Patent ID: 7465087

Claim:
A temperature sensor for approximating fluid temperature averaged across a location range in a duct, the sensor comprising: an insulated sensing circuit which is flexible and extends longitudinally, the insulated sensing circuit comprising: at least one resistance temperature detector (RTD) having a first lead, a second lead, and a sensing element which changes electrical resistance between the first and second leads as a function of temperature; circuit wires electrically connecting the RTD in a circuit via attachment to the leads, each circuit wire being formed of metal; dielectric insulation which seals around the circuit wires, the first lead, the second lead, the attachments between the first and second leads and the circuit wires and the RTD; and a woven metallic armour layer substantially exposed for fluid contact with the fluid being sensed, the woven metallic armour layer being flexible and extending longitudinally around the insulated sensing circuit, the woven metallic armour layer having a plurality of metallic strands extending longitudinally for heat conduction in the longitudinal direction toward or away from the RTD; wherein the sensing element of the RTD occupies a point relative to the length of the woven metallic armour layer, such that the heat conduction in the longitudinal direction toward or away from the RTD causes the point of the sensing element to sense a conduction-adjusted temperature relative to the length of the woven metallic armour layer.