Patent ID: 7970557

Claim:
A gas appliance judgment apparatus, comprising: a flow volume measurement means for measuring the instantaneous flow volume of gas flowing inside a gas flow channel; a noise removal means for removing noise from the instantaneous flow volume data which has been measured by the flow volume measurement means; an object extraction means for extracting data of a variable portion and a flat portion of the flow volume, from the instantaneous flow volume data from which the noise has been removed by the noise removal means; a characteristics extraction means for extracting, as the characteristics of the gas flow, characteristics of the data of the variable portion and the flat portion of the flow volume which has been extracted by the object extraction means; a rule storage means for storing respective rules which include characteristic data of the variable portion and the flat portion of the flow volume, for respective types of gas appliance or for a gas leak; and an appliance judgment means for determining the type of gas appliance in use or the presence or absence of a gas leak and outputs a judgment result, by comparing the characteristics data included in the rules stored in the rule storage means with the characteristics of the gas flow which has been extracted by the characteristics extraction means; wherein the characteristics extraction means is composed so as to extract characteristics including a combination of an instantaneous flow volume and the time differential value of the instantaneous flow volume as the characteristics of the variable portion of the flow volume.