In production environments, external factors such as temperature differences have a certain negative impact on the leak detection of airtight leak detectors. How should we use helium leak detection equipment to ensure good test results?

In order to use helium leak detection equipment correctly, it is necessary to pre evacuate the evacuated sample before filling the leak detection gas. If the air in the specimen is not emptied before filling, it will be compressed to the end of the geometric space, and the gas in the helium leak detection equipment cannot enter this part. Therefore, potential leak detection holes will only release air, and the leak detection equipment cannot detect these leak detection holes.

2. The leakage holes of helium leak detection equipment are usually very small or narrow. If the leakage holes are placed in the water tank before the leak detection gas test, these leakage holes or capillaries will be blocked or filled with water, greatly affecting the leak detection results.

Before filling the leak detection gas, it is necessary to quickly test for major leaks. A simple testing method for large leakage holes is to evacuate the sample in a short period of time and observe the evacuation pressure. If the sample can maintain the evacuation pressure, it indicates that there are no large leakage holes and can be filled with leak detection gas.

If the airtight leak detector is not tested for leaks under high pressure during operation, the helium leak detection equipment will not be able to detect some leakage holes. Therefore, using higher testing pressure during the leak detection process can effectively detect leakage holes that have not occurred in actual operation.

The detectable leakage rate in leak testing is closely related to the background concentration of the leak detection gas. The higher the background concentration, the greater the fluctuation. If the leak detection gas is discharged into the leak detection area after the leak test, the background concentration will continue to increase throughout the working day. In addition, during the filling or discharging process, ensure that no gas overflows and regularly check for leaks in the connectors.

If the leak detection gas leaks helium and hydrogen, it will fly like a balloon to the top of the leak detection area and gradually float throughout the entire leak detection area. Therefore, sufficient ventilation should be provided for the leak testing area. Due to the tendency of both leak detection gases to move upwards, it is recommended to input fresh air from the bottom and discharge gas from the top outward.