Abstract: A flow rate measuring device simplifies calculation, reduces memory required for calculation, absorbs variations due to manual operation and, depending on the state of ignition, improves the accuracy of appliance identification by extracting features of appliances. The flow rate measuring device includes: a difference value conversion unit that converts into codes difference values of the flow rate measured at constant time intervals by an ultrasonic flowmeter; an appliance feature extraction unit creates an appliance feature code string indicating a feature of each appliance by, for example, making comparison and judgment using a third last code, a second last code, a last code and a current code of the codes obtained at constant time intervals, and by performing code deletion; and an identification unit performs appliance identification by comparing the appliance feature code string with an appliance inherent feature code string indicating the feature code string inherent in each appliance.

Abstract: A newly-purchased gas appliance is detected and reported to a gas administrator. There are provided a flow rate detection portion, a flow rate calculation portion, a code extraction portion, an initial code learning portion, a code maintaining portion, a code judging portion, an additional code learning portion, and an external communication portion. The code extraction portion extracts a code pattern E. The initial code learning portion gathers similar code patterns E as a gas appliance code pattern F. The code judging portion judges whether or not the code pattern E matches any of gas appliance code patterns F held by the code maintaining portion within a predetermined range. The code patterns E that have failed to match are subjected to additional identification of a gas appliance in the additional code learning portion.

Abstract: With a gas shutoff device in the related art, a non-uniform gas layer can be produced by mixing of a gas of a different type from the gas currently in use during a shift in the amount of heat or installation or replacement, and an unexpected flow rate may be detected due to a disruption in the propagation of ultrasonic waves, thereby causing an erroneous determination of a flow rate abnormality or a sensor abnormality. With the gas shutoff device according to the invention, a valve-closing timer section 14 starts to time based on a valve-closing signal which is output by the flow rate abnormality or the sensor abnormality, and outputs a valve-opening signal to a valve driving section 12 if a release input is accepted from outside within a setting time period.

Abstract: An object is to prevent a mistaken shutoff caused by the mistaken registration of an appliance of which an amount of gas used changes. An individual flow registration maintenance unit maintains a registered flow rate deleted due to an increase/decrease in flow rate, again, performs determination on the flow rate maintained when a new flow rate is registered or a flow rate added with the maintained flow rate, and in the case where it is regarded to be the same, re-register the maintained flow rate.

Abstract: It is an objective to appropriately assure a function of limiting use of appliances that cause changes in quantities of gas used.

Abstract: A newly-purchased gas appliance is detected and reported to a gas administrator. There are provided a flow rate detection portion, a flow rate calculation portion, a code extraction portion, an initial code learning portion, a code maintaining portion, a code judging portion, an additional code learning portion, and an external communication portion. The code extraction portion extracts a code pattern E. The initial code learning portion gathers similar code patterns E as a gas appliance code pattern F. The code judging portion judges whether or not the code pattern E matches any of gas appliance code patterns F held by the code maintaining portion within a predetermined range. The code patterns E that have failed to match are subjected to additional identification of a gas appliance in the additional code learning portion.

Abstract: An object of the present invention is to make a function of limiting the use time appropriate by appropriately registering flow rates of appliances.

Abstract: The present invention provides a flow rate measuring device capable of simplifying calculation, reducing the amount of a memory required for the calculation, absorbing variations due to manual operation and depending on the state of ignition, and improving the accuracy of appliance identification by using a configuration in which the features of appliances are extracted. The flow rate measuring device is formed of a difference value conversion unit 112 for converting the difference values of the flow rate measured at constant time intervals by an ultrasonic flowmeter 104; an appliance feature extraction unit 214 for creating an appliance feature code string indicating the feature of each appliance by making comparison and judgment using the third last code, the second last code, the last code and the current code of the codes obtained at constant time intervals and by performing code deletion, etc.

Abstract: An object of the present invention is to perform a suitable registration of a flow rate of appliances to promote the optimization of a usage time limitation function.

Abstract: With a gas shutoff device in the related art, a non-uniform gas layer can be produced by mixing of a gas of a different type from the gas currently in use during a shift in the amount of heat or installation or replacement, and an unexpected flow rate may be detected due to a disruption in the propagation of ultrasonic waves, thereby causing an erroneous determination of a flow rate abnormality or a sensor abnormality. With the gas shutoff device according to the invention, a valve-closing timer section 14 starts to time based on a valve-closing signal which is output by the flow rate abnormality or the sensor abnormality, and outputs a valve-opening signal to a valve driving section 12 if a release input is accepted from outside within a setting time period.

Abstract: An object of the invention is to avoid a gap between the total using amount of gas and the sum of a plurality of change amounts held in a gas cutoff device. The gas cutoff device includes a flow rate detection unit 11, a flow rate calculation unit 12, an increase and decrease calculation unit 13, an increase and decrease determination unit 14, a valve driving unit 15, a valve 16, an increase and decrease correction unit 17, and a constant increase and decrease correction unit 18. The increase and decrease determination unit 14 acquires a corrected change amount ‘G’ from the increase and decrease unit 17 or the constant increase and decrease correction unit 18 and adopts the amount as a new change amount ‘C’. In this way, it is possible to prevent the using time of gas until the gas path is closed from being lengthened.

Abstract: An object of the present invention is to promote the optimization of a usage time limitation function of performing a suitable registration of an appliance flow rate.

Abstract: It is an objective to appropriately assure a function of limiting use of appliances that cause changes in quantities of gas used.

Abstract: An object is to prevent a mistaken shutoff caused by the mistaken registration of an appliance of which an amount of gas used changes. An individual flow registration maintenance unit maintains a registered flow rate deleted due to an increase/decrease in flow rate, again, performs determination on the flow rate maintained when a new flow rate is registered or a flow rate added with the maintained flow rate, and in the case where it is regarded to be the same, re-register the maintained flow rate.

Abstract: To provide a flowmeter capable of enhancing metering resolution to thus effect accurate metering. When a fluid to be measured is supplied to or discharged from a metering chamber 4, a membrane 11 provided in the metering chamber 4 is reciprocally actuated, and a rotation section R1 performs rotational movement in association with reciprocal movement of the membrane 11. At this time, since the rotation section R1 is provided with a magnet 5 or a direction sensor 6, the magnet 5 or the direction sensor 6 also effects rotational movement. The direction sensor 6 detects rotational movement, to thus determine a relative position between the membrane and the rotation section. Thus, the position of the membrane 11 can be detected, and metering resolution is enhanced. Thus, accurate metering can be performed.

Abstract: To provide a flowmeter capable of enhancing metering resolution to thus effect accurate metering. When a fluid to be measured is supplied to or discharged from a metering chamber 4, a membrane 11 provided in the metering chamber 4 is reciprocally actuated, and a rotation section R1 performs rotational movement in association with reciprocal movement of the membrane 11. At this time, since the rotation section R1 is provided with a magnet 5 or a direction sensor 6, the magnet 5 or the direction sensor 6 also effects rotational movement. The direction sensor 6 detects rotational movement, to thus determine a relative position between the membrane and the rotation section. Thus, the position of the membrane 11 can be detected, and metering resolution is enhanced. Thus, accurate metering can be performed.