孔板流量计有无定型规格？ 板厚是选的，“5.1.5 thicknesses e and e 5.1.5.1 the thickness e of the orifice shall be between 0,005d and 0,02d. 5.1.5.2 the difference between the values of e measured at any point on the orifice shall not be greater than 0,001d. 5.1.5.3 the thickness e of the plate shall be between e and 0,05d. however, when 50 mm u d u 64 mm, a thickness e up to 3,2 mm is acceptable. it shall also meet the requirements of 5.1.2.3. 5.1.5.4 if d w 200 mm, the difference between the values of e measured at any point of the plate shall not be greater than 0,001d. if d 200 mm, the difference between the values of e measured at any point of the plate shall not be greater than 0,2 mm. ” 开孔直径是算出来的，有讲究 详见iso5167-2查看更多
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