Patent ID: 6670582
Filing Date: 2003-12-30
Classification: G01F

Abstract:
A micro-thermocouple sensor for use in a mass flow meter for a gas circuit, the sensor comprising:a metallic capillary tube having an insulating layer extending therearound and thereover, said tube having a central area, a first side area on one side of said central area and a second side area on an opposite side of said central area; a first active element deposited on said first side area; a second active element deposited on said second side area, said second active element being of an identical material as said first active element; a third active element deposited on said central area, said third active element having a first edge at one end and a second edge at an opposite end, said third active element being of a different material than said first and second active elements, said first active element overlapping said first edge of said third active element, said second active element overlapping said second edge of said third active element, said first active element and said second active element and said third active element and said capillary tube being annealed together; and a heating element extending over said third active element.