JJG640-1994差压式流量计检定规程.pdf

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1、差压式流量计检定规程JJG640-1994‘卜·今·心户一卜·幸，卜卜·卜一找v·冷JJG641卜一1994丫差压式流遥计检定规程、令代替JJG267-1982冬，JJG311-1983rVerificationRegulationof??1JG271-1984,rDifferentialPressure7沙pe今JJG621-19892-·冷Flowmeter从JJG641】一1990.、.:一，卜.、，;..今.卜._卜声本检定规程经国家技术监督局于1994年07月12日批准，并自1994年12月of日起施行归口单位:北京市技术监督局起草单

2、位:中国计量科学研究院北京市计量测试所本规程技术条文由起草单位负责解释本规程主要起草人:翟秀贞(中国计量科学研究院)谢纪绩(北京市计量测试所)杨希文(北京市计量测试所)参加起草人:彭淑琴(上海工业自动化仪表研究所)童复来(天津市自动化仪表十厂)王建民〔北京市计量测试所)张吉星(泊头市仪表厂)鞠庆长(银河仪表厂)于志林(大连精工仪表厂)1278目录一概述···························································································⋯⋯1280二

3、技术要求·............................................................................................1281(一)几何检验法···········································································⋯⋯1281(二)系数检定··············································································

4、⋯⋯1295(三)差压计或差压变送器····································，···························，⋯⋯1296三检定条件·............................................................................................1297(一)几何检验法·······················，····················································

5、⋯⋯1297(二)系数检定··············································································⋯⋯1297(二)差压计或差压变送器·································································⋯⋯1297四检定项目和检定方法·.............................................................................1298(一)

6、儿何检验法··············································································⋯⋯1298(二)系数检定·················，，·····，························································⋯⋯1304(三)差压计或差压变送器·················································，················⋯⋯1307五检定结果处理和

7、检定周期·.......................................................................1309附录································································································⋯⋯1312附录1差压信号管路的敷设方法及其安装原则··········································⋯⋯1312附录2节流件的主要参数·...........

8、..............................·················，······⋯⋯1318附录3管壁等效绝对粗糙度K值·