濾芯擴散流完整性測量儀   測試功能

泡點孔徑、氣體滲透性、濾芯及設(shè)備完整性、折疊濾芯擴散流、耐壓測試等。

 

濾芯擴散流完整性測量儀   技術(shù)參數(shù)

外形尺寸(mm)	390?370?170		工作介質(zhì)	壓縮空氣、鋼瓶氣
壓力量程(kPa)	50	600	流量量程	20	30
壓力顯示精度(kPa)	0.01	0.1	流量顯示精度(L/min)	0.1
工作壓力(bar)	0 ~ 6		氣源壓力(bar)	2.4~8.3
氣源接口(mm)	6		出氣接口(mm)	8
電壓(V)	220		重量(kg)	5

 

孔徑測量范圍

潤濕劑	表面張力（mN/m）	孔徑測試范圍(μm)
去離子水	72.8	0.4 ~ 500
GQ–20	20	0.1 ~ 100
乙醇	22.3	0.1 ~ 100
GQ–16	16	0.1 ~ 100

 

 

 

參考標準：

GB/T5250-1993 可滲透燒結(jié)金屬材料流體滲透性的測試

GB/T 1969-1996 多孔陶瓷滲透率試驗方法

 

 

BQS-19 型測試儀采用 5.7″帶背光數(shù)字液晶顯示屏；中文菜單及提示，實時顯示測試數(shù) 據(jù)和曲線，并可打印測試結(jié)果及測試曲線，以便監(jiān)控測試全過程，幫助分析濾膜及過濾系統(tǒng)的性 能；機內(nèi)大容量存貯空間，可存貯 50 組測試結(jié)果及 50 組測試參數(shù)。過濾器完整性的全部操作測 試過程僅在過濾器的上游進行，對過濾器的下游無污染，尤其適用于除菌過濾器的檢測。 

    此測試儀可廣泛運用于醫(yī)藥、生物工程、食品飲料、微電子等行業(yè)，也是過濾器制造商進 行過濾器檢測的常規(guī)儀器。 

 

 

 

 測試原理 1.1   氣泡點法 

    當多孔膜材料被合適的浸潤液完全濕潤后，由于液體的表面張力和相應(yīng)毛細管張力的作用， 浸潤液充滿膜孔并駐留在孔中。在濾材的兩側(cè)加上氣體壓差，要克服毛細管壓力將孔道中的液體 趕走而冒出氣泡，氣體的壓差必須增大到某一值?P，這個壓差值就稱為氣泡點，其計算公式如 式 1。式 1 表明，孔徑愈小，氣泡點愈高，因此可以用氣泡點來檢測過濾器的性能。 

          ?P=K4σ cosθ / D                                                                                                    （ 式 1）

其中：  ?P—壓差（達因/厘米 2），氣泡點值

σ—浸潤液的表面張力（達因/厘米） 

θ—濾膜與浸潤液的接觸角 

D—孔徑（厘米） 

K—孔形系數(shù)（因為真實的濾膜上的孔不是圓柱形） 

1.2   保壓法（壓力衰減） 

       濾材被液體（濕潤液）浸潤后，在濾材的兩側(cè)加上氣體壓差，并使濾材上游成為一個密閉 的氣壓腔，所加的壓差值略小于濾材的氣泡點（一般設(shè)定在氣泡點的 80%），這時氣體不能在濾 材的毛細孔中直接流通，但氣體分子可以通過毛細孔中的液體擴散至下游，這種由于氣體擴散而 形成的氣體流量稱為擴散流。由于氣體的擴散，濾材上游的壓力將衰減，衰減值的大小和濾材的 過濾性能形成對應(yīng)關(guān)系，因此測得一定時間內(nèi)的壓力衰減值就能判斷過濾器的性能。 

1.3   擴散流 

擴散流與壓力衰減值之間存在以下對應(yīng)關(guān)系： 

             D =??P V / T?Pa                                                                                                 （式 2）

其中：D—擴散流值  （毫升/分 ml/min） 
?P—壓力衰減值（mbar） 

V—上游體積（毫升 ml） 

T—測試時間（分 min） 

Pa—大氣壓力（1013 mbar） 

    測得一段時間內(nèi)的壓力衰減值，再測得上游封閉體積后，通過以上公式就可計算得出擴散流值。

1.4   水侵入保壓法 

    這種方法是為測試疏水型筒式濾芯所設(shè)計的。目前用前幾種方法測試時，對此類濾芯都使 用醇類浸潤濾膜。由于醇類的使用會帶來健康和可燃性引起的安全性問題，而用水浸入法測試時 只使用去離子水/注射用水（DI/WFI）級別的水，且濾膜不會被濕透，意味著在原理上這是一種 極具吸引力的測試方法。 

水侵入保壓法的原理是在干燥清潔的疏水性膜上加上水壓，表面張力和毛細管張力使水被 排斥，當逐漸升高壓力到一定值，水被壓過膜上最大孔，此壓力值被稱為水侵入壓力， 當所加水壓略低于水侵入壓力值，并隔絕上游體積，保持一定時間，使系統(tǒng)穩(wěn)定，然后測量壓力衰減值，將測量值與規(guī)定值比較就能判斷濾器的完整性，這種方法稱為水侵入保壓法。 

水侵入壓力值與膜的孔徑、膜的疏水性、水的純度、水的溫度、膜的潔凈度、膜的干燥度等有關(guān)，影響的因素較多，在實踐中要實現(xiàn)這種測試的重現(xiàn)性是很困難的。因此這種方法可作濾 器的粗檢，如果水侵入保壓法通過，濾器可以使用，如果通不過則用擴散流或保壓法進一步進行 驗證。 

若需進一步的技術(shù)支持，請與本公司聯(lián)系。 

Testing function

Bubble point aperture, gas permeability, filter and equipment integrity, folded filter diffusion flow

Voltage withstand test, etc.

