Patent ID: 8015870

Claim:
A flowmeter comprising: a flow tube through which fluid flows; a cooling apparatus adapted to cool a part of the flow tube; a first temperature detecting section adapted to detect a temperature of a cooling region of the flow tube, the cooling region being cooled by the cooling apparatus; a second temperature detecting section adapted to detect a temperature of the cooling apparatus; a third temperature detecting section adapted to detect a temperature of a non-cooling region upstream of the cooling region in the flow tube; and an information processing section adapted to control the cooling apparatus so as to make a difference between a detected temperature by the second temperature detecting section and a detected temperature by the third temperature detecting section equal to a predetermined value, and calculate a flow rate of the fluid flowing through the flow tube on a basis of a difference between the detected temperature by the second temperature detecting section and a detected temperature by the first temperature detecting section, wherein the second temperature detecting section being arranged on the cooling apparatus so as to measure a temperature of a portion of the cooling apparatus in which a temperature is first influenced by the fluid because of the flow of the fluid through the flow tube, wherein the portion of the cooling apparatus is on an upstream side in the cooling region of the flow tube.