Data acquisition system for the computer control of aluminum sme

Details Data acquisition system for the computer control of aluminum sme Data acquisition system for the computer control of aluminum sme

1984-05-31

1987-01-20

Gruber, Felix D.

Boots, shoes, and leggings

364481, 364500, 204 1T, 204 67, 204228, 204244, G01R 1900, C25C 300, C25C 306, C25C 320

Patent

active

046384413

ABSTRACT:
Disclosed is a system for measuring cell potentials in an aluminum potline having a plurality of cells connected in series. The system enables better control of the cells than the current method which calculates cell resistance on the basis of measured cell potentials and potline current but an assumed value of back e.m.f. The present invention uses corrected voltage measurements and provides a decentralized, current independent cell potential measuring system which converts simultaneously all cell potentials during a normal integration period (e.g. 1 second) into a value corresponding to the potline current when it is at its normal (set-point) value. Simultaneously, various possible back e.m.f. values are measured with the same current relationship and computations made of the error caused by the non-ohmic portion of the cell potential when the current deviates from its normal (set-point) value. Sudden changes in current enable correct values of back e.m.f. to be determined.

REFERENCES:
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patent: 3629079 (1971-12-01), Bristol
patent: 3734841 (1973-05-01), Thomas
patent: 3812024 (1974-05-01), Goodnow et al.
patent: 3888747 (1975-06-01), Murphy
patent: 4008142 (1977-02-01), Dering et al.
patent: 4048041 (1977-09-01), David et al.
patent: 4488117 (1984-12-01), Seo

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