UV-VIS LED STAND-ALONE DETECTORS LED20G FIX EX • SINGLE AND DUAL The LED20G FIX EX detectors with UV-VIS Light Emitting Diodes (LEDs) as the light source are standalone UV detectors for preparative and flash liquid chromatography, where it is needed to use an external cell connected by optic cables. The LED20G FIX EX detectors use unique ECOM patented technology that significantly improves the performance of these LED detectors. Why the ECOM LED20G series detectors have the best parameters on the market among LED detectors To explain the difference, the LEDs themselves typically have a peak wavelength tolerance of ± 5 nm and a spectral half-width of 10–20 nm. This is unacceptable for some applications, as e.g. FPLC, and it also causes nonlinearity. However, ECOM‘s solution allows to narrow the spectral bandwidth and to select the exact wavelength from the LED-diode spectrum. Thanks to this ECOM patented solution, which eliminated the spreading of light, the linearity of the detector is excellent. Comparison of spectral curve of ECOM LED20G FIX EX detector and LED diodes without ECOM solution: Comparison: Outstanding linearity of ECOM LED20G FIX detectors (R²linearity ≥ 0.999 up to 4 AU) Comparison: Outstanding of ECOM LED20G FIX EX and another competitor´ detecor detectors (R² ≥ 0.999 up to 3.5 AU) 2 - The other mostly sold competitors LED detector on the market 6 4 8 2 Concentration of Acetone in Water (Vol.%) Key features and benefits of LED20G FIX EX detectors • Sharp, high and symmetrical spectral peaks thanks to ECOM-patented technology • Excellent linearity • Excellent price-performance ratio • Compact device dimensions • Low cell heating due to LED´s low power supply (0.7 W) that allows use for peptide analysis or FPLC • Higher sampling speed • Sophisticated diagnostic software • Diodes with wavelengths of 254 and 280 nm, other wavelengths available on request.

TECHNICAL DATA Flow cell External cell connected via SMA 905 connectors Trebonicka 239 Chrastany u Prahy Czech Republic