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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=513
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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
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9 q p) O" s! \ S! [7 A! UPollution Degree 2: Normally only non-conductive pollution. Temporary Condensation possible. Offices, laboratories, test stations' I7 s; }$ Q0 f4 q$ ] V
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Pollution Degree 3: Conductive and non-conductive pollution present. Condensation frequent. Industrial & farming areas (under cover), unheated rooms, Boiler rooms/ Q2 `* Q- ]5 N2 \1 b' M
/ R# @# L5 E: y; HPollution Degree 4: Pollution generates persistent conductivity caused by wet dust, rain or snow. Outdoor use, remote stations6 V, `; ]( J5 i
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. f8 @$ f' P4 L5 i0 b材料类别 (Material group) 在 6.13:1 O9 q4 J- Z- P: w" D
6.13.1 – material of material group IIIb with a PTI of 100 and up to but excluding 175;" n. P n, j7 s
6.13.2 – material of material group IIIa with a PTI of 175 and up to but excluding 400;( a) a! A( J0 q9 d
6.13.3 – material of material group II with a PTI of 400 and up to but excluding 600;& c, F' x) l; z- G% r( V, ~
6.13.4 – material of material group I with a PTI of 600 and over.. d9 X; l: R+ D7 c9 U* g, x
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