Patent ID: 6058774
Filing Date: 2000-05-09
Classification: G01F,G01P

Abstract:
A device for detecting flow of a fluid, including a temperature measuring instrument which comprises:a thermoelement completely provided in the flow path of the fluid and consisting of two wires, each of a different material, each wire having a first end at which they are conductively connected together, forming a first end of the thermoelement, and each wire having a second end connected, through a connecting line consisting of a material different from those of said wires, to an evaluation device so that the first end of the thermoelement forms a first temperature measuring point, second ends of the thermoelement forming a pair of a second temperature measuring point and a third temperature measuring point disposed adjacent the second temperature measuring point;a heating element disposed substantially in a direction of flow of the fluid between the first temperature measuring point and the pair of second and third temperature measuring points; anda regulating device regulating an energy for the heating element to a constant value;wherein upon a change in a flow velocity of the fluid the evaluation device measures a time elapsing between a cooling down of one of the first and the pair of second and third temperature measuring points and a heating up of the other of the first and the pair of second and third temperature measuring points as an indicator of the flow velocity.