| 摘要 |
PURPOSE:To measure up to the large flow rate and to widen a measuring range by fitting a reed switch to the outside of a casing and moreover, rotating an impeller in accordance with the flow rate without necessitating a seal means. CONSTITUTION:The casing is formed of a main body 1 and a cover 2 and a measuring chamber 3 is formed therein and an inlet 4 and an outlet 5 which are opened on the upside are formed on the same axis. Further, a partition wall 6 is provided in the measured chamber 3 and inlet and outlet spaces 7 and 8 are divided and between both spaces is communicated by the space 9 for passing a liquid downward. Then, a horizontal wall 10 which is bent to the outlet 5 side almost orthogonally to the upper part from the outlet 5 of the partition wall 6 is provided. An orifice 11 to pass gas in its vertical direction is opened and the impeller 14 to rotate in proportion to the flow rate therefrom is arranged in the downstream space. Then, a permanent magnet 16 is fitted to the impeller 14 and a read switch 18 is fitted to the position close to a locus of the permanent magnet 16 at the outside wall surface of the casing. Then, when the gas just for the consumption volume passes through the orifice 11, the rotation of the impeller 14 is counted by on and off of a switch 18 and the flow rate of the gas is operated and displayed 19.
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