GAS IDENTIFICATION SYSTEM

摘要

A gas identification system comprises a passage (7), an ultrasonic instrument (8) including a pair of ultrasonic oscillators (17, 18) and arranged in the passage (7), a unit (10) for calculating the speed of sound in a gas flowing through the passage (7) based on the signal from the ultrasonic instrument (8), a section (12) for storing a predetermined speed of sound, and a comparator (11) for comparing the speed of sound calculated by the section (10) with the speed of sound stored in the section (12). The kind of gas that flows through the passage (7) is specified according to the results of comparison by the comparator (11).