| 摘要 |
A flow rate and volume sensor for determining the rate and volume of fluid flowing through an apparatus, such as an apparatus for filtering and/or conditioning and/or purifying fluid, such as water, and for indicating when a predetermined volume of fluid has flowed through the apparatus to, for example, signal when a cartridge filter housed in an apparatus for filtering and/or conditioning and/or purifying fluid should be replaced. In an apparatus for filtering and/or conditioning and/or purifying fluid, such as water, having a pressure vessel, an inlet port formed in the pressure vessel for introducing fluid to the pressure vessel, an outlet port formed in the pressure vessel for discharging fluid from the pressure vessel, and a chamber formed in the pressure vessel between the inlet and outlet ports for holding a cartridge filter, the fluid flow rate and volume sensor comprises an impeller mounted inside the pressure vessel for rotating in response to and at a rate in proportion to fluid flowing through the pressure vessel and past the impeller device, and a sensor device positioned outside the pressure vessel responsive to the impeller device for determining rate and volume of fluid flowing through the pressure vessel and for indicating when a cartridge filter housed in the apparatus for filtering and/or conditioning and/or purifying fluid is to be replaced based upon a determination by the sensor device that a predetermined volume of fluid has flowed through the pressure vessel.
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