pH control system for an aqueous liquid reservior
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United States of America Patent
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Aug 7, 1990
Grant Date -
N/A
app pub date -
Nov 2, 1989
filing date -
Nov 2, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An aqueous liquid reservoir system has a flow line for circulating a portion of the aqueous liquid from the reservoir and returning such aqueous liquid back to the reservoir. The flow line has an injection means for inducing quantities of pH affecting liquid into the flow line. A pH probe means is coupled to the flow line upstream of the injection means for detecting the pH of the aqueous liquid from the reservoir. The system includes a computer control which compares the pH from the pH probe means with a preselected pH and activates dispensing means to provide a measured quantity of pH affecting liquid for injecting into the flow line responsive to aqueous liquid flowing therein to maintain the pH of the aqueous liquid within the preselected pH tolerance. The measured quantities of pH affecting liquid are provided by a control chamber means having a gravitational feed system for the pH affecting liquid.
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