Patent ID: 6098455
Filing Date: 2000-08-08
Classification: G01F

Abstract:
A thermal type flow meter, comprising:a thermal type flow rate detector means including a plurality of thermal type flow rate detector elements mounted on a support plate, the support plate comprising a hard layer consisting of hard materials and a glass substrate formed on the metal layer wherein the hard layer has a hardness greater than said glass substrate layer;a power source for applying power to said thermal type flow rate detector elements; andarithmetic processor means for calculating a flow amount on the basis of supplied power,wherein said support plate of the thermal flow rate detector elements include heater wires fabricated onto a semiconductor substrate,wherein said support plate of the thermal type flow rate detector means varies in thickness from one portion to another thereof, the flow meter formed so that the position of the radial center of gravity differs from the center of length in the radial direction of the flow meter.