| 摘要 |
The invention concerns a gas meter comprising, an ultrasonic metering conduit with longitudinal axis including an inner part wherein the gas flows, at least two ultrasonic transducers spaced along the longitudinal axis. The invention is characterised in that said meter comprises between each transducer and the metering conduit inner part a portion of greater width relative to said transducer active surface dimensions, said meter further comprising at least an element located at least in one of said at least wider portions and extending over the whole internal part thereof so as to form a filtering screen with respect to the dust particles transported by the gas, said element being traversed by ultrasonic waves emitted by the transducers over at least part of its width which is greater than said transducer active surface dimensions. |
