How to know the service life of filter through leak detection?

1、 The service life of the filter 1 According to the monitoring procedures formulated by the company, regularly monitor the air cleanliness of the clean workshop In case of any abnormal situation, if the filter is considered as a problem, it should be replaced, such as 70% reduction of air supply, leakage, etc 2 According to the verification requirements of air conditioning purification system, it shall be verified regularly and replaced as required in case of any abnormal condition 3 When abnormal conditions are found in the normal production process, such as unqualified differential pressure, no air supply, etc., the filter shall be replaced when the cause Zui is analyzed and determined to be a filter problem 4 Replacement cycle specified in the company's documents: generally, factors such as production volume and dust production shall be considered 2、 The test method of filter leakage is dust particle counter method: generally small sampling instruments such as 2.83l/min are used, and the limit specified by dust particle count method is taken as the judgment standard, or obvious particle number change is found Operation method: the sampling port is 23cm away from the filter, and the moving speed is 520mm / s DOP or Pao method Use instruments: smoke generator, leak detector Methods: the distance between the sampling head of the receiver and the filter was about 2cm, and the inspection speed was within 2 ~ 3cm / s Standard: the leakage rate shall be less than 99.99% Filter leakage detection 1 Purpose: to detect the leakage of the filter and find the defects of the filter and its installation, so as to take remedial measures in time 2 Scope: applicable to the leakage detection of filter in clean area 3 Responsible person: quality department, production department 4、 Procedures: (1) test method: dust particle count scanning inspection method (2) Test range: filter material, sealing of filter frame, connection between filter group support frame, connection between support frame and fixed wall (3) Detector: dust particle counter (4) Detection principle: according to the principle of light flux which is proportional to the particle size scattered by floating particles under certain intensity of light, the scattered light of particles is converted into electrical signal through photoelectric conversion, and the equivalent diameter of particles and the number of corresponding particles are displayed after amplification and computer processing (5) Detection procedure: (a) the dust particle counter sampling head is used to scan the air outlet side of the filter, the distance between the sampling head and the filter is about 2cm, and the scanning speed is less than 5cm / s along the inner frame of the filter (b) When the detection period is 10min, the particle number of 0.5u m is more than 20, indicating that the leakage exceeds the standard and needs to be repaired or replaced (c) After plugging or fastening the bolt with epoxy resin glue, carry out scanning inspection (6) Test cycle: test once less every year in normal use, and the newly installed filter shall be tested Check the pressure difference at the two ends of the filter once a year When the pressure difference reaches three times of the initial resistance value, it shall be replaced; when the air flow speed drops to the low limit of Zui, even if the secondary efficiency filter cannot be increased after replacement, it shall be replaced; when the air volume of the air filter is 70% of the original air volume, it shall be replaced; when the air filter has leakage that cannot be repaired, it shall be replaced 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