Controller deviation indicator

Details Controller deviation indicator Controller deviation indicator

1979-06-12

1981-03-03

Waring, Alvin H.

Communications: electrical

Condition responsive indicating system

With particular system function

340506, 340517, 340521, G08B 1900

Patent

active

042544122

ABSTRACT:
A deviation indicator interface for simultaneously providing an indication of the deviation of the process value from the set point for each loop of a multi-loop controller is disclosed. The deviation indicator interface includes a plurality of deviation indicators, each deviation indicator providing an indication of the loop deviation of a single loop. Each deviation indicator includes a first, second and third indicator portion. The first indicator portion produces a visible signal whenever the loop process value exceeds the loop set point by at least a first amount, the first amount being adjustable. The second indicator portion produces a visible signal whenever the loop process value is less than the loop set point by at least a second amount, the second amount being adjustable. The third indicator portion produces a visible signal whenever the loop process value (1) is equal to the loop set point, (2) exceeds the loop set point by an amount less than the first amount, or (3) is less than the loop set point by an amount less than the second amount.

REFERENCES:
patent: 3623087 (1971-11-01), Gallichotte
patent: 3940739 (1976-02-01), Quimet
patent: 4115754 (1978-09-01), Duzich

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