Liquid purification or separation – With alarm – indicator – register – recorder – signal or...
Reexamination Certificate
2004-11-24
2008-07-01
Drodge, Joseph W (Department: 1797)
Liquid purification or separation
With alarm, indicator, register, recorder, signal or...
C073S001020, C073S001030, C137S093000, C137S268000, C137S572000, C210S096100, C210S167110
Reexamination Certificate
active
07393450
ABSTRACT:
A system automatically maintains at least one of a pH level and a sanitizing agent level of water in a water feature. The system includes a sensor assembly responsive to at least one of a pH level of the water and a sanitizing agent level of the water. The system further includes a controller which generates control signals in response to signals from the sensor assembly. The system further includes at least one of a first source containing an sanitizing agent material and a second source containing a pH-modifying material. The system further includes a third source comprising a valve assembly and a third container containing a liquid calibrant material. The valve assembly is responsive to at least a portion of the control signals from the controller by selectively allowing the calibrant material to flow from the third container through the sensor assembly to the water feature.
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Drodge Joseph W
Sewell Jerry Turner
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