DFE 多次通過(guò)測(cè)試方法
DFE 多次通過(guò)測(cè)試方法提高了工業(yè)標(biāo)準(zhǔn),其通過(guò)引入動(dòng)態(tài)條件下的負(fù)載循環(huán)并測(cè)量在該
負(fù)載條件下的實(shí)時(shí)動(dòng)態(tài)條件結(jié)果而不是取平均值。DFE 同時(shí)也指明實(shí)時(shí)的截留率，以前濾芯
不能正確截留污染物能得到證實(shí)。釋放截留污染現(xiàn)象被稱為卸載，使關(guān)鍵系統(tǒng)受到短時(shí)污染。
DFE 測(cè)試時(shí)循環(huán)的條件跟 ISO16889 相似，但流速不是常數(shù)，DFE 通過(guò)控制流量的變化
來(lái)保持系統(tǒng)滿流量通過(guò)濾芯。顆粒計(jì)數(shù)器一直保持計(jì)數(shù)顆粒，而計(jì)數(shù)器之前中間沒(méi)有油槽，
這樣確保測(cè)試的污染度是真實(shí)的。
每次流量變化之前、之中和之后計(jì)數(shù)器都進(jìn)行工作，過(guò)濾效率也是采用 Beta 值，過(guò)濾百
分比和每毫升的實(shí)際顆粒數(shù)表示。在正確時(shí)間和不同流量情況下進(jìn)行快速顆粒計(jì)數(shù)的 DFE 測(cè)
試使 Hy-Pro 公司分析和明白每種濾芯的捕獲效率和留存率的特點(diǎn)。
DFE 測(cè)試方法—定量濾芯截留率和留存率
同一生產(chǎn)廠家兩種相同
的高效玻纖濾芯的性能，其中一個(gè)是根
據(jù) ISO16889 多次通過(guò)測(cè)試，另外一個(gè)是
根據(jù) DFE 多次通過(guò)測(cè)試方法、圖表表示
濾芯在測(cè)試時(shí)下 6µ[C]顆粒的實(shí)際數(shù)量。
A2 濾芯是在額定流量和保持穩(wěn)定
的過(guò)濾效率的測(cè)試，A1 濾芯是在
流量與最小流量之間循環(huán)測(cè)試。這樣 A1 的
下游的顆粒是變化的，并且在從最小到
流量時(shí)顆粒數(shù)為。峰值代表
流量變化時(shí)的顆粒數(shù)，峰谷代表每次流量
變化后的顆粒數(shù)，變化的峰值代表流量從
低到高的變化。當(dāng) A1 濾芯攔截的污染物增
加，同時(shí)流量從低到高時(shí)下游的顆粒數(shù)量增
加。因此 A1 濾芯沒(méi)有達(dá)到正確設(shè)計(jì)時(shí)污染
物的留存率，這將會(huì)是危險(xiǎn)的污染源。
A1 濾芯在從低流量到高流量變化時(shí)上游和下游的原始顆粒數(shù)，A1 濾芯在
從低流量到高流量變化時(shí)的顆粒數(shù)。下游的顆粒數(shù)可以表明流量變化時(shí)大量的的大顆粒在動(dòng)態(tài)條
件下沒(méi)有通過(guò)濾芯，這種現(xiàn)象稱之為“污染物卸載”。當(dāng)濾芯截留更多污染物時(shí)，更多數(shù)量的污染
物將被釋放回系統(tǒng)。卸載也可能發(fā)生在流速?gòu)母叩降偷淖兓闆r下，在動(dòng)態(tài)條件下濾芯能短暫恢
復(fù)，但污染物卸載能引起流體的高污染，使系統(tǒng)遭受破壞和系統(tǒng)性能不可靠。
濾芯 A1 A2
過(guò)濾比效率 β7[C] ＞1000 β7[C] ＞1000
高流量 112 112
低流量 56 -
污染物 （注入率） 3mg/1 3mg/1
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