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Patent
Hach Company | Date: 2015-05-26

A method for determining the total organic carbon in a sample which includes mixing the sample with a reagent containing at least one acid effective for reacting with inorganic carbon-containing materials in the sample, and at least one oxidizing agent effective for oxidizing organic carbon-containing materials in the sample in the presence of ultraviolet radiation, and detecting the carbon dioxide generated, is described. The at least one acid may include phosphoric acid, while the oxidizing agent may include sodium persulfate. In accordance with an embodiment of the inventive concept, the sample is first injected into a reaction chamber, which is continuously flushed with carbon dioxide free gas with no UV light present, and CO


Patent
Hach Company | Date: 2015-04-02

An aspect provides a method of determining a concentration of free chlorine in an aqueous sample, including adding a reagent to the sample, the reagent being reactive with the free chlorine at a first kinetic rate and reactive with at least one chloramine at a second kinetic rate, the first kinetic rate being different from the second kinetic rate; measuring an absorbance response over time resulting from reaction of the free chlorine and the at least one chloramine with the reagent over time; and determining the concentration of the free chlorine in the sample based on a determined rate of change of the absorbance response over time. Other aspects are described and claimed.


Patent
Hach Company | Date: 2015-03-18

Oxidation/reduction measurement is described. An aspect provides an oxidation/reduction quantification method, including: receiving intermittent oxidizer/reducer reference measurements from one or more reference sensors; receiving one or more substantially continuous oxidizer/reducer-related measurements from one or more corroboration sensors; and processing the one or more substantially continuous oxidizer/reducer-related measurements with the intermittent oxidizer/reducer reference measurements to generate substantially continuous representative oxidizer/reducer measurements. Other aspects are described.


Patent
Hach Company | Date: 2015-10-02

An embodiment provides a method, including: operating a motor to position sample fluid within a fluid channel of a cuvette; transmitting light through an optical chamber of the cuvette; measuring a value of received light that has been transmitted through the optical chamber; comparing the measured value of light to one or more thresholds; determining a position of the sample fluid within the fluid channel based on a comparison from the comparing step; and generating a response based upon the position of the sample fluid with the fluid channel. Other aspects are described and claimed.


Patent
Hach Company | Date: 2015-10-02

An embodiment provides a cuvette, including: a body having a fluid channel therein; and an outer surface having encoded information disposed thereon and readable by a reader of a sample instrument. Other aspects are described and claimed.

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