Patent ID: 8219330

Claim:
A gas appliance judgment apparatus, comprising: a flow volume measurement means and pressure measurement means for measuring the instantaneous flow volume and the pressure of gas flowing inside a gas flow channel; a noise removal means for removing noise from the instantaneous flow volume data and pressure data which has been measured by the flow volume measurement means and the pressure measurement means; an object extraction means for respectively extracting data of a prescribed time period at respective sampling timings, from the instantaneous flow volume data and pressure data from which noise has been removed by the noise removal means; a characteristics extraction means for extracting, as the characteristics of the data of the prescribed time period which has been extracted by the object extraction means, characteristics including the dispersion in the ratio between the flow volume and the square root of the pressure or the ratio between the flow volume and the pressure; a governor presence judgment means for judging the presence or absence of a governor in use and outputs a judgment result on the basis of the characteristics of the data of the prescribed time period which has been extracted by the characteristics extraction means; and wherein the noise removal means is composed such that if data corresponds to any one of the three conditions: “flow volume is not more than a prescribed value” “flow volume variation is not less than a prescribed value or prescribed ratio” and “variation in square root of pressure or pressure value is not less than a prescribed value or prescribed ratio”, then the data is removed from the instantaneous flow volume data and pressure data which has been measured by the flow volume measurement means and pressure measurement means.