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污染等级参考这个:, m) m( p% f0 k7 n, Y# B
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https://www.myomron.com/index.php?action=kb&article=513
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7 E3 [+ A. U: Y3 q+ |6 d1 J4 k hPollution Degree 1 : No pollution or only dry non-conductive pollution. It has no effect. Clean room environments, Inside sealed components, f6 o4 d* [3 m2 ?: R7 S8 r
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Pollution Degree 2: Normally only non-conductive pollution. Temporary Condensation possible. Offices, laboratories, test stations8 v0 H* U2 f. f! o7 @+ E& E L: Y
9 k5 K3 z/ r8 u6 dPollution Degree 3: Conductive and non-conductive pollution present. Condensation frequent. Industrial & farming areas (under cover), unheated rooms, Boiler rooms$ J" q% e& I; D1 t- c9 T7 T
' y8 k% a7 N) o n0 e9 ]Pollution Degree 4: Pollution generates persistent conductivity caused by wet dust, rain or snow. Outdoor use, remote stations
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% o1 P9 X+ i- `% B, l8 Z. j; k2 H材料类别 (Material group) 在 6.13:! z1 [) _% p# a) _+ C
6.13.1 – material of material group IIIb with a PTI of 100 and up to but excluding 175;
( H/ k" b$ A9 E' G: s6.13.2 – material of material group IIIa with a PTI of 175 and up to but excluding 400;, `1 C0 ?3 x L7 G& Y5 e
6.13.3 – material of material group II with a PTI of 400 and up to but excluding 600;
, [3 p+ s# l" V" r6.13.4 – material of material group I with a PTI of 600 and over.
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发表于 2018-12-7 16:51
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发表于 2018-12-7 18:08