G - Physics – 01 – N
Patent
G - Physics
01
N
324/23
G01N 22/00 (2006.01) G05D 21/02 (2006.01) G05D 23/24 (2006.01)
Patent
CA 1181486
Abstract of the Disclosure There is disclosed a method and apparatus for quickly and accurately measuring selected characteristics of a fluid. Particular applications to the printed circuit industry is described in which the concentration of a chemical in a solution is monitored and maintained at a preselected level. Portions of the solution are continually pumped through a microwave sensor that senses the attenuation of the microwave radiation as the solution passes through a sensor. The attenuated signal detected beyond the solution is compared to the signal as detected in the sensor in advance of the solution. If the signals differ by an amount different from the initial amount, the concentration of the chemical is adjusted accordingly. Circuitry is also provided to accommodate differences in the microwave detectors' responses to microwave radiation as a function of temperature, and delays in dissolving the chemical in solution. Alarm signals are generated if the concentration of the chemical in the solution differs from a preselected concentration by more than a preselected amount and chemicals are added by pumps if the concentration drops below selected levels.
396934
Cole Everett
Heiser Lawrence
Consolidated Design Inc.
Smart & Biggar
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