DFE 多次通過測試方法

DFE 多次通過測試方法提高了工業(yè)標(biāo)準(zhǔn),其通過引入動(dòng)態(tài)條件下的負(fù)載循環(huán)并測量在該

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 測試時(shí)循環(huán)的條件跟 ISO16889 相似，但流速不是常數(shù)，DFE 通過控制流量的變化

來保持系統(tǒng)滿流量通過濾芯。顆粒計(jì)數(shù)器一直保持計(jì)數(shù)顆粒，而計(jì)數(shù)器之前中間沒有油槽，

這樣確保測試的污染度是真實(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，過濾效率也是采用 Beta 值，過濾百

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

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 多次通過測試，另外一個(gè)是

根據(jù) DFE 多次通過測試方法、圖表表示

濾芯在測試時(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

的過濾效率的測試，A1 濾芯是在

流量與最小流量之間循環(huán)測試。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

件下沒有通過濾芯，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)生在流速從高到低的變化情況下，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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