Ühesuunakaldultrahelikiiremõõturi abil mõõdetakse kas faasinihet või levimisaja erinevust toru üles- ja allavoolu levivate ultrahelikiirte vahel ning seda kasutatakse voomahu arvutamiseks.
By the single-path diagonal-beam meter either the phase shift or difference in time of flight between the beams emitted, upstream and downstream is measured and used to calculate the flow-rate.
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