| 摘要 |
A consumption meter for measuring a consumed quantity of a physical entity, e.g. a consumed amount of water. The meter includes a monolithic polymer structure (1, 5) with a flow passage part (2) for fluid flow and a cavity (6) separated from the flow passage part (2). The cavity (6) houses one or more ultrasound transducers (8), a measurement circuit (9) connected to the ultrasound transducer (8) to allow measurement of a flow rate of the fluid flowing through the through-going opening (2), and a calculation circuit (9) arranged to calculate the consumed quantity of the physical entity based on the flow rate. Preferably, the flow passage part (2) has threaded portions in both ends to allow connection to a piping installation. A display (10) may also be housed within the cavity (6), e.g. visible through a transparent cover serving to provide a watertight enclosure together with the cavity. Preferably, two transducers (8) are positioned inside the cavity (6) and operate through a wall (1) of the monolithic polymer structure separating the flow passage part (2) and the cavity (6), i.e. according to the matching layer principle. The flow passage part (2) may be arranged to receive a measuring tube element and an ultrasound reflector arrangement.
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