Fluid handling – Processes – With control of flow by a condition or characteristic of a...
Patent
1995-08-28
1998-10-20
Fox, John
Fluid handling
Processes
With control of flow by a condition or characteristic of a...
137 93, F16K 3100
Patent
active
058232192
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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MacBride William R.
Norman Edward C.
Purvis Fay A.
Fox John
National Foam, Inc.
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