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污染等级参考这个:: r! F0 k8 H$ R X' g
3 o/ E9 T5 U8 A; v" ohttps://www.myomron.com/index.php?action=kb&article=5136 i$ W" e0 p' n. A. \# H0 K
3 O8 q' o, [( y, C9 S1 sPollution Degree 1 : No pollution or only dry non-conductive pollution. It has no effect. Clean room environments, Inside sealed components, y7 s- N3 L" c/ c( e
5 N$ ^4 ?5 B9 Q% F7 q' B/ E% w" G1 E/ iPollution Degree 2: Normally only non-conductive pollution. Temporary Condensation possible. Offices, laboratories, test stations
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Pollution Degree 3: Conductive and non-conductive pollution present. Condensation frequent. Industrial & farming areas (under cover), unheated rooms, Boiler rooms6 V4 P( A: E% M" u& j
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Pollution Degree 4: Pollution generates persistent conductivity caused by wet dust, rain or snow. Outdoor use, remote stations% R5 b. Q3 Y) f. Q3 g
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: P: J$ R% y- a% E9 o: t材料类别 (Material group) 在 6.13:
1 w9 |% M8 Q& S- [$ N6.13.1 – material of material group IIIb with a PTI of 100 and up to but excluding 175;& C k; w9 u$ C1 X2 ?# e# O; z
6.13.2 – material of material group IIIa with a PTI of 175 and up to but excluding 400;: w) N- \. R$ n
6.13.3 – material of material group II with a PTI of 400 and up to but excluding 600;
1 {, q w: `3 Y( l6.13.4 – material of material group I with a PTI of 600 and over./ J+ x4 `0 Q9 \5 S9 }# A
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