The Kjeldahl nitrogen analyzer is one of the instruments commonly used in many laboratories. It is very suitable for routine testing of nitrogen or protein content in laboratories and testing institutions.

There are three main types of Kjeldahl apparatus, namely the automatic Kjeldahl nitrogen analyzer with a high degree of automation, the semi-automatic Kjeldahl nitrogen analyzer with a limited degree of automation, and the glass Kjeldahl nitrogen analyzer with the longest application time. Among them, the glass Kjeldahl nitrogen analyzer is relatively fragile and cheap, so it is not safe to operate and has a limited detection range. The semi-automatic nitrogen analyzer is more stable than the glass analyzer, and can automatically add some reagents and complete distillation, but some reagents need to be added manually, so it is not as simple to operate as the automatic Kjeldahl nitrogen analyzer, nor as easy to use as the automatic Kjeldahl nitrogen analyzer.

The automatic Kjeldahl nitrogen analyzer is the most automated instrument among the common Kjeldahl nitrogen determination devices. It is a nitrogen analyzer that integrates distillation and titration. It is not only more convenient and safer to operate, but also can effectively reduce human error, greatly improving the efficiency of protein determination and the accuracy of determination results.