RESIDUAL AMOUNT MANAGEMENT SYSTEM, GAS METER, AND AUTOMATIC SWITCHING REGULATOR

To provide a residual amount management system capable of preventing the complication of a configuration and reduction in aesthetic appearance, a gas meter, and an automatic switching regulator.SOLUTION: A residual amount management system 1 comprises: an automatic switching regulator 2 introducing fuel gas from a spare-side high-pressure gas cylinder B2, when an amount of gas in a use-side high-pressure gas cylinder B1 becomes equal to or less than a predetermined amount; and a gas meter 3 introducing fuel gas depressurized by the automatic switching regulator 2 to supply the gas to a consumer side after flow rate measurement, and transmitting, to the outside, a fact that the system is in a switched state of introducing fuel gas from the spare-side high-pressure gas cylinder B2 with the amount of the fuel gas in the use-side high-pressure gas cylinder B1 becomes equal to or less than the predetermined amount. The gas meter 3 comprises: a pressure sensor detecting a gas pressure; a determination unit determining whether or not a gas pressure at a specified gas flow rate has decreased by a predetermined pressure or more on the basis of a detection result detected by the pressure sensor; and a residual amount management unit determining that the system is in the switched state when the determination unit determines that the gas pressure has decreased at least by the predetermined pressure.SELECTED DRAWING: Figure 1 【課題】構成の複雑化及び美観の低下を抑制することが可能な残量管理システム、ガスメータ、及び、自動切替調整器を提供する。【解決手段】残量管理システム１は、使用側の高圧ガスボンベＢ１のガス量が所定量以下となったときに、予備側の高圧ガスボンベＢ２からの燃料ガスを導入する自動切替調整器２と、自動切替調整器２によって減圧された燃料ガスを導入して流量計測のうえ需要者側に供給すると共に、使用側の高圧ガスボンベＢ１の燃料ガスが所定量以下となって予備側の高圧ガスボンベＢ２から燃料ガスを導入する切替状態となった旨を外部に送信するガスメータ３とを備え、ガスメータ３は、ガス圧力を検出する圧力センサと、圧力センサによる検出結果に基づいて特定流量におけるガス圧力が所定圧力以上低下したかを判断する判断部と、判断部により所定圧力以上低下した判断された場合に切替状態であると判断する残量管理部とを備える。【選択図】図１