 

technical parameter

Dimensions (mm) 390 ? 370 ? 170 Working medium Compressed air, steel cylinder gas

 

Pressure range (kPa) 50 600 Flow range 20 30

Pressure display accuracy (kPa) 0.01 0.1 Flow display accuracy (L/min) 0.1

Working pressure (bar) 0~6 Gas source pressure (bar) 2.4~8.3

Air source interface (mm) 6 Air outlet interface (mm) 8

Voltage (V) 220 Weight (kg) 5

 

Aperture measurement range

Wetting agent surface tension (mN/m) pore size testing range (μ m)

Deionized water 72.8 0.4~500

GQ–20 20 0.1 ~ 100

Ethanol 22.3 0.1~100

GQ–16 16 0.1 ~ 100

 

 

 

Reference standards:

GB/T5250-1993 Test for fluid permeability of permeable sintered metal materials

GB/T 1969-1996 Test Method for Permeability of Porous Ceramics

 

 

The BQS-19 tester adopts a 5.7 "backlit digital LCD display screen; Chinese menu and prompts, real-time display of test data and curves, and printing of test results and curves for monitoring the entire testing process, helping to analyze the performance of filter membranes and filtration systems; The large capacity storage space inside the machine can store 50 sets of test results and 50 sets of test parameters. The entire operation testing process for filter integrity is only carried out upstream of the filter, with no contamination downstream of the filter, especially suitable for the detection of sterilization filters.

This tester can be widely used in industries such as medicine, biotechnology, food and beverage, microelectronics, etc. It is also a conventional instrument for filter manufacturers to conduct filter testing.

 

 

 

Testing principle

1.1 Bubble Point Method

After the porous membrane material is completely wetted by a suitable wetting solution, the wetting solution fills the membrane pores and resides in them due to the surface tension of the liquid and the corresponding capillary tension. Adding a gas pressure difference on both sides of the filter material, in order to overcome capillary pressure and drive away the liquid in the channel, bubbles must emerge. The gas pressure difference must increase to a certain value ? P, which is called the bubble point. The calculation formula is shown in Equation 1. Equation 1 indicates that the smaller the aperture, the higher the bubble point, so bubble points can be used to detect the performance of the filter.

? P=K4 σ cos θ/D (Equation 1)

Among them: ? P - pressure difference (dynes/cm2), bubble point value

σ - surface tension of wetting solution (dynes/cm)

θ - Contact angle between filter membrane and infiltration solution

D - Aperture (cm)

K - Pore shape coefficient (because the pores on real filter membranes are not cylindrical)

1.2 Pressure holding method (pressure attenuation)

After the filter material is wetted by a liquid (wetting solution), a gas pressure difference is applied on both sides of the filter material, and a closed pressure chamber is formed upstream of the filter material. The pressure difference applied is slightly smaller than the bubble point of the filter material (usually set at 80% of the bubble point). At this time, gas cannot directly flow through the capillary pores of the filter material, but gas molecules can diffuse downstream through the liquid in the capillary pores. This gas flow rate formed by gas diffusion is called diffusion flow. Due to the diffusion of gas, the pressure upstream of the filter material will decay, and the magnitude of the decay value corresponds to the filtering performance of the filter material. Therefore, measuring the pressure decay value over a certain period of time can determine the performance of the filter.

1.3 Diffusion flow

There is a corresponding relationship between diffusion flow and pressure attenuation values as follows:

D =??P V / T?Pa                                                                                                 （Equation 2)

Among them: D - diffusion flow value (ml/min)

? P - pressure attenuation value (mbar)

V - Upstream volume (milliliters/ml)

T - Test time (minutes)

Pa - Atmospheric pressure (1013 mbar)

After measuring the pressure attenuation value over a period of time and measuring the upstream enclosed volume, the diffusion flow value can be calculated using the above formula.

1.4 Water intrusion pressure holding method

This method is designed for testing hydrophobic cylindrical filter cartridges. Currently, when testing with the previous methods, alcohol impregnated filter membranes are used for this type of filter element. Due to the health and safety concerns caused by the use of alcohols, the water immersion method only uses deionized water/injection water (DI/WFI) grade water for testing, and the filter membrane is not soaked, which means that in principle, this is an extremely attractive testing method.

The principle of the water intrusion pressure holding method is to apply water pressure, surface tension, and capillary tension to a dry and clean hydrophobic membrane to repel water. When the pressure gradually increases to a certain value, water is pressed through the maximum hole on the membrane, and this pressure value is called the water intrusion pressure. When the added water pressure is slightly lower than the water intrusion pressure value, the upstream volume is isolated and maintained for a certain period of time to stabilize the system. Then, the pressure attenuation value is measured, and the measured value is compared with the specified value to determine the integrity of the filter. This method is called the water intrusion pressure holding method.

The water intrusion pressure value is related to the pore size, hydrophobicity, purity, temperature, cleanliness, and dryness of the membrane. There are many influencing factors, and it is difficult to achieve reproducibility of this test in practice. Therefore, this method can be used for rough inspection of filters. If water invades and passes through the pressure holding method, the filter can be used. If it fails, diffusion flow or pressure holding method can be used for further verification.

If further technical support is needed, please contact our company.

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