Panasonic Intellectual Property Management Co., Ltd.

Kazuki Shiota

Tadanori Shirasawa

Nobuaki Murabayashi

Yoshikuni Tamura

Yuji Fujii

Kenji Yasuda

Yasuo Koba

Ryuji Iwamoto

A gas meter includes flow rate measurer that measures a flow rate of gas in time series and storage unit that stores the flow rate measured by flow rate measurer as flow rate data. The gas meter also includes storage condition setting unit that determines a condition for storing the flow rate data in storage unit and communication unit that communicates with center device. Storage unit stores the flow rate data to satisfy the condition set by storage condition setting unit.

Gas meter

Gas meter and center device are provided. Gas meter includes flow rate measurer that measures a flow rate of gas in time series. Center device receives and analyzes flow rate data from gas meter, and monitors states of use of gas appliances. Gas meter detects the start of operation of gas appliances, and transmits flow rate data during predetermined periods before and after the start of operation in accordance with a request from center device. Center device monitors the states of use of gas appliances based on the received flow rate data.

Gas appliance monitoring system

A gas meter and a center device, including an analyzer, analyze a cause of an abnormality determination. The center device requests analysis-use data necessary to analyze the cause of the abnormality determination from the gas meter, through a communication by a center communication unit, based on the abnormality type data received from the gas meter. The gas meter transmits the analysis-use data requested by the center device to the center device by a meter communication unit, and the analyzer of the center device determines the cause of the abnormality determination based on the received analysis-use data.

Gas meter system

Flow rate measurement is performed with a propagation time by using a pair of ultrasonic wave oscillators which is provided in flow path through which a fluid to be measured flows, and is disposed so as to transmit and receive an ultrasonic wave signal by causing the ultrasonic wave signal to be reflected on an inner wall of flow path at least once. In addition, adjustment of an amplification rate is periodically performed by amplifier, which amplifies the ultrasonic wave signal received by each of the ultrasonic wave oscillators to a predetermined amplitude, and a difference between a previous amplification rate and a current amplification rate is a predetermined value or more, and the instantaneous flow rate calculated by flow rate calculation unit is a predetermined flow rate or less, the reference voltage is adjusted by reference voltage setting unit. With the configuration, the propagation time can be stably measured and deterioration of the maximum amplitude is prevented.

Growing community of inventors

Kyoto, Japan

Kazuki Shiota