KDN series nitrogen determination instrument adopts the principle of Kjeldahl nitrogen determination, which is carefully designed by the company's scientific researchers by absorbing the advantages of similar products at home and abroad. The instrument has stable performance and easy operation. The products are divided into two series: fully automatic and semi-automatic. Its heating method is also divided into two types, one is the use of foreign commonly used electric heating pipe heating method, its advantage is that it can be applied to different water sources. The other is the electrode type heating method, which can be applied to water sources with relatively low conductivity, but has the advantages of rapid heating and no need to set up water level control devices.
The KDN series digestion furnace adopts a pit type electric heating device, and is equipped with a digital display temperature control device or a Voltage regulation temperature control device. The sample can be digested in the digestive tube with the shortest digestion time. During the digestion process, harmful gases such as SO2 can be cooled and mixed with water through devices such as sewage pipes and suction pumps, and then discharged into the sewer. It can effectively suppress the escape of harmful gases.
The complete set of equipment can be used for the determination of protein content of grain, feed, food, dairy products, beverages, soil fertilizer, and other agricultural and sideline products.

According to the number of heating holes, the series of products are divided into: 4 holes, 8 holes, 12 holes, 16 holes, 20 holes, a total of 5 specifications.
The "C" type at the back of the model indicates that the microcomputer digital display temperature control method is adopted. The indication without suffix adopts the thyristor Voltage regulation and temperature control method.