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译者说明:本文节译自日本《计测与制御》1975年11月号刊载的《电磁流量计的进步与规格的现状(电磁流量计的进展和标准现状)》一文,第2.1.3节“在实际管道上流速分布影响”和第3节“关于JISZ8764—1975(日本标准《电磁流量计的流量测量方法》)”中有关电磁流量计流量值受各种前后接管影响的段落。中、小口径电磁流量变送器对上游前直管段的要求不是很高的,因为从变送器电极到导管进口的距离L已经有了几倍直径D的直管段。所以我厂生产的25、50、80毫米口径的变送器,L/D比值分别达8、5、3.5。我们曾
Translator’s Note: This article is translated from the Japanese “Measurement and Control” November 1975 issue of “electromagnetic flowmeter progress and specifications of the status quo (electromagnetic flowmeter progress and standard status quo”) article, Section 2.1.3 “Effect of Flow Velocity Distribution on Actual Pipes” and Section 3 “About JIS Z8764-1975 (Flow Measurement Method of Electromagnetic Flowmeter of Japanese Standard)”, paragraphs relating to the effects of various fore and aft flow rates on an electromagnetic flowmeter. Medium and small diameter electromagnetic flow transmitter upstream of the straight pipe section is not very demanding because the distance from the transmitter electrode to the catheter inlet L has several times the diameter of the D straight pipe. So I plant 25,50,80 mm caliber transmitter, L / D ratio of 8,5,3.5 respectively. We have