Differential pressure decay leak tester dsound® Cap Check

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With the dsound® Cap Check system, leaking containers with metal closures are detected precisely, non-contact, and reliably. The system enables fast inline inspection directly within the production line and achieves throughputs of up to 72,000 containers per hour.

The overall system consists of a base unit for magnetic excitation and a highly sensitive airborne sound sensor with integrated signal analysis and evaluation. Both components are integrated into existing production lines on a customer-specific basis, enabling fully automated leak testing without any mechanical intervention in the inspection process.

The operating principle is based on the physical concept of internal container pressure: leaking containers exhibit a different vibration behavior of the lid or closure. These differences are reliably detected by the system. The acoustic sensing technology is capable of identifying even very small leaks that cannot be detected by other inspection methods, or only with significant effort.

For this purpose, the excitation unit generates a specifically optimized magnetic field that induces defined vibrations in the lid or closure. The resulting acoustic signals are captured by the airborne sound sensor dsound® USS4-LS-E and evaluated using advanced filter and signal processing algorithms.

To ensure stable and reproducible detection, the system compensates for variations in container dimensions as well as material-related tolerances of the closures. This is achieved through a set of digital controllers that automatically balance process fluctuations, thereby significantly reducing the level of false rejects.