MAGNETO GAS METER WITH A FUNCTION OF MONITORING ACCESS OF AN INTERFERENCE MAGNET CAUSING DISTORTION OF A MAGNETIC FIELD

摘要

PURPOSE: A magnetic device for measuring the amount of used gas is provided to compensate for error by sensing the access of an external interference magnet. CONSTITUTION: One or more first magnetic sensors(110) detect the change of magnetic field strength according to the motion of a measurement magnet(160). One or more second magnetic sensors(120) diversify the output with the access of a disturbance magnet. The disturbance magnet causes the change of the magnetic field which is stronger than the measurement magnet. A memory(180) stores data. An operation unit(170) measures the amount of used gas. The operation unit records the access history in the memory. The amount of used gas is counted according to the magnetic signal.