System and method for producing and maintaining predetermined proportionate mixtures of fluids
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United States of America Patent
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Oct 20, 1998
Issued Date -
N/A
app pub date -
Aug 28, 1995
filing date -
Aug 18, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A system and method for continuously producing and maintaining a predetermined proportionate mixture of two fluids, such as water and foam concentrate, in accordance with conductivity measurements of the fluids and the mixture. A set point is established which is representative of the conductivity of the predetermined proportionate mixture, by way of continuously measuring the conductivity of each fluid and feeding data to a microprocessor which calculates the conductivity of the desired proportionate mixture. The conductivity of the mixture is measured and compared with the set point by conductivity probes and a microprocessor. A control valve is continuously adjusted to maintain the predetermined proportionate mixture in response to control signals from the microprocessor in accordance with the comparisons of the conductivity values.
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