Patent ID: 6840102
Filing Date: 2005-01-11
Classification: G01F

Abstract:
1. A flow amount measuring apparatus comprising: a flow amount detecting portion disposed in a fluid passage, for detecting information indicative of flow amount of fluid flowing in the fluid passage; a signal generating circuit for generating voltage signal indicative of flow amount based on the information detected by the flow amount detecting portion; and an amplifier circuit for amplifying the voltage signal generated in the signal generating circuit by applying gain and offset, characterized in that the amplifier circuit includes a gain setting circuit for setting the gain, and an offset setting circuit for setting the offset, the offset setting circuit sets the offset as the sum of a first offset variable in accordance with fluid temperature and a second offset invariable in accordance with fluid temperature, and the offset setting circuit is constructed to enable a ratio of the first offset and the second offset to be adjusted in accordance with an externally obtained signal.