초록 ▼

A flow rate of a gas is measured by a flow rate measurement means, and when the flow rate exceeds a predetermined reference value, occurrence of an abnormal state such as escape of the gas is detected and a shutoff means is automatically closed by control of a microcomputer, futhermore, “a gas consu

A flow rate of a gas is measured by a flow rate measurement means, and when the flow rate exceeds a predetermined reference value, occurrence of an abnormal state such as escape of the gas is detected and a shutoff means is automatically closed by control of a microcomputer, futhermore, “a gas consumption pattern”showing combination of an amount of gas consumption, maximum flow rate and continuous consumption time of a consumer is observed in a predetermined time period, and a reference value of the gas consumption pattern is decided on the basis of the consumption state, moreover, a decision level of abnormal state is varied and set as a new reference values corresponding to the gas consumption pattern.

대표청구항 ▼

A gas shutoff apparatus comprising: flow rate measurement means for generating a flow rate signal corresponding to a flow rate of a gas in a gas supply tube, initial condition setting means, comprising a manual input device, for presetting a normal condition of gas consumption given by said flow rat

A gas shutoff apparatus comprising: flow rate measurement means for generating a flow rate signal corresponding to a flow rate of a gas in a gas supply tube, initial condition setting means, comprising a manual input device, for presetting a normal condition of gas consumption given by said flow rate signal and by a consumption time of the gas on the basis of said flow rate signal, processing means for 1) detecting a consumption state identified by said flow rate and said consumption time, (2) comparing said consumption state to a normal condition of gas consumption, and (3) generating a shutoff signal if said consumption state deviates from said normal condition of gas consumption, timer means for measuring a predetermined time period, starting signal generating means for starting said timer, consumption-state memory means for memorizing said consumption state of the gas of the basis of said flow rate signal during operation of the timer, varying means of normal condition of gas consumption for modifying said normal condition of gas consumption in response to changes in said consumption state in the consumption-state memory, and shutoff means for interrupting said gas supplying pipe line by said shutoff signal.