Apparatus for measuring chemical levels using pH shift
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United States of America Patent
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Dec 29, 2009
Grant Date -
Nov 20, 2008
app pub date -
May 14, 2007
filing date -
May 14, 2007
priority date (Note) -
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Abstract
An apparatus for use in measuring the free chlorine level in a solution of halogenated pool/spa water includes a pH adjusting device for producing a first sample of said solution having a first selected pH and a second sample of said solution having a second selected pH, as well as a spectral analyzer for determining first and second ultraviolet light (UV) transmissivity values for each of the first and second samples. An electronic processor receives the first and second transmissivity values and determines the free chlorine or bromine level using those values.
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