Basic Principles of Testing Technology
1. Differential pressure testing method is used, establishing a pressure comparison between the sealed test environment and a standard reference chamber.
2. Utilizing the gas compression characteristics, when the tested part has a leak, the system pressure will continuously decrease.
3. High-precision pressure sensors can detect pressure changes at the 0.1Pa level.
Core Components of the Testing System
1. Dual-chamber testing device: Includes a test chamber and a reference chamber, using aerospace-grade sealing materials.
2. Data acquisition module: Integrates a 24-bit AD converter, with a sampling frequency of up to 100Hz.
3. Intelligent control system: A gas path control unit with PID adjustment function.
4. Industrial computer: Runs dedicated analysis software, supporting SPC statistical analysis.
Standardized Testing Process
1. Sample pretreatment: Clean the surface and install a dedicated sealing fixture.
2. System calibration: Perform zero-point calibration and full-scale calibration.
3. Test parameter setting: Set the pressure value and holding time according to the workpiece volume.
4. Automatic Test Execution: The system completes the pressurization-stabilization-testing cycle according to a preset program.
5. Result Judgment: Automatically generates pass/fail conclusions based on industry standards.
Key Quality Control Points
1. Ambient temperature fluctuations must be controlled within ±1℃.
2. Regularly calibrate the pressure sensor accuracy to ensure measurement error <0.5%FS.
3. Seal replacement cycle should not exceed 2000 tests.
4. Test reports should include complete data such as pressure curves and leakage rates.
Safe Operating Procedures
1. Test pressure must not exceed 80% of the equipment's rated value.
2. Equip with a safety relief device and pressure interlock protection system.
3. Operators must obtain pressure vessel operation qualifications.
