Qaysi biri eng yuqori portlashdan himoyalangan

Portlashdan himoyalangan tasnif: IIC darajasi eng yuqori hisoblanadi, IIB va IIA ilovalarini o'z ichiga oladi; IIB reytingda IIA dan oshib ketadi.

Sinf va daraja	Yonish harorati va guruhi
-	T1	T2	T3	T4	T5	T6
-	T＞450	450≥T＞300	300≥T＞200	200≥T＞135	135≥T＞100	100≥T＞85
I	Metan
IIA	Etan, Propan, Aseton, Fenetil, Ene, Aminobenzol, Toluol, Benzol, Ammiak, Karbon monoksit, Etil asetat, Sirka kislotasi	Butan, etanol, Propilen, Butanol, Sirka kislotasi, Butil Ester, Amil asetat sirka angidridi	Pentan, Geksan, Geptan, Dekan, Oktan, Benzin, Vodorod sulfidi, Siklogeksan, Benzin, Kerosin, Dizel, Neft	Eter, Asetaldegid, Trimetilamin		Etil nitrit
IIB	Propilen, Asetilen, Siklopropan, Koks gazi	Epoksi Z-alkan, Epoksi propan, Butadien, Etilen	Dimetil efir, Izopren, Vodorod sulfidi	Dietileter, Dibutil efir
IIC	Suv gaz, Vodorod	Asetilen			Uglerod disulfidi	Etil nitrat

Maksimal sirt harorati: Bu elektr qurilmalari eng yomon belgilangan ish sharoitlarida erisha oladigan eng yuqori haroratga ishora qiladi, atrofdagi portlovchi atmosferani yoqishi mumkin. The maximum surface temperature must be lower than the flammable temperature.

Masalan; misol uchun: In environments where explosion-proof sensors are used, if the ignition temperature of the portlovchi gases is 100°C, then the maximum surface temperature of any component of the sensor must remain below 100°C.