Some control parameters require prolonged digestion times to evaluate and quantify their value photometrically. Analysis of COD, TOC, total phosphate and total nitrogen. For easy sample handling, the thermoreactor is fitted with 24 holes for 16mm diameter vials. The unit works at three different temperatures: 100, 120, 150°C, and three preset reaction times 30, 60, 120 minutes. When digestion is complete, the reactor automatically switches off and gives a corresponding LED indication with a short beep alarm.