Pneumatic controller

Details Pneumatic controller Pneumatic controller

1977-11-08

1979-05-08

Cohan, Alan

Fluid handling

Pressure modulating relays or followers

Plural series units

137 86, 137DIG1, F15B 500, G05D 1600

Patent

active

041530683

ABSTRACT:
Discloses a pneumatic controller having a proportional band altering unit, a proportional plus integral operation unit, a comparator and a manual-automatic transfer means, wherein the proportional band altering unit is combined with the proportional plus integral operation unit to provide a proportional band altering mechanism which limits input to prevent output of the comparator from being saturated whereby to enable the pneumatic controller to perform the transfer between the manual and automatic modes in a balanceless and bumpless manner.

REFERENCES:
patent: 3572360 (1969-07-01), Lloyd
patent: 3680580 (1972-08-01), Beardsley
patent: 3908085 (1975-09-01), Caldwell

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