Hach Lange Gmbh

Markus Hahn

Andreas Jonak

Michael Kussmann

Axel Leyer

Heinz Rudde

Andreas Golitz

Lothar Heidemanns

Claudia Rieger

Aurelia Stellmach-Hanulok

Manfred Battefeld

Markus Lenhard

Sebastian Minke

Andreas Mitreiter

Hans-Joachim Kumpch

Frank Steinhauer

Rolf Uthemann

Clemens Hanschke

Bas De Heij

Bernd Gassner

Michael Kueppers

Michael Küppers

Klaus Bittner

Andreas Schwenk

Aurelia Stellmach

Elk Fricke

Volker Baar

Michael Kussman

Sven Bergmann

Maik Heuwold

Michael Kuppers

Eik Fricke

Hans Joachim Kumpch

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

The invention refers to an optical measurement apparatus () with an optical device () and a liquid sample vessel () for measuring an optical parameter of a liquid sample () in the liquid sample vessel (), comprising a drying circuit circulating drying air for venting the sample vessel (), wherein the drying circuit comprises a mechanical water stop means () in the course of the drying circuit, the water stop means () comprising a conduit body () with a water-absorbing swelling element () arranged within the conduit body (). The water stop means is simple and inexpensive and reliably protects all elements downstream of the water stop means from a water ingress upstream of the water stop means.

Optical measurement apparatus

A nephelometric turbidimeter for measuring a turbidity of a liquid sample in a transparent sample cuvette. The nephelometric turbidimeter includes a cuvette chamber housing with a cuvette chamber having the transparent sample cuvette arranged therein, and a drying apparatus. The drying apparatus includes a cuvette chamber inlet opening which vents the cuvette chamber, a cuvette chamber outlet opening which de-vents the cuvette chamber, an air circulator which circulates air from the cuvette chamber outlet opening to the cuvette chamber inlet opening, and a drying body. The drying body is provided as a container of a hygroscopic agent defined by a drying substance which is arranged in a drying path between the cuvette chamber outlet opening and the cuvette chamber inlet opening so that air flows through the drying body.

Nephelometric turbidimeter and method for controlling the humidity of venting air in a nephelometric 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

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

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.

Method for determining parameters of a gas-selective electrode

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Kempen, Germany

Markus Hahn