Chemical concentration control system for fluid circulators

Details Chemical concentration control system for fluid circulators Chemical concentration control system for fluid circulators

1980-07-25

1981-12-22

Spiegel, H. Jay

Fluid handling

Self-proportioning or correlating systems

Mixture condition maintaining or sensing

137 5, 137563, G05D 1113

Patent

active

043065813

ABSTRACT:
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; a chemical concentration control system for the automatic addition of liquid chemicals for maintaining a predetermined concentration thereof within the tank comprises a diverter and chemical additive pipe connected to the discharge pipe for continuously sampling the solution and outletting into the tank. An aspirator is connected into the diverter pipe and has a low pressure additive intake pipe connected 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 upstream 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 signal of the conductivity cell, the controller automatically energizing and opening the solenoid control valve.

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patent: 4016079 (1977-04-01), Severin
patent: 4033871 (1977-07-01), Wall
patent: 4224154 (1980-09-01), Steininger

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