Process measurement and control

Chemistry of inorganic compounds – Nitrogen or compound thereof – Ammonia or ammonium hydroxide

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Details

23230A, 23232E, 23253A, 23255E, 364105, 364111, 423362, 364500, C01C 104, G06F 1518, G06F 1546, G06G 758

Patent

active

040949591

ABSTRACT:
In the measurement of a variable process parameter and control of the process in response thereto, a transform of a process parameter measurement signal that can be described as the time derivative of a second order or higher lagged process parameter measurement signal is utilized to provide predictive capability. This transform is combined with the output of a PI controller to the input of which the process parameter measurement signal has been fed, thereby generating a process variable signal that either directly or after passing through another controller is utilized as a process control signal for controlling the process in response to the measured parameter. The system is particularly well adapted to control of a non-self-regulating process.

REFERENCES:
patent: 3220998 (1965-11-01), Berger
patent: 3471582 (1969-10-01), Lupfer
patent: 3676066 (1972-07-01), Pennington
patent: 4021201 (1977-05-01), Vantrain et al.
patent: 4025498 (1977-05-01), Buss et al.

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