KDN-04A定氮儀是一款基于凱氏定氮法原理設計的實驗室儀器，廣泛應用于糧食、食品、乳制品、飲料、飼料、土壤、水、藥物、沉淀物和化學品等樣品中氨氮、蛋白質(zhì)氮含量的測定。該儀器主要由電加熱消化爐和蒸餾器兩部分組成。其消化爐采用井式電加熱技術，能有效縮短消化時間，提高消化效率，并且可以抑制有害氣體的外逸。蒸餾器采用電極型加熱方式，操作簡單，自動化程度高。KDN-04A定氮儀的測定范圍為含氮量0.05%-90%，測定精度高，相對差≤2%，平行差≤0.2%。其工作電壓為交流220V 50HZ，消化爐功率為1200W，蒸餾器功率為800W。整套儀器體積適中，便于實驗室擺放。

The KDN-04A Kjeldahl Nitrogen Determination Instrument is a laboratory device designed based on the Kjeldahl nitrogen determination method. It is widely used for measuring the ammonia nitrogen and protein nitrogen content in various samples such as grains, food, dairy products, beverages, feed, soil, water, pharmaceuticals, precipitates, and chemicals. The instrument mainly consists of an electric heating digestion furnace and a distillation unit. The digestion furnace adopts well-type electric heating technology, which can effectively shorten the digestion time, improve digestion efficiency, and suppress the escape of harmful gases. The distillation unit uses an electrode heating method, which is simple to operate and has a high degree of automation. The KDN-04A Kjeldahl Nitrogen Determination Instrument has a nitrogen determination range of 0.05%-90%, with high precision, a relative difference of ≤2%, and a parallel difference of ≤0.2%. Its working voltage is AC 220V 50HZ, with a digestion furnace power of 1200W and a distillation unit power of 800W. The entire set of instruments has a moderate size, making it convenient for laboratory placement.