Process measurement and control

Details Process measurement and control Process measurement and control

1977-02-02

1978-06-13

Scovronek, Joseph

Chemistry of inorganic compounds

Nitrogen or compound thereof

Ammonia or ammonium hydroxide

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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