System and method for producing and maintaining predetermined proportionate mixtures of fluids

摘要

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.