Gas block device and gas block method

Abstract

A use condition of gas equipment is monitored. An abnormality determination unitdetermines whether or not a use flow volume obtained by detecting a flow velocity obtained by measuring a signal transfer time in a medium using a flow velocity detection unitand converting the detected flow velocity into a flow volume using a flow volume calculation unit. When the shutoff unitshuts off a fluid pathwhen it is determined that there is abnormality, a return signal is output from a return unitto a shutoff unitin order to use the gas again by opening the fluid path. Simultaneously, when a return time-counting unitstarts the time-counting operation, and then, a predetermined time period has been elapsed, the flow volume calculation unitdetermines whether or not a predetermined flow volume of greater flows in order to identify whether or not all of the gas plugs of the gas equipment connected to the downstream of the gas shutoff apparatusare closed. The leakage determination unitdetermines that there is leakage when a predetermined flow volume or greater is detected, and a driving signal is output to the shutoff unitto close the fluid path