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首先，德國(guó)海?。℉ERION）電磁閥的防爆標(biāo)示EEx mdⅡCT6只是海隆公司產(chǎn)品隔爆的標(biāo)識(shí)而已，其中md在Herion是封裝后再隔爆的意思，即整個(gè)線圈先用環(huán)氧樹脂進(jìn)行澆封裹裝，再在外面加罩一層金屬防爆盒，4600系列為鋁合金的4800為不銹鋼的，整個(gè)線圈是用金屬外殼封裝一體式的。 其次，美國(guó)ASCO電磁閥的VCEF系列防爆標(biāo)示EEx mdⅡCT6，其中md在ASCO是澆封防爆的意思，即整個(gè)線圈先用環(huán)氧樹脂進(jìn)行澆封裹裝，再外接一個(gè)防爆接線盒，而這個(gè)線圈的核心部分其防護(hù)等級(jí)實(shí)際上為EEx mⅡT4，起隔爆作用的只是那個(gè)接線盒，但并沒有罩住線圈，也就是說(shuō)并不是真正的防爆電磁閥。 再次，其次美國(guó)ASCO電磁閥的VCEF系列是在上海生產(chǎn)的，并非美國(guó)或是歐洲的，而德國(guó)海隆（HERION）電磁閥全部是德國(guó)原裝的，其質(zhì)量和安全性能是遠(yuǎn)高于VCEF系列。也就是說(shuō)德國(guó)海隆電磁閥的EEx mdⅡCT6防爆等級(jí)是等同于美國(guó)ASCO電磁閥的EEx dⅡCT6防爆等級(jí)。美國(guó)ASCO電磁閥的NF和WSNF系列，是在線圈外面直接罩防爆接線盒的，這有別于HERION的先澆封后罩防爆接線盒的，即德國(guó)海?。℉ERION）全金屬封裝后的EEx mdⅡCT6 防爆等級(jí)高于美國(guó)ASCO末封裝的全金屬外殼EEx dⅡCT6 的。 后，要電磁閥是不是真真防爆的不僅僅要看防爆等級(jí)，還要看起線圈和接線盒的位置，如果是接線盒罩住線圈的就是真真防爆的，如果線圈外接了接線盒就是澆封的，只是外接了一個(gè)防爆接線盒而已。
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