Qhov chaw tawg-pov thawj yog DIIBT4

Lub npe dIIBT4 yog hais txog Chav Kawm II, Qeb B explosion-proof rating.

II	B	T4	Gb	IP64
Kuv Kuv	Methane	T1450 ℃	Ma Kev tiv thaiv siab heev	IP64
		T2 300 ℃
			Mb Kev tiv thaiv qib siab
		T3 200 ℃
Kuv Nto Khoom	Propane		Ga Kev tiv thaiv siab heev
		T4 135 ℃
	Ethylene		Gb Kev tiv thaiv qib siab
		T5 100 ℃
	Hydrogen, Acetylene		Gc Kev tiv thaiv qib dav dav
		T6 85 ℃

Lub prefix 'd’ txhais tau hais tias ib hom flameproof ntawm enclosure, tsim kom muaj kev tawg hauv ib qho tsis muaj kev puas tsuaj rau lub qhov rooj thiab tiv thaiv kev sib kis ntawm kev tawg sab nraud;

IIB qhia cov qeb ntawm cov roj siv;

T4 txhais tau hais tias qhov khoom ntawm qhov siab tshaj plaws kub tseem nyob hauv qab 130 ° C.