Reactants addition and concentration control system

Details Reactants addition and concentration control system Reactants addition and concentration control system

1976-06-04

1977-06-28

Nilson, Robert G.

Fluid handling

Processes

With control of flow by a condition or characteristic of a...

137 89, 137 93, G05D 1108

Patent

active

040319121

ABSTRACT:
A system for controlling the silver ion concentration of a silver halide emulsion made by mixing alkali halide and silver nitrate solutions which are delivered continuously to a vessel at primary addition rates. The silver ion concentration in the vessel is measured to establish the deviation from a desired concentration. Where the error is within a limited or normal range, a low signal selector circuit causes a pump in a secondary flow loop to deliver a secondary amount of whichever solution is needed to offset the deviation. Where the error is abnormal, a high signal selector circuit alters the primary addition rate of the alkali halide solution to offset the deviation.

REFERENCES:
patent: 3195551 (1965-07-01), Russell
patent: 3376883 (1968-04-01), Douty

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