Patent ID: 8008082
Filing Date: 2011-08-30
Classification: B01F,Y10T

Abstract:
1. A circuit comprising: a signal monitoring circuit configured to: monitor a property of a first signal from a first sensor positioned to monitor a property of a first solution, wherein the property of the first signal varies as a function of the property of the first solution, monitor a property of a second signal from a second sensor positioned to monitor a property of a second solution, wherein the property of the second signal varies as a function of the property of the second solution; and a control circuit configured to compare the property of the first signal and the property of the second signal to a property of a reference signal to determine whether to provide a first control signal for dispensing the first solution, or provide a second control signal for dispensing the second solution, wherein the control circuit comprises a latching circuit configured to latch one of either the first control signal or the second control signal until the property of the solution being dispensed crosses a predefined threshold, then latching the other of the first control signal or the second control signal so that the other solution is dispensed until the property of the other solution for which the control signal is now latched crosses the predefined threshold.