A monitor for the determination of the urea - content

摘要

A monitor for the photometric determination of the urea - content of a liquid, in particular in a dialysate as a control variable to a dialysis treatment, with– a uv - transparent by radiation cuvette to accommodate the liquid,– a to the cuvette, by means of radiation directed uv - radiation source for the provision of radiation in the case of at least two predetermined wavelengths, of which a first wavelength in a first partial range between 280 nm and300 nm, and at least a second wavelength in a second partial region of between 250 nm and 270 nm,– an at least in the case of the first and second wavelength sensitive photodetector means for receiving a absorption - measuring signal from the radiation cuvette and– a signal processing device for the correction - and / or calibration - processing of the photodetector signal in the case of the first wavelength with the photodetector signal in the case of the second wavelength, and for the calculation of the urea - content of the corrected or calibrated measuring result at the first wavelength.