GAS METER, AND CONTROL METHOD OF GAS METER

To increase safety by detecting gas leakage actively when there is a possibility of a high risk of occurrence of gas leakage in a secondary side of a gas meter after occurrence of earthquake motion.SOLUTION: A control method of a gas meter executes: pressure cutoff control for closing a cutoff valve 30 when pressure measured by a pressure measurement part S1 becomes less than a pressure drop cutoff threshold determined in advance, or when pressure measured by the pressure measurement part S1 exceeds a pressure increase cutoff threshold determined in advance; and a pressure cutoff threshold value update control for changing and setting the pressure drop cutoff threshold to a higher side, or changing and setting the pressure drop cutoff threshold to a higher side and changing and setting the pressure increase cutoff threshold to a lower side during a restoration period as a predetermined period after execution of gas cutoff control.SELECTED DRAWING: Figure 1 【課題】地震動が発生した後であって、ガスメータの二次側においてガス漏洩が発生する虞が高くなっている可能性がある場合に、積極的に当該ガス漏洩を検知して安全性を高くする。【解決手段】圧力計測部Ｓ１にて計測される圧力が予め決定される圧力低下遮断閾値未満となる場合又は圧力計測部Ｓ１にて計測される圧力が予め決定される圧力上昇遮断閾値超える場合に遮断弁３０を閉止する圧力遮断制御と、ガス遮断制御が実行された以降の所定の期間である復旧期間の間、圧力低下遮断閾値を高い側へ変更設定する、又は圧力低下遮断閾値を高い側へ変更設定すると共に圧力上昇遮断閾値を低い側へ変更設定する圧力遮断閾値変更制御とを実行する。【選択図】図１