KDN-04A定氮仪是一款基于凯氏定氮法原理设计的实验室仪器，广泛应用于粮食、食品、乳制品、饮料、饲料、土壤、水、药物、沉淀物和化学品等样品中氨氮、蛋白质氮含量的测定。该仪器主要由电加热消化炉和蒸馏器两部分组成。其消化炉采用井式电加热技术，能有效缩短消化时间，提高消化效率，并且可以抑制有害气体的外逸。蒸馏器采用电极型加热方式，操作简单，自动化程度高。KDN-04A定氮仪的测定范围为含氮量0.05%-90%，测定精度高，相对差≤2%，平行差≤0.2%。其工作电压为交流220V 50HZ，消化炉功率为1200W，蒸馏器功率为800W。整套仪器体积适中，便于实验室摆放。

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.