Liquid meter comprising a circuit for reducing a detection error resulting from a variable flow rate

Claim 1

A liquid meter for measuring a total amount of a liquid flowing, with a variable flow rate, through a path and to indicate said total amount, said meter comprising: magnetic body means rotatable in said path in response to the amount of said liquid flow through the path, the rotation of said magnetic body means being accompanied by a variable instrumental error which varies in accordance with said flow rate; housing means defining a hollow space adjacent said magnetic body means; detection pulse producing means in said hollow space and magnetically coupled to said magnetic body means for producing a sequence of detection pulses, the number of said pulses being related to the amount of said liquid flow, said number of detection pulses generally increasing toward a total number related to said total amount; counting means located in said hollow space and connected to said detection pulse producing means for counting the number of detection pulses produced during each of a plurality of predetermined partial measuring periods to successively produce measurement signals which are representative of individual amounts of said liquid flow, said individual amounts being subject to detection errors resulting from an accumulation of said instrumental errors in each of said partial measuring period; means located in said hollow space for analyzing the number of pulses counted by said counting means during each of said partial periods and correcting for said errors to give a corrected flow rate in each of said partial periods; totalizing means located in said hollow space and responsive to said analyzing means for totalizing said individual amounts in consideration of said detection errors in order to produce a total amount signal which is representative of said total amount; and indicating means responsive to said total amount signal for indicating said total amount.