Abstract: An embodiment provides a method for measuring a fluid parameter of fluid flowing in a channel, including: transmitting, using a transmitter of a device, directed energy carrying a signal toward a surface of a fluid in a fluid channel, so as to produce one or more reflections from the fluid surface; detecting, by at least one receiver of the device, one or more received signals associated with the one or more reflections so produced; and determining, based upon a measurement beam comprising characteristics of the transmitted and received signals, a fluid parameter to be measured using a processor of the device; wherein, a measurement beam characteristic is adjusted based on a distance from the device to the fluid surface. Other embodiments are described and claimed.

Abstract: A method of measuring nitrate concentration in an aqueous sample includes mixing the aqueous sample with a water-soluble thioether chosen to reduce nitrate in the aqueous sample to nitrite in the presence of a water soluble catalyst, and a water soluble reagent system adapted to interact with nitrite to generate a color; measuring color generation, and correlating the color generation to nitrate concentration.

Abstract: A fluid quantification instrument is provided according to the invention. The fluid quantification instrument includes one or more sensor probes and meter electronics in communication with the one or more sensor probes. The meter electronics are configured to receive one or more raw fluid measurements from the one or more sensor probes, process the one or more raw fluid measurements using a predictive system model to produce one or more optimized fluid measurements, and determine one or more fluid quantifications using at least the one or more optimized fluid measurements.

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.

Abstract: Methods for measuring chemical oxygen demand, a composition and a kit useful for measuring chemical oxygen demand, a method for calibrating a chemical oxygen demand analysis method, and a method for determining carbonaceous chemical oxygen demand are disclosed.

Abstract: An embodiment provides a method for measuring velocity of fluid flow in a channel, including: transmitting, using a transmitter, directed energy carrying a signal toward a surface of a fluid in a fluid channel so as to produce a plurality reflections from locations substantially spanning the entire width of the fluid channel; detecting, using a plurality of measurement beams, received signals from the plurality of reflections so produced; determining, based upon differences between transmitted and received signals, a plurality of localized velocities; and computing, from the plurality of localized velocities, a cross-sectional average velocity of fluid in the channel. Other embodiments are described and claimed.

Abstract: 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.

Abstract: An embodiment provides an apparatus, including: a cartridge including a base and a lid; at least one fluid line located between the base and the lid of the cartridge; at least one heating element located either on the base or the lid and aligned in intimate contact with the at least one fluid line; at least one heat sensing element in intimate contact with the at least one fluid line, where the at least one heat sensing element is spaced downstream from the at least one heating element; a supply of power to the cartridge; and a processor in electrical communication with the cartridge that executes a program of instructions to: operate the at least one heating element to produce heating of the at least one fluid line at a first position; and operate the at least one heat sensing element to detect the heat of a fluid within the at least one fluid line at a position downstream of the first position. Other embodiments are described and claimed.

Abstract: 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.

Abstract: A method of measuring nitrate concentration in an aqueous sample include mixing the aqueous sample with a water-soluble thioether compound including a chromophore group in the presence of a water soluble catalyst; measuring a color change, and correlating the color change to nitrate concentration.

Abstract: 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.

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.

Abstract: 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.

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.

Abstract: 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.

Abstract: 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.

Abstract: 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 CO2 generated from any inorganic carbon in the sample as carbonates is flowed through the detector, and may be recorded.

Abstract: A self-centering vial clamp is provided. The self-centering vial clamp includes a clamp body including a vial aperture and two or more jaw slots spaced around the vial aperture, two or more clamp jaws spaced around the vial aperture, with a clamp jaw including a vial contact face and one or more jaw projections configured to engage a jaw slot of the clamp body, and two or more lever arms coupled to the two or more clamp jaws. A lever arm of the self-centering vial claim is configured to be manually pivoted, wherein the lever arm translates the pivoting motion into a sliding motion of the corresponding clamp jaw. Interacting lever gears formed on the lever arms constrain the two or more clamp jaws to move substantially in unison during the manual pivoting, aligning the vial.

Abstract: 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.