Method of continuous monitoring of process variables of varying

Details Method of continuous monitoring of process variables of varying Method of continuous monitoring of process variables of varying

1991-09-12

1993-03-02

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340500, 340506, 364130, 364143, G08B 2300

Patent

active

051913135

ABSTRACT:
A process control system which is controlling a continuous process produces an output product having a first grade. The process control system performs quality checks at predetermined times on the output product for verifying predetermined parameters of the output product of the first grade are within predetermined limits. A method for dynamically monitoring the continuous process (without shutting down the process) when the grade of the output product is changed to a second grade having second predetermined limits, comprises the steps of initiating new setpoints for the continuous process to produce an output product having the second grade. The predetermined parameters of the output product is verified by the process control system to be within second predetermined limits of the second grade. When the predetermined parameters of the output product fall outside the second predetermined limits, an alarm is indicated, and the output product divert to a bypass path.

REFERENCES:
patent: 3665399 (1972-05-01), Zehr et al.
patent: 4263583 (1981-04-01), Wyckoff
patent: 4399428 (1983-08-01), Hughes et al.
patent: 4885573 (1989-12-01), Fry et al.

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