Na phapang ea ho nepahala pakeng tsa li-flowmeter tsa ultrasonic tsa tsela e le 'ngoe le tse nang le litsela tse ngata e tla atoloha ka liphetoho tsa sekhahla sa phallo ha ho lekanngoa liphaephe tse bophara bo boholo (mohlala, DN1000 le ho feta)?

E. Hangata di-flowmeter tsa ultrasonic tse tsamayang ka tsela e le nngwe di lekanya lebelo la phallo bohareng ba phaephe ebe di e fetolela ho lebelo le tloaelehileng la phallo ho pholletsa le karolo e tsheletseng ya phaephe di sebedisa "average velocity coefficient." Coefficient ena e itshetlehile hodima kgopolo ya "phallo e ntshetsweng pele ka botlalo" (moo lebelo le latelang kabo ya logarithmic). Leha ho le jwalo, diphaepheng tse bophara bo boholo, ha sekgahla sa phallo se le tlase (maemong a laminar kapa a tlase a turbulence ka nomoro ya Reynolds < 2300), kabo ya lebelo e haufi le sebopeho sa parabola. Ka lebaka leo, phoso ya phetoho ya dimithara tse tsamayang ka tsela e le nngwe (ho tloha lebelo la bohareng ho ya lebelo le tloaelehileng) e atoloha ho tloha ho ± 1% ho ya ho feta ± 3%.