The following is the operation method of the online vacuum attenuation leak detection machine, based on the principle of vacuum attenuation method and equipment operation specifications:
1、 Equipment preparation stage
1. System connection
Connect the power supply of the leak detector to the compressed air source to ensure the normal operation of core components such as the vacuum pump and sensors.
Check the sealing of the testing chamber and vacuum pipeline to avoid misjudgment caused by interface leakage.
2. Sample pretreatment
Clean the surface of the test container to ensure that there are no impurities interfering with the test results.
Select the appropriate fixture based on the container size and fix it in the dedicated workstation inside the testing chamber.
2、 Parameter settings
1. Basic parameter setting
Set the vacuum degree (usually -80kPa to -90kPa), holding time (10-30 seconds), and testing time (5-60 seconds) on the control panel. The specific values need to be adjusted according to the container material (such as glass ampoules, plastic packaging).
For flexible packaging, it is necessary to appropriately reduce the vacuum degree to prevent deformation.
2. Calibration verification (optional)
Use standard samples with known leakage rates for calibration, compare test results with standard values, and adjust sensor sensitivity or compensation parameters.
3、 Test execution process
1. Vacuum pumping stage
Start the equipment and use the vacuum pump to evacuate the test chamber to the set value. If the target vacuum level cannot be reached within the predetermined time, it will be judged as a major leak (such as a rupture or seal failure).
2. Pressure holding stage
The system enters a pressure holding state and continuously monitors pressure changes. If the pressure rises above the threshold, it indicates a leak (such as micropores or inadequate sealing).
3. Testing phase
During the testing period, record the vacuum decay rate using a high-precision pressure sensor. If the attenuation rate exceeds the reference value, it is judged as micro leakage (such as pinhole or material penetration).
4、 Result processing and maintenance
1. Data recording and analysis
The system automatically generates pressure change curves and leakage reports, and supports exporting data for quality traceability.
Mark and isolate the non-conforming samples, and further analyze the leakage location (such as using bubble observation method to assist in localization).
2. Equipment maintenance
Clean the testing chamber after daily testing and regularly replace the vacuum pump oil and sensor filter element.
3. Key precautions
Environmental control: To avoid temperature and humidity fluctuations affecting test accuracy, it is recommended to operate in a constant temperature and humidity environment.
Compatibility verification: For special materials (such as freeze-dried powder injection bottles), it is necessary to verify the compatibility between equipment parameters and samples in advance.
Through the above steps, efficient and non-destructive online sealing testing can be achieved, meeting the stringent requirements for packaging integrity in industries such as pharmaceuticals and food.