures beyond 250°C and even up to 1000°C (1800°F) in some sensor applications and reliability for several thousand temperature cycles
• Resistance to corrosive chemical influences, such as petrol or diesel fuels, exhaust gases, and AdBlue
• Limited space means the sensors need to be as small as possible
Conventional ceramic-based multi-component solutions that protect the sensing elements are comparatively bulky and comprised of many different components that need to be assembled to achieve the required high-temperature resistance. This leads to high complexity of the sensor assembly, which in turn increases the risk of reliability issues and sensor malfunction over time.
The solution: Mechanically robust, small, and simplified designs
Using a novel material combination, SCHOTT offers sensor feedthroughs that are hermetically sealed, making them more robust in high temperatures and temperature cycling while enabling highly reliable and continuously precise signal transmission over the lifetime of a car. At the same time, the axial space required for sensors using Heatan™ technology can be miniaturized by more than 50 percent. Sensor manufacturers also benefit from higher cost-efficiency thanks to a significant reduction of production steps needed when using this single-component solution.