Leak Testing of Encapsulated Systems

Particularities of Leak Testing non-fillable Products | Quality Control through Routine Test during the Production Process

Encapsulated systems such as sensors, actuators, microswitches, relays, cameras and displays often need to be reliably protected against moisture and other environmental influences and are therefore subjected to 100% leak testing during production. Since these products cannot be filled directly with compressed air from the inside, testing is performed using a product-specific test hood. The Application Note describes a two-stage test procedure in which gross leaks are first detected by pneumatically determining the test volume, followed by fine leak measurement based on the pressure gradient caused by leakage. Practical examples show how test pressure, permissible leakage rates and test times can be designed for products ranging from very small components to larger encapsulated systems.