Fluent material handling – with receiver or receiver coacting mea – Processes – Gas or variation of gaseous condition in receiver
Reexamination Certificate
2009-05-18
2011-10-04
Nguyen, Dinh (Department: 3752)
Fluent material handling, with receiver or receiver coacting mea
Processes
Gas or variation of gaseous condition in receiver
C141S083000, C141S094000, C141S098000, C141S255000, C222S077000
Reexamination Certificate
active
08028723
ABSTRACT:
A receiving container is filled with a predetermined target mass mzof a free-flowing substance from a reservoir with the help of a dosage-dispensing device that dispenses measured doses of the substance. The device has a valve for variably setting the mass flow {dot over (m)} from the reservoir into the receiving container. The device is also able to determine the time t that has elapsed since the beginning of the fill cycle, the mass m of the substance present in the receiving container, and a unit for controlling the valve. The controller unit includes estimating and correction modules. At least once during the fill cycle, the estimating module performs an estimate of the mass {tilde over (m)}(t, t2) that is expected to be present in the receiving container at the end of the fill cycle at the time t2. This estimate is based on the assumptions that from the time t onward the valve is being closed according to a predefined closing-down profile and the fill cycle is completed at the time t2. The correction module compares the mass {tilde over (m)}(t, t2) estimated at the time t to the target mass mz. If the estimated mass {tilde over (m)}(t, t2) is smaller than the target mass mz, the valve is controlled so that the aperture associated with the mass flow {dot over (m)} that exists at the time t will be maintained longer by a differential time segment Δt, and/or the mass flow {dot over (m)} at the time t is increased.
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Mettler-Toledo AG
Nguyen Dinh
Standley Law Group LLP
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