The following is a related explanation of the influencing factors of the positive pressure sealing tester:
1、 Equipment hardware performance
1. Pressure sensor accuracy: As the core detection unit, high-precision sensors can accurately capture small pressure changes and effectively identify subtle leaks. If the accuracy of the sensor is insufficient, it may lead to missed detection or misjudgment.
2. Sealing of the pneumatic system: If there is leakage in the pneumatic pipeline, joints, valves and other components, it will directly affect the stability and accuracy of the test results. High quality gas path design must ensure no external leakage interference.
3. Stability of pressurization device: The performance of built-in diaphragm liquid pump and other pressurization components determines the smoothness of pressure output. Excessive pressure fluctuations can lead to deviation in test results.
2、 Test parameter settings
1. Test pressure value: Reasonable pressure should be set according to the actual usage scenario of the product. Low pressure cannot trigger potential leakage, while high pressure may damage the sample or cause atypical leakage.
2. Holding time: The holding time should balance sensitivity and efficiency. It is difficult to detect slow leaks in a short period of time, and over a long period of time, it reduces detection efficiency. Usually, the optimal duration needs to be determined through experiments.
3. Leakage determination threshold: The threshold setting directly affects the qualification rate determination. Being too strict may lead to the misjudgment of qualified products as defective, while being too lenient may result in the omission of unqualified products.
3、 Characteristics of the tested sample
1. Material and structural differences: The elastic modulus, hardness, and other characteristics of different materials affect their deformation behavior under pressure. For example, plastic containers and metal cans require a differentiated testing scheme.
2. Surface treatment process: The roughness and cleanliness of the sample surface will affect the adhesion of the sealing surface, thereby affecting the repeatability of the test results.
3. Content properties: Content containing liquid or powder may block the leakage channel and mask the true leakage situation. This type of sample requires special pre-treatment or customized tooling.
4、 Environment and operating conditions
1. Temperature and humidity control: Special temperatures can cause material thermal expansion and contraction, changing the leakage rate; High humidity may cause electronic component failure or sample moisture deterioration.
2. Operational standardization: Deviations from the testing area and human reading errors can be introduced when the sample installation position deviates. Standardized operating procedures and personnel training are crucial.
3. External vibration interference: Mechanical vibrations generated during equipment operation may accelerate sample fatigue failure and cause false leakage signals. Shock absorbers need to be installed and kept away from the vibration source.
5、 Data Processing and Analysis System
1. Data collection frequency: High frequency sampling can more fully record pressure change curves and capture instantaneous leakage characteristics; Low frequency sampling may miss key data points.
2. Intelligent algorithm model: Advanced equipment equipped with pressure attenuation trend analysis, multi-stage linear fitting and other functions can filter noise interference and improve judgment accuracy.
The performance of the positive pressure sealing tester is influenced by multiple factors such as equipment hardware, parameter settings, sample characteristics, environmental conditions, and data processing. In practical applications, it is necessary to comprehensively consider various factors and select appropriate testing equipment and methods to ensure the accuracy and reliability of the test results.