Sensor unit for gas sensor for determining physical characteristic i.e. concentration, of measuring gas, has embeddings with crack growth restraining characteristics enclosed between two heat insulations laterally next to heater

摘要

The sensor unit has an electrical heater (19) with high thermal expansion coefficients and a heater insulator (18) arranged between two heater insulations (21, 22). Embeddings (25, 26) with crack growth restraining characteristics are enclosed between two heat insulations laterally next to the heater. The embeddings have a material whose modulus of elasticity is smaller than modulus of elasticity of a material of the heat insulator.