Hach Company

United States

Hach Company

United States
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Patent
Hach Company | Date: 2017-04-05

A portable apparatus and corresponding method for determining a concentration of an analyte in a fluid sample to assess a property of the fluid (e.g. hardness of water) are disclosed. The method comprises: 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. The absorbance may be measured at 510 nm and 655 nm and the determined concentration may be reported in the range of 3-100 ppm. The determined concentration value may be water hardness value.


Various turbidimeters are described that can detect light directly in a substantially circular, e.g., encompassing, manner such that an increased amount of scattered light from a sample vial may be detected by a light detector, e.g., a photodiode or photodiode array. In an embodiment, a substantially circular photodiode array is provided to directly detect scattered light in an arc about the sample vial. In other embodiments, light guides are provided in an arc element that guides light to a detector or detectors. Other aspects are described and claimed.


Patent
Hach Company | Date: 2017-03-29

A method for determining the total organic carbon in a sample (22) which includes mixing the sample with a reagent (32) 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. The sample is first injected into a reaction chamber (16), which is continuously flushed with carbon dioxide free gas with no UV light present, and CO2 generated from any inorganic carbon in the sample as carbonates is flowed through the detector, and may be recorded. Subsequent to this step, UV light is passed through the reaction chamber and CO2 generated from the reaction of the at least one oxidizing agent with the organic material in the solution in the presence of ultraviolet radiation, is flowed through the detector (20), after the reaction chamber is sparged using a carbon dioxide free gas, and recorded.


Patent
Hach Company | Date: 2017-05-31

An apparatus can include a controller; memory accessible to the controller; a bus operatively coupled to the controller; sensor circuitry operatively coupled to the bus where the sensor circuitry generates measurement information representative of an environmental condition; and where the controller determines codes, each of the codes representative of an individual operational state of the apparatus, and where the controller associates, in the memory, at least a portion of the measurement information with at least one of the codes.


Patent
Hach Company | Date: 2017-02-15

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: 2017-02-21

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.


Patent
Hach Company | Date: 2016-09-30

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.


Patent
Hach Company | Date: 2016-10-28

A standard for testing measurement systems for aqueous chlorine species analysis includes an openable storage vessel and an aqueous composition including a compound having the formula R_(1)R_(2)NCl where R_(1 )and R_(2 )are independently methyl, ethyl or propyl, wherein the aqueous composition is storage stable within the openable storage vessel.


Patent
Hach Company | Date: 2016-03-18

One aspect provides a system, including: a sensor adjustment component having: a memory device having adjustment information stored therein; a light engine capable of producing a signal detectable by a light detector of an optical sensor to be adjusted; and one or more processors; where the one or more processors are configured to execute program instructions to operate the light engine to produce a predetermined light pattern detectable by the light detector of the optical sensor to be adjusted; where the predetermined signal pattern comprises the adjustment information; and where the adjustment information configures said light detector that receives said predetermined signal pattern carrying the adjustment information. Other aspects are disclosed.


Patent
Hach Company | Date: 2016-09-01

A data logging monitoring instrument and related methods are described. One aspect provides a particle counting instrument, including: one or more sensors; a storage system; and a processing system coupled to the storage system, the processing system being configured to accumulate measurement data ascertained via the one or more sensors in the storage system into one or more log files; wherein the one or more log files are stored in a secure file format that is compatible with other non-particle counting instrument information processing device applications. Other embodiments are described.

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