DEVICE MEASURING SMALL-SCALE FLOW RATE OF GAS Russian patent published in 2003 - IPC

FIELD: measurement technology. SUBSTANCE: thermal flowmeter incorporates sealed heatinsulated metal case housing heat exchanger-heater and gas distribution chamber to supply flow coming into it into measurement and thermal compensation conduits which are identical. Temperature-sensitive elements in the form of semiconductor temperature-sensitive resistors of indirect heating are positioned in conduits of case, additional heaters are mounted on outer surfaces of conduits. Temperature-sensitive element of thermal compensation conduit is placed in electronic circuit of unit controlling power of heaters. EFFECT: increased accuracy, reliability and sensitivity of measurements in wide range of temperatures of supplied gas and environment. 1 dwg