A well-engineered sealing concept is the foundation of durably accurate leak testing. A large part of our expertise is in this very area. Answering crucial questions is of the essence:
How and in what order are components sealed?
How can various test spaces be measured using the right test procedure?
What order are components tested in?
What is the mechanical sequence?
What kind of clamping forces are likely to act on the component?
The design for these complex processes is developed and worked out by our engineers, master craftsmen and technicians, and coordinated in detail with our customers.
We are in charge of production, from equipment to consumables.
Rubber seals are of crucial importance in this process. They serve as the connection between testing device and component. Their quality determines the precise testing position and is essential to a reliable seal. Due to the elementary importance of these aspects, we produce seals in-house, providing significant advantages for our customers:
Depending on the component and the desired leakage rate, different testing procedures are necessary to ensure the specific tightness according to the given parameters. Measurement procedures with air are common and cover many various requirements. Measurement procedures with gas cost more time, effort and money, but can detect even smaller leakage rates. If components do not meet the desired requirements, leak localization may be necessary in order to find the defects.
The pressure difference procedure is inexpensive and is especially suitable for small testing volumes. A pressure difference transmitter detects drops in pressure. The system can calculate the leakage rate based on the configured testing volume
The mass flow test is suitable for larger testing volumes in order to achieve shorter cycle times. The test air is siphoned from an external solid volume into the component. After pressure equalization, the air flow escaping from the component is measured. As a result, a stable measurement result is achieved.
Flow testing is used to determine whether openings, such as bore holes, provide the required permeability. It is possible to determine closures of ≥30% with this procedure. The back-pressure test can identify bottlenecks precisely by means of possible air back pressure.
As with pressure difference testing, vacuum testing uses negative pressure to test a component. This procedure is especially useful for components that cannot put up with high clamping forces.
For parts or prototypes whose leak testing results fall outside the standard range, the site of the problem can be precisely determined using leak localization. In a submersion test, the component is filled with air in a transparent water tank. Leaks can be precisely located through the formation of bubbles. Alternatively, the sealed and helium-filled component can be checked using a leak sniffer.
By comparison to measurements using air, the helium accumulation test helps to identify significantly lower leakage rates due to the usage of a mass spectrometer. This method requires a separate test chamber where the component needs to be clamped.
First, the component is checked in a measurement procedure using air. This is to ensure that no helium contamination of the environment occurs if gas testing reveals large leaks.
Provided that the values of the air testing are within the standard range, the testing device is sealed off, and the component is filled with helium. Using a fan, potentially escaping helium is evenly distributed within the test chamber.
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We combined all of our core areas to create a complete system for the supplier of a well-known automotive manufacturer from China.
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