GAS INTERRUPTING DEVICE

PROBLEM TO BE SOLVED: To set an optimal interrupting value automatically by distinguishing gaseous species. SOLUTION: The gas interrupting device is equipped with a propagating time measuring means 21 for determining the propagating time of supersonic wave in each direction changed with a changing means 18, a flow rate operating means 10 for calculating flow rate from the propagating time, an abnormality discriminating means 11 for discriminating abnormal use of gas, an interrupting value memory means 23 for memorizing a variety of interrupting values for abnormality discrimination, a propagating time memory means 22 for memorizing propagating time data of supersonic wave in various gas media, and a media discriminating means 13 for specifying gas species used from the propagating time determined at a propagating time measuring means 21 and the propagating time data memorized in the propagating time memory means 22. When the gas interrupting device is installed, it is composed to have an interrupting value setting means 14 for setting a variety of interrupting values depending on gas species used automatically distinguished with the media discriminating means 13. COPYRIGHT: (C)2007,JPO&INPIT