Impeller flow meter

The present invention provides a flow meter capable of measuring a flow rate in a wide temperature range of a fluid temperature from a low temperature to a high temperature. The flowmeter includes a metallic body 2 that has a flow path 6 therein, an impeller 10 that is rotatably supported in the flow path 6 inside the body, a pickup coil 30 that is configured to detect a number of rotations of theimpeller 10, a coil case 50 that is made of metal and accommodates the pickup coil, an amplifier circuit board 40 that is configured to amplify a detection signal of the pickup coil 30, and an amplifier case 60 that is made of resin, and accommodates the amplifier circuit board. The coil case and the amplifier case are connected via a connection case 70 that is made of resin and includes an insulation material 72 therein. The flow meter prevents direct transmission of temperature from the main body (2) to the amplifier circuit board (40). 本发明提供一种流量计，其能够在流体温度从低温到高温的宽泛的温度范围内测定流量。本发明的流量计(1)具备：金属制的主体(2)，其在内部具有流路(6)；叶轮(10