System and method for monitoring and maintaining a predetermined

Details System and method for monitoring and maintaining a predetermined System and method for monitoring and maintaining a predetermined

1976-03-22

1980-09-16

Rolla, Joseph J.

Dispensing

Automatic control

By weight, volume or pressure of a second dispensed material

222DIG1, 222161, 356433, 118689, B23Q 3500

Patent

active

042224977

ABSTRACT:
A system and method for monitoring and maintaining a predetermined concentration of material in a fluid body or carrier includes a control arrangement for detecting the transmissivity of a flow cell in each of two states. One of the states during which the flow cell is observed contains substantially no fluid present therein but provides a basis for determining the degree of existence of external factors affecting measurements made via the flow cell. The measurements for one state are subtracted from the measurements for the other in order to determine the transmissivity of the fluid body itself as distinguished from the combination of fluid body and flow cell.

REFERENCES:
patent: 2640629 (1953-06-01), Thomson et al.
patent: 2791932 (1957-05-01), Hall
patent: 3354802 (1967-11-01), Doucette et al.
patent: 3377988 (1968-04-01), Zawiski
patent: 3494328 (1970-02-01), Maloney
patent: 3677222 (1972-07-01), Komori et al.
patent: 3890510 (1975-06-01), Sturm
patent: 3926145 (1975-12-01), Muth
patent: 3954342 (1976-05-01), Boeke
patent: 3976891 (1976-08-01), Parkinson
patent: 4032227 (1977-06-01), Hubbard et al.

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