Hach Lange Gmbh

Michael Kussmann

Axel Leyer

Manfred Battefeld

Andreas Golitz

Markus Hahn

Lothar Heidemanns

Frank Steinhauer

Aurelia Stellmach-Hanulok

Andreas Mitreiter

Markus Lenhard

Andreas Jonak

Heinz Rudde

Claudia Rieger

Clemens Hanschke

Bas De Heij

Sebastian Goertz

Hans-Joachim Kumpch

Bernd Gassner

Michael Haeck

Michael Kueppers

Klaus Bittner

Hartmut Dräger

Kathrin Otte

Frank Thomas

Ulrich Schmitz

Torsten Seehaus

Toon Streppel

Silke Brubaker

Daniel Hofsommer

Wayne Boris Perdue

Hartmut Draeger

Michael Küppers

Sebastian Minke

Andreas Schwenk

Aurelia Stellmach

Nina Aleth

Barbara Haase

Volker Baar

Michael Kuppers

Wayne Perdue

Bernd GAßNER

Markus Dr Hahn

A flow velocity measurement arrangement () for determining the flow velocity of an electrically conductive liquid in a liquid line, comprising an air bubble injector () for injecting an air bubble into a liquid flow, a first electrical conductivity measurement cell () downstream of the air bubble injector () and upstream of a measurement line (), a second electrical conductivity measurement cell (') downstream of the measurement line (), an evaluation unit () which determines the flow velocity of the liquid in the measurement line () on the basis of the time-related characteristics of the conductivity measurement results of the two measurement cells (′).

Flow velocity measurement arrangement

A process water analysis sampling assembly includes an immersion probe having a first filter unit and a second filter unit which are fluidically separated from each other, a flushing liquid tank, and a fluidics control. The fluidics control includes a pump arrangement which is fluidically connected to each of the first filter unit and the second filter unit, at least two liquid pumps which are arranged to be mutually independent from each other, and a valve arrangement having plurality of switchable valves. The fluidics control controls a sampling and a flushing of the immersion probe. The fluidic control fluidically connects the flushing liquid tank to one of the first filter unit and the second filter unit and simultaneously connects an analysis unit to the other one of the first filter unit and the second filter unit.

Process water analysis sampling arrangement

The present invention relates to a water sampling immersion probe () for continuously filtering a water sample from wastewater (). The water sampling immersion probe () includes a distal coarse filter () with a porosity of 0.1 to 1.0 mm, a proximal fine filter () arranged downstream of the coarse filter () and having a porosity of less than 5.0 μm, and a sample suction opening () arranged downstream of the fine filter (). The coarse filter () is arranged to not contact the fine filter ().

Water sampling immersion probe

A method for determining a phosphate concentration in a water sample includes providing the water sample, adding a first acid to the water sample to obtain a second water sample in which a concentration of the first acid is at least 0.5 wt.-%, performing a first photometric measurement of the second water sample, adding a coloring component to the second water sample to obtain a third water sample, performing a second photometric measurement of the third water sample, and calculating the phosphate concentration from a difference between the first photometric measurement and the second photometric measurement.

Method for determining phosphate

A method for detecting a contamination of a cuvette of a turbidimeter. The turbidimeter includes a light source which emits a light beam directed to a cuvette, a scattering light detector, and a diffuser with a body and an actuator. The actuator moves the body between a parking position and a test position where the body is between the measurement light source and the cuvette, thereby interferes with the light beam, and generates a diffuse test light entering the cuvette. The method includes activating the actuator to move the body from the parking position into the test position, activating the light source, measuring a test light intensity received by the scattering light detector, comparing the test light intensity measured with a reference light intensity, and generating a contamination signal if a difference between a reference light intensity and the test light intensity measured exceeds a first threshold value.

Method for detection of the contamination of a sample cuvette of a nephelometric turbidimeter

A nephelometric turbidimeter for measuring a turbidity of a liquid sample in a sample cuvette. The nephelometric turbidimeter includes a measurement light source configured to emit an axial parallel light beam directed to the sample cuvette, a scattering light detector arranged to receive a scattered light from the sample cuvette, and a diffuser comprising a diffuser body and a diffuser actuator. The diffuser actuator is configured to move the diffuser body between a parking position in which the diffuser body does not interfere with the axial parallel light beam and a test position where the diffuser body is arranged between the measurement light source and the sample cuvette so that the diffuser body interferes with the axial parallel light beam and generates a diffuse test light entering the sample cuvette.

Nephelometric turbidimeter and method for detection of the contamination of a sample cuvette of a nephelometric turbidimeter

A turbidimeter for measuring a turbidity of a liquid sample in a sample cuvette includes a cuvette receiving device configured to position the sample cuvette in a defined cuvette position, a light source configured to generate a parallel light beam in the sample cuvette, an annular 45&#xb0; collecting mirror configured to surround the sample cuvette, a scattering body arranged concentric to the annular 45&#xb0; collecting mirror, a scattering light detector arranged to receive light scattered by the scattering body, and an annular 45&#xb0; concentration mirror arranged coaxially to the annular 45&#xb0; collecting mirror and optically opposite to the annular 45&#xb0; collecting mirror. The annular 45&#xb0; collecting mirror is arranged concentric to the light beam. The annular 45&#xb0; concentration mirror is configured to surround the scattering body.

