Patent ID: 8468840

Claim:
A method for supplying gas from a multi-container system comprising the steps of: providing a multi-container system comprising at least a first and second container; monitoring individual weights of at least the first and second containers over multiple time increments; generating a real-time profile for each of the individual weights of at least the first and the second containers; determining whether the profile exhibits a trend of increasing weight over multiple time increments in at least one of the first or second containers that exceed a first predetermined set point or a second predetermined set point greater than the first predetermined set point; generating a first alarm when the trend of one of the profiles exceed the first predetermined set point; generating a second alarm when the trend of one of the profiles exceed the second predetermined set point and switching to the other container in response to the second alarm; whereby overfilling of at least the first or second container without operator intervention is prevented by intermittently switching between the first container and the second container, wherein the first container is an on-stream container and the second container is a backup supply container.