FLOW RATE MEASURING METHOD AND FLOWMETER, FLOW RATE MEASURING SECTION PACKAGE USED FOR THEM AND FLOW RATE MEASURING UNIT USING THEM, AND PIPING LEAKAGE INSPECTION DEVICE USING FLOWMETER

摘要

A measurement section (16) provides output (Vh) by feed-back controlling a heating element (163) based on temperature detected by heat sensor (162). The measurement sections (18a,18b) provide output (Vout) based on temperature difference detected between heat sensor (182) and temperature sensor. The flow rate is output based on output (Vh) or (Vout), when flow rate is greater/lesser than preset value respectively. Independent claims are also included for the following: (1) flowmeter; (2) flow rate measuring section package; (3) flow rate measuring unit; and (4) piping leakage inspection device using flowmeter.