GAS METER AND EARTHQUAKE DETERMINING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a gas meter for breaking gas supply reliably only, in the case of an earthquake by discriminating the earthquake from shock, and to provide an earthquake determining method for discriminating earthquakes from shocks. SOLUTION: The gas meter comprises a multi-stage seismoscope 1 having a first seismoscope 10 for detecting vibration at a specific sensitivity for outputting as a pulse signal; a second seismoscope 11 for detecting vibration with lower sensitivity than a specific one for outputting as a pulse signal; a detection circuit 2 for detecting whether a pulse signal from the first seismoscope includes pulses exceeding specific width at least by a specific number within specific time; a time measurement circuit 3 for detecting whether or not a time difference, until a pulse signal is outputted from the second seismoscope after a pulse signal is outputted from the first seismoscope is equal to or more than specific time; and a controller 7 for breaking gas supply, when it is detected that pulses exceeding specific width are included at least by a specific number within specific time using a detection circuit, and the time difference is equal to or more than a specific time in a time measurement circuit.