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公开(公告)号：US20200378893A1
公开(公告)日：2020-12-03
申请号：US16425173
申请日：2019-05-29
Applicant: Hach Company
Inventor： Amit Das
Abstract: An embodiment provides a method for measuring sulfite in a solution, including: preparing a hemicyanine indicator; introducing the hemicyanine indicator to a solution containing an amount of sulfite, wherein the hemicyanine indicator reacts with the sulfite and causes a change in fluorescence of the solution; and measuring the amount of sulfite in the solution by measuring an intensity of the fluorescence. Other aspects are described and claimed.
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公开(公告)号：US20200247696A1
公开(公告)日：2020-08-06
申请号：US16649564
申请日：2018-09-28
Applicant: HACH COMPANY
Inventor： Cary Burton Jackson
Abstract: An embodiment provides a method for quenching hexavalent chromium, including: obtaining a vessel comprising an aqueous sample comprising hexavalent chromium; introducing a reducing agent to the aqueous sample; and mixing, into a mixed solution, the reducing agent and the aqueous sample, wherein the mixing causes the reducing agent to quench the hexavalent chromium and wherein a quantity of the reducing agent comprises a quantity that reduces the hexavalent chromium to trivalent chromium.
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公开(公告)号：US20200158618A1
公开(公告)日：2020-05-21
申请号：US16614898
申请日：2018-05-18
Applicant: HACH COMPANY
Inventor： Cary Burton Jackson , Richard Edward Leggett
Abstract: One embodiment provides a system, including: at least two water analyzers, wherein at least one of the at least two water analyzers is positioned upstream of a purification apparatus and wherein at least another of the at least two water analyzers is positioned downstream of the purification apparatus; at least one processor; and a memory device that stores instructions executable by the processor to: receive water analysis data from the at least two water analyzers, wherein the water analysis data comprises information related to membrane integrity; identify an algorithm for calculating membrane integrity based upon received data corresponding to system attributes; and calculate, using the identified algorithm, the membrane integrity based upon the received water analysis data. Other aspects are described and claimed.
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公开(公告)号：US10527599B2
公开(公告)日：2020-01-07
申请号：US14154397
申请日：2014-01-14
Applicant: HACH COMPANY
Inventor： Teresa Lynn Swanson , Ronald P. Merwin
Abstract: A kit for determining if a shock treatment is required for a water source may comprise a test strip having at least two chemically treated test areas. One of the areas is responsive in color to a concentration of free chlorine in the water and another test area is responsive in color to a concentration of total chlorine in the water. A chlorine indicator scale may be provided on a substrate, such as a label, and comprises a plurality of pairs of colored indicia and each pair of colored indicia representing a color pattern indicating a concentration, or range of concentrations, of total chlorine and free chlorine in the water. An alphanumeric designation may be provided adjacent to each pair of indicia indicating whether a shock treatment is required for the water source based on a color pattern the associated indicia pattern.
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公开(公告)号：US20190317064A1
公开(公告)日：2019-10-17
申请号：US15951927
申请日：2018-04-12
Applicant: Hach Company
Inventor： Darren Kent MacFarland , Angella Nicholle Greenawalt
Abstract: An embodiment provides a method for measuring fluoride concentration in an aqueous solution, including: preparing a polyethylene glycol (PEG) monomethyl ether to produce an ester; reacting the ester in the presence of ammoniated tetrahydrofuran to produce an amino polyethylene glycol; placing, in a solution comprising a benzaldehyde species with a phenol functional group and a carboxylic acid functional group, a 2,3,3-trimethylindolenine derivative to produce a hemicyanine with a phenol functional group and a carboxylic acid functional group; combining, in a polar aprotic solvent, the hemicyanine with the phenol functional group and carboxylic acid functional group with a 1,1-carbonyldiimidazole (CDI) and adding the amino-PEG to produce a hemicyanine-PEG; and creating a fluoride sensitive hemicyanine species by reacting the hemicyanine-PEG that contains a phenol functional group with a SiR3 species. Other embodiments are described and claimed.
