Dust level (the first X)0: no protection1: to prevent large solid intrusion2: to prevent the invasion of solid medium size3: prevent small solid into intrusion4: prevent solid objects greater than the entry of 1mm5: to prevent the accumulation of harmful dust6: completely prevent dust enteringWaterproof grade (second X)0: no protection1: the drops into the shell had no effect2: when the shell is tilted 15 degrees, water droplets drops into the shell had no effect3: water or rain from 60 degrees corner to the housing no effect4: liquid from any direction poured into the shell did not damage effect5: rinse with water without any harm6: can be used for the cabin environment7: in a short time immersion resistant (1m)8: in the long time of soaking under certain pressureShell protection grade (IP code) standards:1) by IEC (INTERNATIONAL ELECTROTECHNICAL COMMISSION) the IEC: International Electrotechnical Commission Standard IEC 529 – 598; 2) GB GB 700 - 86; 3) GB 4208.Shell protection grade (IP code) laboratory:0：沒(méi)有保護(hù)1：防止大的固體侵入2：防止中等大小的固體侵入3：防止小固體進(jìn)入侵入4：防止物體大于1mm的固體進(jìn)入5：防止有害的粉塵堆積6：完全防止粉塵進(jìn)入防水等級(jí)(第二個(gè)X表示)0：沒(méi)有保護(hù)1：水滴滴入到外殼無(wú)影響2：當(dāng)外殼傾斜到15度時(shí)，水滴滴入到外殼無(wú)影響3：水或雨水從60度角落到外殼上無(wú)影響4：液體由任何方向潑到外殼沒(méi)有傷害影響5：用水沖洗無(wú)任何傷害6：可用于船艙內(nèi)的環(huán)境7：可于短時(shí)間內(nèi)耐浸水（1m）8：于一定壓力下長(zhǎng)時(shí)間浸水外殼防護(hù)等級(jí)（IP代碼）的標(biāo)準(zhǔn)有：1）由IEC（INTERNATIONAL ELECTROTECHNICAL COMMISSION）所起草國(guó)際防護(hù)和防水試驗(yàn)標(biāo)準(zhǔn)：國(guó)際電工委員會(huì)標(biāo)準(zhǔn)IEC 529 – 598；2）國(guó)標(biāo)GB 700 – 86；3）GB 4208等。外殼防護(hù)等級(jí)（IP代碼）實(shí)驗(yàn)室：