Chemical digestion of samples is required for the photometric determination of COD (150 °C), TOC (120 °C), total chromium (100 °C), total phosphate (100 °C) and total nitrogen (100 °C). The required temperatures and reaction time can be selected by using the membrane keypad of the reactor AL125. The unit works at 3 different temperatures and 3 pre-set reaction times. When digestion is complete, the reactor automatically switches off and gives a corresponding LED indication with short beep alarm. The AL125 reactor is fitted with 24 holes for 16 mm Ø vials. Chemical digestion of samples is required for the photometric determination of COD (150 °C), TOC (120 °C), total chromium (100 °C), total phosphate (100 °C) and total nitrogen (100 °C). The required temperatures and reaction time can be selected by using the membrane keypad of the reactor AL125. The unit works at 3 different temperatures and 3 pre-set reaction times. When digestion is complete, the reactor automatically switches off and gives a corresponding LED indication with short beep alarm. The AL125 reactor is fitted with 24 holes for 16 mm Ø vials.