THERMAL CONDUCTOMETRIC GAS SENSOR Russian patent published in 2001 - IPC

FIELD: analytical instrumentation measuring concentration of hydrogen, helium, freon and other gases whose thermal conductivity differs from thermal conductivity of air. SUBSTANCE: thermal conductometric gas sensor has working chamber housing working and comparison sensitive elements in the form of film temperature-sensitive resistors deposited on dielectric substrates. Working sensitive element is positioned between upper and lower walls of working chamber and is attached to lower wall with the help of intermediate inserts and comparison sensitive element is placed above working sensitive element. Clearances for access of analyzed gas through holes made in wall of working chamber are formed between sensitive elements and between working sensitive element and upper wall of working chamber. EFFECT: reduced labor input, simplified manufacturing technology, increased measurement precision. 1 dwg