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污染等级参考这个:
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https://www.myomron.com/index.php?action=kb&article=5133 }3 Y8 n, {; `+ M( h
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Pollution Degree 1 : No pollution or only dry non-conductive pollution. It has no effect. Clean room environments, Inside sealed components) p5 a( Z. l8 @0 a# c! ?2 M) Y
8 _5 R+ H/ d* j( U# s+ u( M
Pollution Degree 2: Normally only non-conductive pollution. Temporary Condensation possible. Offices, laboratories, test stations
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4 D9 Z* _1 }# K. Y- z9 S; z/ oPollution Degree 3: Conductive and non-conductive pollution present. Condensation frequent. Industrial & farming areas (under cover), unheated rooms, Boiler rooms
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Pollution Degree 4: Pollution generates persistent conductivity caused by wet dust, rain or snow. Outdoor use, remote stations
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F$ ]6 E: R2 H0 e7 X+ [( O2 P. C# b
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材料类别 (Material group) 在 6.13:
3 [% |! m/ ~1 K* @) F% h6.13.1 – material of material group IIIb with a PTI of 100 and up to but excluding 175;
& A h0 c2 W l( [5 |. ?6.13.2 – material of material group IIIa with a PTI of 175 and up to but excluding 400;
, y; ?2 q% x) ~- v( S6.13.3 – material of material group II with a PTI of 400 and up to but excluding 600;
7 ` j' o C1 K# A4 b6.13.4 – material of material group I with a PTI of 600 and over.7 C; ^ K) _) {- k, n, M: g2 }; d
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发表于 2018-12-7 16:51
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发表于 2018-12-7 18:08