GAS SHUTOFF SYSTEM MEASURING FLOW OF GAS MEDIUM ACCURATELY

摘要

PURPOSE: A gas shutoff system is provided to improve the reliability and the safety by measuring the gas flow accurately and inspecting the use condition of the gas apparatus without calculating the correction value in lowering pressure of gas or shutting off gas. CONSTITUTION: A gas shutoff system comprises a flow rate detecting unit measuring the flow rate of a medium; a shutoff unit shutting off the passage of the medium; a flow correction setting unit setting the flow correction value; a flow calculation unit calculating the flow rate based on the flow rate from the flow rate detecting unit and correcting the flow amount; a zero setting unit setting the flow range; a zero decision unit deciding the corrected flow from the flow calculation unit to be within the flow range; an abnormal state decision unit outputting a first shutoff signal to the shutoff unit; and a state decision unit outputting a second shutoff signal to the shutoff unit in deciding the corrected flow to be beyond the flow range without shutting off the passage.