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Patent Agency Ranking
公开(公告)号：US20190317044A1
公开(公告)日：2019-10-17
申请号：US15955124
申请日：2018-04-17
Applicant: Hach Company
Inventor： Vishnu Vardhanan Rajasekharan , Corey Alan Salzer
IPC: G01N27/416 , G01N27/30
Abstract: An embodiment provides a method for compensating for inteferants in measurement of alkalinity in a reagent-less system, including: introducing an aqueous sample into a measurement device comprising one or more series of electrodes; applying an electrical signal to the aqueous sample using the one or more series of electrodes, wherein the electrical signal is selected from the group consisting of: current and voltage; identifying, during application of the electrical signal, that the electrical signal reaches an oxidation threshold and measuring, prior to reaching the oxidation threshold, a first electrical response to the electrical signal, the first electrical response attributable to interferants in the aqueous sample; identifying, during application of the electrical signal, that the electrical signal reaches an endpoint and measuring, from the oxidation threshold to the endpoint, a second electrical response to the electrical signal; and measuring an alkalinity of the aqueous sample based upon a difference between the first electrical response and the second electrical response. Other aspects are described and claimed.
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公开(公告)号：US10309948B2
公开(公告)日：2019-06-04
申请号：US15438572
申请日：2017-02-21
Applicant: Hach Company
Inventor： Vishnu Rajasekharan
IPC: G01N33/18 , G01N27/416 , G01N27/07 , G01N27/02
Abstract: A carbon quantifying cell configured to receive a fluid is provided, including two or more electrodes positioned at least partially in the fluid, and meter electronics configured to place an electrical oxidization, polarization, and/or adsorption program across the two or more electrodes and at least partially oxidize carbon materials in the fluid, apply an AC voltage of a predetermined amplitude across the two or more electrodes, measuring the resulting AC current across the two or more electrodes, wherein a ratio of amplitudes and a phase angle difference provides information for calculating a fluid impedance, receive an electrical response of the fluid to the electrical oxidization, polarization, and/or adsorption program, quantify the carbon materials in the fluid using the electrical response, and detect interfering materials in the fluid using the fluid impedance.
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公开(公告)号：US20190094198A1
公开(公告)日：2019-03-28
申请号：US15714455
申请日：2017-09-25
Applicant: Hach Company
Inventor： Arnold Bertron Kidd, IV
Abstract: An embodiment provides a method for measuring ions in a solution, including: preparing a measurement device comprising an active indicator, wherein the active indicator comprises a silver complex; introducing the measurement device to a solution, wherein the silver complex reacts with the solution and generates a precipitation comprising one of the elements selected from the group consisting of: silver chloride, silver sulfide, and mixtures thereof; and measuring an amount of one of the elements selected from the group consisting of: chloride and sulfide, in the solution, wherein the measuring comprises identifying a peak of the precipitation on a portion of the measurement device and comparing the peak to a measurement chart.
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公开(公告)号：US10175163B2
公开(公告)日：2019-01-08
申请号：US15281678
申请日：2016-09-30
Applicant: Hach Company
Inventor： Zhao Lu , Brian Harmon
Abstract: An embodiment provides a method for determining a concentration of an analyte in a fluid sample, including: introducing a fluid sample into a measurement chamber; operating a measurement device to introduce light of a first wavelength to the fluid sample; measuring, with a detector, absorbance of the light of the first wavelength with respect to the fluid sample; operating the measurement device to introduce light of a second wavelength to the fluid sample; measuring, with the detector, absorbance of the light of the second wavelength with respect to the fluid sample; determining, using a processor of the measurement device, an absorbance ratio of the fluid sample using both the measured absorbance of the light of the first wavelength and the measured absorbance of the light of the second wavelength; and providing, via an output device, a determined concentration value for the fluid sample that correlates to the absorbance ratio. Other aspects are described and claimed.
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公开(公告)号：US10006853B2
公开(公告)日：2018-06-26
申请号：US15486125
申请日：2017-04-12
Applicant: Hach Company
Inventor： Douglas Ford Royer , Charles C. Johnson , Andreas Golitz , Bas de Heij
CPC classification number: G01N21/0303 , G01N21/4785 , G01N21/51 , G01N2201/068
Abstract: An embodiment provides a turbidimeter standard ampule, including: a main part composed of glass and containing therein a formazin solution comprising a formazine polymer diluted in a solvent; the main part including a lens positioned in a bottom edge thereof and permitting entry of light from a turbidimeter; the main part having glass sides and permitting redirected light to exit the glass sides for detection by a photodetector of the turbidimeter; an upper part composed of glass and being attached to the main part; and an opaque cap on the upper part, the opaque cap blocking light from entering the upper part of the ampule. Other embodiments are described and claimed.
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