1、 Preparation before operation
1. Equipment and environmental inspection
Confirm that there are no leaks or blockages in the power and gas supply pipelines, and that the pressure gauge is functioning properly; Clean up debris in the work area and hang warning signs to maintain a dry and clean environment.
Avoid high temperature/high humidity environments and strictly prohibit operations near flammable materials (such as when using PAO/DOP aerosols).
2. Personnel protection
Operators must wear goggles and particulate matter masks, and wear protective gloves when exposed to high-pressure gases.
3. Equipment compatibility
Check the compatibility between the tester model and the filter specifications (filter area, material) to ensure that the parameter setting range meets the equipment calibration values.
2、 Test Execution Specification
1. Connection and parameter settings
Securely connect the filter and tester interface to ensure sealing; Select the testing mode based on the characteristics of the filter element (bubble point method/diffusion flow method/water intrusion method).
Key parameter limitations: The diffusion flow method requires testing pressure to be ≤ 80% of the bubble point value, while the water intrusion method requires water injection to completely cover the highest point of the filter element.
2. Process monitoring
Real time monitoring of pressure gauge and data changes after startup, with scanning speed strictly controlled within ≤ 5cm/s; It is strictly prohibited to operate beyond the limit (pressure/flow rate must not exceed the equipment calibration range).
Immediately interrupt testing and investigate the cause of any abnormalities (such as sudden drops or increases in pressure).
3、 Risk control and emergency measures
1. Pressure safety
Ensure that the system withstand voltage value is greater than the maximum measured bubble point during bubble point testing; Personnel should avoid connecting parts during high-voltage operation.
2. Reagents and Leakage Handling
Only use designated testing media (such as isopropanol, PAO), and prohibit other chemicals; Small leaks (<3%) should be repaired with specialized sealant, while large leaks should be immediately stopped and replaced.
4、 Maintenance requirements
1. Daily maintenance
Clean the surface of the instrument after testing, and regularly clean the nozzle of the cold aerosol generator to prevent clogging.
2. Regular calibration
Calibrate pressure sensors and flow meters monthly, replace filter elements/clean membrane surfaces quarterly, and promptly replace worn seals.