Abstract: The present disclosure relates to a method for diluting a sample liquid taken from a sampling point for the subsequent determination of a parameter which depends on a concentration of at least one analyte in the sample liquid, including: supplying a first quantity of the sample liquid to a mixing device via a first sample liquid line; supplying a second quantity of the sample liquid to a separator via a second sample liquid line; separating the analyte from the second quantity of the sample liquid supplied to the separator by means of the separator to obtain a dilution liquid that no longer contains the analyte, and mixing at least one portion of the first quantity of the sample liquid supplied to the mixing device via the first sample liquid line with at least one portion of the dilution liquid by means of the mixing device.

Abstract: The present disclosure relates to a method for operating an automatic analysis apparatus for determining a parameter of a sample liquid, including: flushing a measurement unit of the analysis apparatus with a first volume of the sample liquid; discharging the first volume of the sample liquid into a collection container containing a waste liquid mixture; producing diluted sample liquid by mixing a second volume of the sample liquid with a dilution liquid using a dilution unit; producing a reaction mixture of at least a portion of the diluted sample liquid and at least one reagent; detecting a measured value of a measurement variable of the reaction mixture in the measurement unit; and, after detecting the measured value, discharging the reaction mixture from the measurement unit into the collection container, wherein the dilution liquid is recovered from the waste liquid mixture contained in the collection container.

Abstract: Disclosed is a measuring arrangement for measuring the total nitrogen bound (TN) in a measuring liquid, comprising: a radiation source emitting UV radiation; a radiation receiver configured to generate a signal that depends on the intensity of radiation impinging on the radiation receiver; a vessel having a first opening and a second opening opposite the first opening; a first window closing the first opening; and a second window closing the second opening. The first and second windows are transparent to the measuring radiation. The measuring radiation emitted by the radiation source propagates along a measuring path which extends from the radiation source through the first window, the vessel, and the second window to the radiation receiver. The measuring arrangement also includes a heating element in thermal contact with the vessel wall.

Abstract: The present disclosure conveys a method for dosing an amount of liquid with a peristaltic pump in an analyzer, wherein the analyzer is configured to determine a concentration of a measurand of a sample, wherein the peristaltic pump includes at least one rotor having at least two rollers, the method comprising the steps: determining the position of at least one roller of the peristaltic pump; moving the rotor of the peristaltic pump to an initial position if it is not already in an initial position; and dosing the amount of liquid to be conveyed by moving the rotor by counting roller passes through a reference position. The present disclosure further discloses an analyzer for implementing the method.

Abstract: The present disclosure relates to a method of operating an automatic analysis apparatus for determining a parameter of a sample liquid which depends on the concentration of an analyte in the sample liquid on the basis of a first measurement variable detected by the analysis apparatus, wherein the analysis apparatus comprises an optical measuring transducer with a measurement unit, the method including: a) providing a reaction mixture comprising the sample liquid in the measurement unit; b) detecting a first measurement variable for determining the parameter; c) detecting a second measurement variable if step b) reveals that the concentration of the analyte in the reaction mixture is outside the measuring range of the analysis apparatus for detecting the first measurement variable; d) diluting the reaction mixture with dilution liquid as a function of the second measurement variable; and e) re-detecting the first measurement variable for determining the parameter.

Abstract: The present disclosure relates to a method for diluting a sample liquid taken from a sampling point for the subsequent determination of a parameter which depends on a concentration of at least one analyte in the sample liquid, including: supplying a first quantity of the sample liquid to a mixing device via a first sample liquid line; supplying a second quantity of the sample liquid to a separator via a second sample liquid line; separating the analyte from the second quantity of the sample liquid supplied to the separator by means of the separator to obtain a dilution liquid that no longer contains the analyte, and mixing at least one portion of the first quantity of the sample liquid supplied to the mixing device via the first sample liquid line with at least one portion of the dilution liquid by means of the mixing device.

Abstract: The present disclosure relates to a method for operating an automatic analysis apparatus for determining a parameter of a sample liquid, including: flushing a measurement unit of the analysis apparatus with a first volume of the sample liquid; discharging the first volume of the sample liquid into a collection container containing a waste liquid mixture; producing diluted sample liquid by mixing a second volume of the sample liquid with a dilution liquid using a dilution unit; producing a reaction mixture of at least a portion of the diluted sample liquid and at least one reagent; detecting a measured value of a measurement variable of the reaction mixture in the measurement unit; and, after detecting the measured value, discharging the reaction mixture from the measurement unit into the collection container, wherein the dilution liquid is recovered from the waste liquid mixture contained in the collection container.

Abstract: The disclosure concerns a method for operating an automated analyzer, including transporting a liquid containing a plurality of particles into a chamber, such as a reactor chamber and/or measuring cell chamber of the analyzer, introducing a gas or gas mixture, for example, air into the chamber, such as through the liquid present in the chamber so that the particles in the liquid are stirred up, and subsequently draining at least part of the liquid from the chamber through a fluid line ending in the chamber and an open valve arranged in the fluid line.

Abstract: The disclosure concerns a method for operating an automated analyzer, including transporting a liquid containing a plurality of particles into a chamber, such as a reactor chamber and/or measuring cell chamber of the analyzer, introducing a gas or gas mixture, for example, air into the chamber, such as through the liquid present in the chamber so that the particles in the liquid are stirred up, and subsequently draining at least part of the liquid from the chamber through a fluid line ending in the chamber and an open valve arranged in the fluid line.