Detector allows absorbance measuring at four wavelengths at the same time or scanning through entire spectra. System is controlled by built-in PC and touch screen. Modular solution allows to configure the unit according to customer needs. It can be equipped with one of three detectors with wavelength range 200 - 800 nm and also with one of three pump types with flow rate up to 50 or 250 ml/min. ECP2050 AND 2200 PREPARATIVE GRADIENT PUMPS It is UV-VIS diode array detector, which allow measuring absorbance of four wavelengths in range of 200-800 nm simultaneously in one cell just as scanning of whole spectra. Standardly is assembled with preparative cell PLCC07L, but other cells are available. Fractions are collected according to chosen method which is simply created using touch screen. Racks for 8, 21, 40 tubes, 60 ml vials or 12 funnels. Installed industrial PC with Intel Atom 4 core processor. OS Linux, SW QUEEN controlls: gradient, flow rate, wavelengths, fractions collection etc. Remote administration is available. Possibility of measuring at four wavelengths at the same time or scanning through entire spectra. Furthermore, the possibility of displaying 3D data. Modified for compact system, quaternary gradient pumps with flow rate up to 50 ml/min (30MPa) (and 250 ml/min (30 MPa at 100 ml/min and then linearly down up to 15 MPa at 250 ml/min). Unit software includes new learning algorithm for pulsation suppression and many testing and diagnostic functions. Six gradient valves allow to change mobile phases without bottles alternation. System modifications ECOM spol. s r.o. Trebonicka 239, CZ252 19 Chrastany u Prahy, Czech Republic