Patent ID: 8166999
Filing Date: 2012-05-01
Classification: F23N,G01F,G01M,Y10T

Abstract:
1. A gas shutoff apparatus, comprising: a flow velocity detection unit which detects a flow velocity by measuring a signal transfer time in a medium; a flow volume calculation unit which converts the flow velocity detected by the flow velocity detection unit into a flow volume; an abnormality determination unit which determines whether or not a use flow volume calculated by the flow volume calculation unit is normal; a shutoff unit which shuts off a fluid path through which the medium flows when the abnormality determination unit determines that there is abnormality; a return unit which outputs a return signal to the shutoff unit to open the fluid path; a return time-counting unit which starts a time-counting on the basis of a return operation of the return unit; and a leakage determination unit which defers performing a leakage determination based on a flow volume detected by the flow volume calculation unit until after the return time-counting unit counts that a predetermined time period has been elapsed from a time of starting the return operation of the return unit.