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Leak detector use standards and attention
- 2020-06-16-

If the leak detector is mainly used to detect packaging bags, bottles, boxes, etc. in the food, medicine, equipment, electronic components and other industries; as the time goes by, the waterproof and airtightness setting equipment is updated. With the new generation, the needs of users to choose waterproof testing and air tightness testing equipment will also change with the upgrading of technology at the time;

In the process of leak test, if the test sample is found to be leaking, it should not be directly repaired under pressure. Chalk can be used to mark the leak. After the leak detection of the whole system is completed, the air-tight leak tester will be repaired after the pressure is relieved. Airtightness test is done in winter. When the ambient temperature is lower than 0℃, the airtightness tester can prevent the soapy water from solidifying and affect the leak test effect. A certain amount of alcohol or white wine can be added to the soapy water to reduce the solidification temperature and ensure the inspection. Leaking effect.

The number of repair welding of the weld joint shall not exceed twice. If it exceeds two times, the weld joint shall be sawed off or the pipe shall be re-welded by the waterproof test equipment. If a slight leak is found, it should be repaired, and the method of punching and squeezing must not be used to make it leak-proof. After completing the leak repair work, the pressure test should be performed again until the entire system does not leak.

Through the analysis of the working principle and process parameters of the differential pressure method air tightness detection, the orthogonal experimental design method is adopted to quickly determine the key influencing process parameters of the differential pressure method air tightness detection, and the detection efficiency and accuracy are improved. Inflation process: The air tightness tester adjusts the system pressure to the test pressure, opens the inflation valve, the leak test valve, and the standard container and the tested workpiece are filled with compressed air whose pressure is equal to the test pressure. Due to the influence of the gas flow, the system The internal pressure and temperature will fluctuate, and the inflation must be continued until the standard container and the tested workpiece are fully inflated.

Balance process: close the inflation valve and the leak detection valve, cut off the path between the gas source and the standard container and the tested workpiece. The action of the inflation and closing valve will cause the gas pressure in the container to pulsate, resulting in the difference between the standard container and the tested workpiece The pressure is unstable, showing irregular changes, and must be delayed for a period of time, and the differential pressure change can be measured after the differential pressure value is stable. Detection process: Detect the output of the differential pressure sensor. The pressure drop due to leakage is approximately proportional to the time near the test pressure, so the change in the differential pressure within a certain period of time can be measured. Exhaust process: After measuring the change value of the differential pressure, the remaining gas in the standard container and the measured workpiece is exhausted to the atmosphere through the gas valve, and the detection process is ended.

Users can compare products based on simple test experiment groups, such as using different temperature differences to conduct waterproof and air tightness tests at different time periods. The data tested by poor quality leak detectors will have small errors. With higher quality, high-quality air-tightness testers with measurement accuracy calibrated will not have this situation; users can also make preliminary eliminations in this way when choosing to purchase.