Standard ALPS leak test solutions incorporate two main test methods: Pressure Decay and Vacuum Decay. Each leak test solution requires that a volume is enclosed and tested to determine if there is pressure/vacuum change due to leakage out of, or into, the test volume.
In Empty Container Leak Testing, Pressure Decay is the dominant method for on-line leak test solutions. The container opening is sealed for purposes of the test and leakage outside of this volume to atmosphere is detected. Vacuum Decay can be used if there is a requirement to verify that the container can hold a minimum vacuum level (e.g. for products that are vacuum packed).
In Filled & Sealed Container Leak Testing, Vacuum Decay is the most common method for on-line and off-line leak test solutions. For verifying seal integrity, an enclosed test volume is created around the product's sealing area. For verifying seal and package integrity, the entire part is enclosed into a chamber. In each case, leakage into this enclosed volume is detected.
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