Traditional Kjeldahl Digestion Units for nitrogen analysis and protein determination, with an aluminum heating block that offers an excellent thermal homogeneity, with a maximum working temperature of 450 °C. DK Kjeldahl digestion unit series is a traditional aluminum block heating digester that offers excellent thermal homogeneity, with a maximum working temperature of 450 °C. The blocks temperature is controlled by dedicated microprocessor electronics. DK Kjeldahl units offer an excellent test precision and repeatability and are available in the following configurations: DK 6 (6-position with 250 ml tubes, Ø 42 mm) DK 6/48 (6-position with 250 ml tubes, Ø 48 mm) DK 8 (8-position with 250 ml tubes, Ø 42 mm) DK 20 (20-position with 250 ml tubes, Ø 42 mm) DK 20/26 (20-position with 100 ml tubes, Ø 26 mm) DK 42/26 (42-position with 100 ml tubes, Ø 26 mm)