Endress + Hauser Conducta Gesellschaft Fur Mess-u. Regeltechnik Mbh +co. Kg

Matthias Knoedler

Ralf Steuerwald

An apparatus for photometric measurement of the concentration of a chemical substance in a solution, wherein a cuvette is provided containing the solution The cuvette is transmissive at least in predetermined regions for electromagnetic radiation, wherein a transmitting unit is provided, which produces electromagnetic radiation in at least two wavelength regions and which radiates into the cuvette The electromagnetic radiation in a first wavelength region serves for measurement purposes and the electromagnetic radiation in a second wavelength region is used for reference purposes The electromagnetic radiation in the two wavelength regions takes the same path through the cuvette and through the solution At least one detector unit is provided, which is so arranged that it receives the electromagnetic radiation in the at least two wavelength regions following passage through the solution, and wherein a control/evaluation unit is provided, which determines the concentration of at least one chemical substance in the solution on the basis of the electromagnetic radiation detected in the two wavelength regions.

Device for photometrically measuring the concentration of a chemical substance in a solution to be measured

A device for photometric measurement of the concentration of a chemical substance in a solution, including: a lamp, which emits electromagnetic radiation in a predetermined wavelength range; a first receiving unit in a measuring branch (MB), which receives the radiation transmitted through the solution at a first wavelength; a second receiving unit in a reference branch (RB), which receives the radiation transmitted through the solution at a second wavelength; and a control/evaluation unit, which, depending on the conditions present at the measuring site, uses the intensity values determined either by the measurement branch (MB) or by the reference branch (RB), in order to control the intensity of the radiation emitted by the lamp, such that the resulting, measured values are highly plausible.

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Fellbach, Germany

Matthias Knoedler