Heat wire airflow meter

摘要

A heat wire type airflow meter having a resistance element disposed within an airflow, the rate of which is measured, and a detection circuit for producing an airflow rate signal by detecting resistance change of the element depending on the airflow rate, in which the resistance element comprises a heat wire coil, lead wires attached to the heat wire coil at both ends thereof, a ceramic layer covering the heat wire coil and junctions of the heat wire coil and the lead wires to form a cylindrical member in such a manner that the heat wire coil is contained therein coaxially and along an inner surface thereof and a glass layer for coating an outer surface of the cylindrical member.