Abstract: The invention is directed to a method for determining a sample filter clogging condition value (C) of an immersion filter probe (20) of a process water analyzer arrangement (10), with the method steps provided by a filter clogging condition determination module (60): driving the sample pump (40) for pumping a defined filtration volume (FV) flowing through the filter membrane (24) and detected by the water flow sensor unit (50), memorizing the filtration motor rotations value (FR) generated by the motor speed control (61) for pumping the defined filtration volume (FV), driving the sample pump (40) for pumping a defined non-filtration volume (NV) detected by the water flow sensor unit (50), wherein the non-filtration volume (NV) is smaller than the membrane distal bulging volume (MV), memorizing the motor rotations value (NR) generated by the motor speed control (61) for pumping the defined non-filtration volume (DV), and determining the sample filter clogging condition value (C) with the filtration motor rotat

Abstract: The invention is directed to a process water analyzer (10) for automatically analyzing a parameter of a water sample, comprising a process liquid reservoir tank (70, 72) with a process liquid (70?, 72?), whereas the process liquid reservoir volume (V70, V72) in the reservoir tank (70, 72) defines a reservoir liquid level (170, 172) at a reservoir liquid level height (h70, h72), a dosage chamber (30) fluidically connected to the process liquid reservoir tank (70, 72) and being positioned fluidically downstream of the process liquid reservoir tank (70, 72), a positive displacement dosage pump (20) fluidically connected to the top of the dosage chamber (30) for sucking the process liquid (70?, 72?) into the dosage chamber (30), whereas an air cushion (27) is always provided vertically between the dosage pump (20) and a liquid column upper level (1) of a process liquid column (lc70,lc72) with an effective vertical liquid column length (c70,c72) between the reservoir liquid level (170,172) and the liquid column up

Abstract: The invention is directed to a process water analyzer (10) for automatically analyzing a parameter of a water sample, comprising a process liquid reservoir tank (70,72) with a process liquid (70?,72?), whereas the process liquid reservoir volume (V70,V72) in the reservoir tank (70,72) defines a reservoir liquid level (170,172) at a reservoir liquid level height (h70,h72), a dosage chamber (30) fluidically connected to the process liquid reservoir tank (70,72) and being positioned fluidically downstream of the process 10 liquid reservoir tank (70,72), and a positive displacement dosage pump (20) fluidically connected to the top of the dosage chamber (30) for sucking in the process liquid (70?, 72?) into the dosage chamber (30), whereas an air cushion (27) is always provided vertically between the dosage pump (20) and a dosage chamber liquid level (1) in the dosage chamber (30), so that a liquid column (lc70, lc72) with an effective vertical liquid column length (c70,c72) is given between the reservoir liquid l

Abstract: A flow velocity measurement arrangement (10) for determining the flow velocity of an electrically conductive liquid in a liquid line, comprising an air bubble injector (82) for injecting an air bubble into a liquid flow, a first electrical conductivity measurement cell (30) downstream of the air bubble injector (82) and upstream of a measurement line (40), a second electrical conductivity measurement cell (30?) downstream of the measurement line (40), an evaluation unit (20) which determines the flow velocity of the liquid in the measurement line (40) on the basis of the time-related characteristics of the conductivity measurement results of the two measurement cells (30, 30?).

Abstract: The invention refers to a sample preparation arrangement (30) for preparing a water sample for a process water sample analyzer (70), the sample preparation arrangement (30) comprising an immersion filter probe (20) arranged in a water basin (12), the immersion filter probe (20) comprising a sample filter membrane (24), a peristaltic hose sample pump (40) for pumping a water sample from the immersion filter probe (20) to the process water sample analyzer (70), the sample pump (40) comprising a peristaltic pump hose (42) and a pump motor (46) driving a peristaltic pump rotor (44), a water flow sensor arrangement (50) being fluidically arranged in-line with the sample pump (40) and the water sample analyzer (70), a hydrostatic pressure memory (64) for memorizing a static hydraulic pressure (SP) caused by the vertical pump height (H) between the sample pump (40) and the water level surface (14?) in the water basin (12), and a pressure sensor (80) fluidically arranged between the immersion filter probe (20) and th

Abstract: An aspect of the present invention relates to a cuvette for a photometric measurement of a sample, the cuvette comprising: a sample container; and at least one photometer. Further aspects of the present invention relate to a method for a photometric measurement of a sample, a system for a photometric analysis of a sample and a method for a photometric analysis of a sample.

Abstract: The invention relates to an analysis preparation cuvette rack unit (10;10?) comprising a cuvette platform (20) for uprightly holding a sample cuvette (100;101) comprising a cuvette identification (111;111?) on a sample cuvette information carrier (110;110?). The cuvette rack unit (10; 10?) comprises a platform balance for determining the weight of the sample cuvette (100; 101) held by the cuvette platform (20), a reading device (16) for reading the unique cuvette identification (111; 111?) of the sample cuvette information carrier (110; 110?), a sample cuvette information carrier (110; 110?) and a sample cuvette information carrier (110; 110?).

Abstract: Disclosed is a process photometer arrangement (10) with a photometric cuvette unit (20) comprising a cuvette body (24) defining a cuvette cavity (25) and a combined sample inlet/outlet opening (34), a photometer light inlet window (60) and a photometer light outlet window (62). The cuvette body (24) is movably supported by a cuvette body support element (88) and the cuvette unit (20) is provided with a cuvette vibration device (80) for vibrating the cuvette body (24) to thereby quickly and homogenously mix a liquid sample volume (31) within the cuvette cavity (25) without any separate mixing element within the cuvette cavity. This allows a short mixing action within a microfluidic cuvette.

Abstract: A method for the determination of a plausibility of a measurement result of a determination of an ammonium content of an aqueous sample. The method includes providing a blue indole dye mixture of the aqueous sample, determining a first extinction value of the blue indole dye mixture in a first absorption region, determining a second extinction value of the blue indole dye mixture in a second absorption region, dividing the first extinction value by the second extinction value so as to obtain a quotient, and determining the measurement result to not be plausible if the quotient ? 1.1.

Abstract: A flow velocity measurement arrangement (10) for determining the flow velocity of an electrically conductive liquid in a liquid line, comprising an air bubble injector (82) for injecting an air bubble into a liquid flow, a first electrical conductivity measurement cell (30) downstream of the air bubble injector (82) and upstream of a measurement line (40), a second electrical conductivity measurement cell (30?) downstream of the measurement line (40), an evaluation unit (20) which determines the flow velocity of the liquid in the measurement line (40) on the basis of the time-related characteristics of the conductivity measurement results of the two measurement cells (30, 30?).

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

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: 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: 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.

Abstract: 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.

Abstract: A nephelometric turbidimeter with a cylindrical turbidimeter vial. The cylindrical turbidimeter vial includes a transparent vial body and a circular optical shielding configured to optically block an inside from an outside of the turbidimeter vial. The vial body comprises a transparent and flat bottom inlet window, and a transparent vial cylinder body. The vial cylinder body comprises a circular outlet window. The optical shielding is arranged axially above the outlet window of the vial cylinder body, over a part of an axial length of the vial cylinder body, and axially adjacent to a non-shielded part of the vial cylinder body which serves as the outlet window.