Abstract: The three main factors restricting the range expansion of throttling differential pressure flowmeter are described: differential pressure measurement accuracy, non-linearity of flow-out coeficient; and variation of coeficient of expandability. The rangeability ofAnnubar flowmeter is analyzed, and the methods of expanding rangeability and enhancing systematic accuracy are discussed.Keywords Differential pressure flowmeter Ammbar Rangeability Undete-ninedness Auto-correctionAbstract Three factors restricting the range expansion of throttling differential pressure flowmeter are described.The three main factors restricting the range expansion of diferential pressure; non-linearity of flow-out coeficient; and variation of coeficient of expandability. The rangeability ofAnnubar flowmeter is analyzed, and the methods of expanding rangeability and enhancing systematic accuracy are discussed.Keywords Diferential pressure flowmeter Ammbar Rangeability Undete-ninedness Auto-correction
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