Meet international / national standard, adopt national standard Kjeldahl method: digest sample in concentrated sulphuric acid environment 、steam distillation in alkaline environment、boric acid absorption、indicator titration end-point color determinate method;
In June, 2007, Sonnen successfully developed the unique auto determining module for nitric nitrogen；
Sonnen is one of the drafters of China’s national standard GB/T22923-2008;
Sonnen is one of the drafters of the China's official standard JJF 109-2012 《Calibration Specification for Nitrogen Analyzer》;
The distillation procedure could be finished automatically: automatically add water, add alkali and distill, and automatically power-off and give sound reminder when the operation is finished.