FLOW RATE MEASURING DEVICE

To provide a flow rate measuring device capable of measuring the flow rate of fluid with good accuracy.SOLUTION: A passage on a main flow side is divided into a sensor-side first passage 12 provided at a center of a fluid passage and a second passage 13 composed of a plurality of bypass flows provided on the outside of the first passage 12, and a third passage 15 leading from the first passage 12 through a sensor to the first passage 12 is provided. The flow rate of fluid circulating through the third passage 15 is detected by the sensor and converted into an electric signal. The flow rate of fluid circulating through the third passage 15 is calculated on the basis of the electric signal. The flow rate of fluid circulating through the main flow-side passage is calculated on the basis of the flow rate of the fluid circulating through the third passage 15.SELECTED DRAWING: Figure 2 【課題】精度よく流体の流量を測定することができる流量測定装置を提供すること【解決手段】本流側の流路を、流体の流路の中心に設けたセンサー側の第一流路１２と第一流路１２の外側に設けた複数のバイパス流からなる第二流路１３に分け、第一流路１２からセンサーを経て第一流路１２に至る第三流路１５を有し、第三流路１５を流通する流体の流量を上記センサーで検知して電気信号に変換し、上記電気信号に基づいて第三流路１５を流通する流体の流量を求め、第三流路１５を流通する流体の流量に基づいて本流側流路を流通する流体の流量を得る。【選択図】図２