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.
Hach Company | Date: 2015-07-21
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.
Hach Company | Date: 2016-02-09
An aspect provides a low slope electrode device, including: a low slope measuring electrode for placement in an external sample solution, said low slope measuring electrode comprising: an electrode disposed within a glass container including an internal buffer solution and at least partially enclosing the electrode of the low slope measuring electrode, the glass container having two pH sensitive regions; an external buffer container including an external buffer solution and at least partially enclosing one of the two pH sensitive regions; and a separating element that separates the two pH sensitive regions; wherein: a first pH sensitive region of the glass container permits charge flow between the internal buffer solution and the external sample solution; a second pH sensitive region of the glass container permits charge flow between the internal buffer solution and the external buffer solution; the separating element, the first pH sensitive region, and the second pH sensitive region establish a charge flow circuit through the internal buffer solution, the external buffer solution, and the external sample solution; and the charge flow circuit acts as a voltage divider for the low slope measuring electrode. Other aspects are described and claimed.
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.
Hach Company | Date: 2015-10-20
Described is a lab-on-a-chip device and a method of employing a lab-on-a-chip device for determining the concentration of species present in the water.
Hach Company | Date: 2015-04-16
An Anti-Terrorism water quality monitoring system for continuously monitoring a potable water treatment system and related potable water distribution network that provides potable water to a municipality, city, housing development or other potable water consumer. The system includes the collection of data from the water distribution system and from the water treatment facility and from advanced separation processes which are integrated into analytical instruments. The data collected are stored in a remote database on a remote server computer or bank of computers and accessible by Homeland Security or its designated agency. Preferred parameters of monitoring include the turbidity and disinfectant such as chlorine, hypochlorous acid, sodium hypochlorite, calcium hypochlorite, ozone, chlorine dioxide, chloramines, hydrogen peroxide, peracetic acid.
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_(2 )generated from any inorganic carbon in the sample as carbonates is flowed through the detector, and may be recorded. Subsequent to this step, the UV light is passed through the reaction chamber and CO_(2 )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, which may be a non-dispersive infrared detector, after the reaction chamber is sparged using a carbon dioxide free gas, and recorded.
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.
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.
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.