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GBT39841-2021 超聲波燃氣表Ultrasonic gas meters測試灰塵
灰塵的規格
試驗采用 4 組不同尺寸的灰塵,每組中 95%的灰塵顆粒大小在下列相應尺寸范圍內
a) 0um~100 um;平均大小( 50士10)um;
b) 100 um~200 um;平均大小(150 士10) um;
c)200 um~300um;平均大小(250士10)um;
d) 300pm~400um;平均大小(350士10)um。
上述每一組灰塵的質量成分應是:
四氧化三鐵(Fe304) 79%;
三氧化二鐵(Fe203) 12%;
二氧化硅(Si0) 8%;
一油漆殘片 1%
EN 14236:2007(E)
Specification of contamination dust
Four separate batches of dust shall be used with 95 % of the particles in each batch in the appropriate size range given below:
a)0 um to 100 um Average size (50士10) um;
b) 100 um to 200 um Average size (150士10) um;
c) 200 um to 300 um Average size (250 士10) um;
d) 300 um to 400 um Average size (350士 10) um.
Each of the above batches shall have a composition by mass of:
Black iron oxide(Fe3O4) 79 %
Red iron oxide (Fe2O3) 12 %
Mineral silica flour (SiO) 8%
Paint residual flake 1%