Voomahu mõõtmiseks mõlemas suunas võib kasutada sümmeetrilist teravkandiga mõõteava, mille mõlemad servad on kandilised ja mille puhul mõõtediafragma/plaadi kogupaksus ei ületa mõõteava pikkust.
For measuring the flow-rate in either direction, a symmetrical orifice plate can be used in which both edges of the orifice comply with the characteristics of the upstream edge of the the square-edged orifice plate and for which the overall thickness of the plate does not exceed that of the orifice.
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