Filter leak test case and Application

In the clean room, the filter is the key equipment to achieve high cleanliness air purification Therefore, after the filter is installed or replaced, the installation connection of the filter must be checked for leakage to ensure that the cleanliness of the clean room meets the requirements 1、 The instrument accurately detects the quality of the filter to avoid the filter leakage and affect the production Methods: dust particle count was used to detect whether the filter had leakage Results: if the suspended particles of each point exceed the range required by the clean area, there will be leakage, which needs to be plugged or replaced Dust particle counter 2 The principle of experiment is based on the principle of light scattering When counting and measuring, the photomultiplier tube is used to receive the light reflected by dust particles to measure its size and quantity, and to analyze, accumulate and display the data 3、 Test method 3.1 environmental conditions: the temperature is controlled at 18-26 ℃; the relative humidity is controlled at 45-65% 3.2 test state: static test, no more than two indoor testers 3.3 pressure difference: for rooms with different cleanliness, the static pressure difference is 5pa, and the static pressure difference between clean area and non clean area is 10Pa; for rooms with large amount of dust produced in the process, the relative negative pressure shall be maintained between other rooms 3.4 test method 3.4.1 wipe the dust particle counter with water for injection and 75% alcohol for disinfection, and then pass it into the clean area after ultraviolet irradiation for 30 minutes 3.4.2 place the dust particle counter horizontally on the table The measuring plastic pipe port is connected to the filter nozzle 3.4.3 turn on the power After TL inspection and selection, pull the measuring plastic pipe off the back panel When the port is placed at the position to be measured, 3.4.4 when testing, the sampling head is 2-4atl away from the filter, scan slowly along the inner frame and the middle of the filter, and test 5 points less for each filter, and observe the displayed data After the test, connect the sampling plastic pipe port to the back panel of the dust particle counter for TL inspection Then turn off the power See table 1.4 for the results of filter in Grade 100 clean area measured by dust particle counter Conclusion through the above measurement, it can be seen that filter 3 has leakage Leakage plugging or replacement is required, and the filter must be retested after repair or replacement Under normal conditions, the filter is generally tested for leakage once a year to see if there is any change It is an important part of cleanliness test Shanghai Sujing Industry Co., Ltd if you have any need, you can pass with us at any time Thank you very much for your support and look forward to cooperating with you Thank you & bestragard! Suing Jinghua