Turbidimeter

A water analysis sensor electrode for determining an analyte in water includes a sensor electrode housing which is configured to be closed. The sensor electrode housing comprises an inner wall and an ion-selective sensor electrode diaphragm arranged at a lower distal end of the sensor electrode housing. An electrolyte solution is in the sensor electrode housing. A measuring electrode is arranged in the sensor electrode housing. A gas bubble is enclosed by the sensor electrode housing. A rigid rod element having a round cross section is arranged in the sensor electrode housing so that a continuous open capillary channel extends over a length of the sensor electrode housing between the rigid rod element and the inner wall.

Water analysis sensor electrode

A transport container system for a water analysis sensor cartridge includes a water analysis sensor cartridge configured to be interchangeable. The water analysis sensor cartridge comprises at least two different sensor membranes. A transport container cup comprises, for each of the at least two different sensor membranes, a separate moist chamber. Each separate moist chamber comprises one chamber opening and a specific humectant for each of the at least two different sensor membranes.

Water analysis sensor cartridge with transport container

A water analysis measurement arrangement for determining a concentration of ions and/or ionic compounds in an aqueous medium includes a closed buffer solution housing comprising a pH buffer solution. The closed buffer solution housing is configured to communicate with the aqueous medium via an electrolyte bridge. A reference electrode is arranged in the closed buffer solution housing. An amplifier ground is disposed on a ground electrode and is configured to directly contact the aqueous medium. A high-impedance amplifier comprises a first capacitive element arranged between the reference electrode and the amplifier ground. An AC voltage generator is arranged between the amplifier ground and the ground electrode. A measurement electrode is configured to directly contact the aqueous medium. A redundant unit comprises a separate low-impedance redundant electrode arranged in the closed buffer solution housing and a high-impedance redundant electrode amplifier comprising a second capacitive element to the amplifier ground.

Water analysis measurement arrangement

A method for determining a condition indicator of an apparatus includes providing an apparatus configured to measure at least two different technical parameters. A respective parameter value is determined for each of the at least two different technical parameters of the apparatus using at least one sensor configured to determine a respective parameter value for each of the at least two different technical parameters. A respective deviation value is determined for each of the parameter values with respect to an associated respective parameter reference value for each of the technical parameters. A respective deviation relevance value is determined from each of the deviation values using a respective parameter-specific deviation relevance function for each of the parameter values, the parameter-specific deviation relevance functions being different from each other. Using an indicator function, a condition indicator is calculated from the determined deviation relevance values. An overall condition of the apparatus is determined using the condition indicator.

Method for determining a condition indicator of an apparatus

A method for determining a condition indicator of a water analysis apparatus includes determining a respective parameter value for each of at least two different technical parameters of the water analysis apparatus. A respective deviation value of each of the parameter values is determined with respect to an associated respective parameter reference value for each of the technical parameters. A respective deviation relevance value from each of the deviation values is determined using a respective parameter-specific deviation relevance function for each of the parameter values, the parameter-specific deviation relevance functions being different from each other. Using an indicator function, a condition indicator is calculated from the determined deviation relevance values.

Method for determining a condition indicator of a water analysis apparatus

An immersion probe for water analysis includes at least one electrode configured to detect an analyte in water, a probe head with a probe head end side on which the at least one electrode is disposed, and a separate protective cap attached to the probe head so as to be removable in a distal direction. The separate protective cap includes a protective cap end side with an electrode opening and an air discharge nozzle. The air discharge nozzle is configured so as to cause air exiting the air discharge nozzle to sweep over the at least one electrode.

Immersion probe for water analysis, comprising an electrode for detecting an analyte in water

Feed devices for liquid samples serve to convey liquid samples, for example to convey a liquid sample from waste water in a waste water treatment plant so as to monitor the treatment process. Known feed devices feed continuously at relatively low speeds. Films may accrete in the feed line that hinder the feeding and may react with the liquid sample. Therefore, the feed line must be cleaned frequently. In view of this, it is the object of the invention to improve the handling and the maintenance of a feed device for liquid samples. According to the invention, this object is solved by the fact that the feed pump () feeds in a pulse-like manner and the feed pump () as well as the feed line () are configured such that the expansion volume of the feed line () during the feed pulse is at most 50% of the pulse volume. Thereby, the feed line is cleaned and kept free of accretions.

Feed device for liquid samples

Gas-selective electrodes in liquid analyzing devices have a characteristic curve K with a linear portion L and a non-linear portion NL. In the non-linear portion NL, the characteristic previously could only be estimated so that determinations of the concentration were rather inexact. According to the present application, the electrode is rinsed with an acid and the zero point voltage Uat the electrode is determined during the rinsing. Using the zero point voltage U, the non-linear portion NL of the characteristic K is determined with high precision so that even low concentrations c can be determined with great accuracy.

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Duesseldorf, Germany

Michael Kussmann