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2、lowmeters 1980 1 ISO 4185, Measurement of liquid flow in closed conduits Weighing method . 1 . , , . . . . , . , 1.5 m 3 /s . (potential) , , 1 . . 2 . . ( ) . KS B ISO 4006：2004, KS B ISO TR 5168：1998, 3 . KS B 5325:2009 2 3.1 3.2 ( .) 3.3 (bypass) 3.4 . , 3.5 4 SI , (Kelvin) (Celsius) . 5 SI q m M
3、T 1kg/s q V L 3 T 1m 3 /s m M kg V L 3m 3t T s ML 3kg/m 3 a(20 , 1 bar a ) ML 3kg/m 3 p ML 3kg/m 3s x x x e e s E s e R E R a1 bar10 5Pa KS B 5325:2009 3 6 , . . ( ) KS B ISO TR 5168 . 7 7.1 7.1.1 1A, 1B 1C . . ( ) . . , 10. A . 1A ( , ) KS B 5325:2009 4 1B ( ； , ) 1C ( , ) KS B 5325:2009 5 1D ( , )
4、 7.1.2 ( 1D ) . , . . , 10. A . 7.1.3 . , . 7.2 7.2.1 . 7.2.2 , , . , , ( 95 % ) 0.1 % . KS B 5325:2009 6 7.2.2 , . a) . b) ( ) ( ) , ( ) . c) . . d) , . e) , . f) . 8 8.1 . (gutter) , (baffle plate) ( 2 ). ( 0.1 ). . , 15 50 . , , 20 000 Pa . , , . . , (performance rate)( 1 s 2 s) , . , . A . KS B
5、5325:2009 7 2 8.2 , , . 0.01 s . (source) , . ( , ) . , 3 , , . , . ( 4 ) . . 3 , A . 0% KS B 5325:2009 8 4 8.3 . 8.1 8.2 , 30 s. , A . , . (baffle) . . , . . (base) , ( , , ). (siphon break) (siphon) (self-priming) (submersible) . . , . 8.4 , , . OIML Recommendations Nos. 3 28 . , . OIML Recommenda
6、tions Nos. 1, 2, 20 33 . KS B 5325:2009 9 . , , . (10.1 ). 8.5 , . ( B ) . , . , 0.5 10 4 . , . , , , , ( ) . , . . 9 9.1 , ( ). (m 0 ) . , , . , , (t) . (m 1 ) . . 9.2 , , (M 1 ) , . ( m) (pan) . (t) . ( m) ( m 1 m 0 ) . . , KS B 5325:2009 10 9.3 2 . , . 10 10.1 (m) (t) . a p a 0 1 m 1 1 t m m t m
7、q , t A . , . . ) 1 ( 0 1 t m m q m p a 1 1 , ( ) . 1 000 kg/m 3 a 1.21 kg/m 3 (20 1 bar) p 8 000 kg/m 3 (OIML Recommendation No. 33 ) , 1.0610 3 , t m m q m 0 1 06 001 . 1 10.2 10.1 , B (, ). ) 1 ( 0 1 t m m q q m VKS B 5325:2009 11 11 KS B ISO TR 5168 , 11.1 C (3) . , 2 ( e R ) 95 e s , 2 ( E R )
8、95 E s , . a) q (e R ) 95 q 1 ；e s q 2KS B ISO TR 5168 b) q (E R ) 95 q 3 %；E s q 4% KS B ISO TR 5168 , (rootsumsquare) . ( e R ) 95 ( E R ) 95 C (3) . , . c) q q (e R ) 95 q 1KS B ISO TR 5168 d) q(110 2 q ) (E R ) 95 q 3 % KS B ISO TR 5168 11.2 , . , 1 . , . . 11.2.1 11.2.1.1 KS B 5325:2009 12 , .
9、a) (notch) b) . 5 . 5 , . ma 0 a 1 ma 2 m 2 a n m n . ( m) . ( m) m 2 m 1 5 , ( m) ( e s ) b . . (E s ) b 0.05 % . ( m) , 0.05 % . ( ) , a p . 10.1 , 0.01 % . 11.2.1.2 , (1 ms ). . 1 , m KS B 5325:2009 13 . , 0.01 % . 11.2.1.3 A 0 , . ( e s ) p C (3) A.1 2 A ( A.1) . (E s ) p 0.05 % . 11.2.1.4 , , . a) b) 8.5 , 0.5 . , . , ( e s ) d . (e s ) d . ( E s ) d 0.05 % . 11.2.2 11.2.2.1 5 , Students t ( D ) 95 % . 2 (, 2 .), ( e R ) b . ( E R ) b 0.1 % . . 11.2.2.2 KS B 5325:2009 14 . , 10 10 . , , 95 % , t 95 s( D ) . 6 . , . , 95 % , ( E R ) p . (E R ) p . (E R ) p . ( E R ) p 0.1 %
