RayKol Auto EVA 12 is a nitrogen blow-down automated evaporation system that provides automated evaporation of up to 12 samples in parallel with endpoint detection. This automated nitrogen evaporation system uses vortex airflow generated from stable angled nitrogen blow, to constantly disturb the sample surface and lower its vapor pressure in order to gain gently rapid evaporation under water bath heating. Each sample position is equipped with optical sensor to precisely determine endpoint of concentration. User can have real-time monitoring to whole process through built-in touch screen, make it easier to access and observe.