Model RI-930 intelligent RI detector offers extremely low baseline noise and very stable baseline of 0.5 x 10 -8 RIU and less than 8 x 10 -7 RIU/hour under the conditions with flow cell filled with water and flow of THF with temperature change less than 1°C, respectively. The change of sensitivity range and the purging of reference cell can be done automatically by utilizing time-programming. In addition, temperature of heat exchanger is controllable in the range from 10°C above an ambient to 45°C.