Fuel cells and closed individual cells
After the bipolar plates are assembled to form the helium leak detector vacuum leak detection equipment, end-of-line testing is required. However, the test can still be useful after the previous intermediate steps. For all these tests on assembled fuel cells, helium is also used as the test gas. If instead hydrogen was used, there would be the risk that the fuel cell would already inadvertently produce electricity. Hydrogen is also prohibited as a test gas for safety reasons, since large leaks in the hydrogen circuit can quickly lead to flammable hydrogen concentrations above 4% in the air. In practice, typical limiting helium leak rates for leak testing mounted fuel cells are in the range of 10-3 to 10-5 mbar∙l/s. The tolerable leakage rate for the entire fuel cell also depends crucially on the specific installation situation in the vehicle. The flow rate at which a 4% concentration of flammable hydrogen in air can occur is not only a matter of the tightness of the fuel cell, but also of the surrounding volume in the vehicle and the air exchange in this environment. These factors should also be considered when determining a reasonable flow rate.
When the necessary equipment and valves are attached to a hydrogen tank, the original body of the tank becomes what is called the tank module. Both the helium vacuum method and the gas formation accumulation method are suitable for testing the tank body. In the latter case, the part to be tested is exposed to a non-flammable mixture of 5% hydrogen and 95% nitrogen, a commercially available formation gas. The leak rate is calculated from the amount of test gas that escapes afterwardsBut the specific components of fuel cell vehicles also require a highly reliable leak test. Especially since the term hydrogen is quickly associated with the word danger in the public mind. Therefore, continuous quality assurance is essential. Gas based testing methods are the way to go.
According to helium industry consultant Phil Kornbluth, the shortage is largely due to planned and unplanned maintenance outages at helium plants. (CBC)
The Helium Bubble Leak Test Machine have been significant in the balloon sector, with some seeing increases of up to 300% in the last six months.
When considering the decibel levels obtained by the ultrasonic instrument and for the ultrasonic leak report to be as accurate as possible, the inspector should record the decibel levels obtained by the ultrasonic instrument approximately 15 inches from the confirmed location of the flow If the decibel levels are taken too close to the location of the leak, the report will likely overestimate the cost and CFM loss of the leak. Several independent studies have compared ultrasonic leak inspection reports
for actual energy savings, and they found that ultrasonic leak inspection is 20% of actual compressed air leakage savings. When done correctly, an ultrasonic inspection of compressed air leaks can have a large return on investment in a short period of time – of course after the leaks are repaired. Helium is an essential element in many industries, including healthcare, aerospace, IT, and the automotive industry, which is the focus of this article. Helium is essential for automotive engineering and the green transition to zero-emission vehicles, playing a vital role in semiconductors, leak detection, welding, testing and airbags. Its unique characteristics, such as inertia and cold temperature, make it ideal for these applications.
Semiconductors are essential components in the automotive industry, especially in modern electric vehicles, because of their computational capacity. The “brain” of the vehicle enables all electronic processes, such as energy and car management, infotainment systems, autonomous driving and even headlights. Usually made of silicon, semiconductors conduct electricity better than insulators and are found in computer chips and processors.
During the semiconductor manufacturing process, chemical reactions are usually gas or liquid based. Using an inert gas, such as helium, around the silicon helps prevent unwanted reactions because helium does not react with other elements. In addition, helium has a high thermal conductivity, which facilitates the transfer of heat, which allows effective control of the temperature during the manufacturing process and allows semiconductors to be miniaturized.
Automoble with Helium Mass Spectrometry Leak Detector is commonly used in leak detection testing during the manufacturing processes of cells, modules and batteries because it is non-toxic, non-flammable and does not react with other substances. Injecting Helium into the system and monitoring its presence outside the system allows technicians to quickly and accurately detect even the smallest leaks.
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