G - Physics – 05 – D
Patent
G - Physics
05
D
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G05D 11/00 (2006.01) B01J 4/00 (2006.01) G05D 21/02 (2006.01)
Patent
CA 1133258
ABSTRACT OF THE DISCLOSURE In a chemical solution circulator including a tank, a pump with an intake pipe connected to the tank and a discharge pipe for delivering solution to an enclosure communicating with the tank, and a chemical concentration control system for the automatic addition of liquid chemicals for maintaining a pre- determined concentration thereof within the tank comprising a diverter and a chemical additive pipe connected to the discharge pipe for continuously sampling the solution in the discharge pipe, independent of the main flow of the solution and the dis- charging into the tank. An aspirator is connected into the diverter pipe and has a low pressure additive intake pipe con- nected to a chemical solution storage tank. A normally closed solenoid valve is interposed in the additive intake pipe. An electronic controller is connected to the valve. A flow-through conductivity cell is interposed within the diverter pipe up- stream of the aspirator for signaling the controller at a set value maintaining the valve closed. A predetermined reduction of chemical concentration in the solution interrupting the sig- nal of the conductivity cell, the controller automatically energizing and opening the solenoid control valve.
366005
Alandt George A.
Frayne & Company Robert
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