JHDN-6 semi-micro Kjeldahl is the company based on years of production of coal analysis instruments of rich experience, well-developed a new type of instrument, mainly used for the determination of nitrogen in coal. Coal nitrogen as an important element in coal, the combustion of nitrogen oxides generated air pollution is serious, easy to form acid rain, soil acidification, while nitrite is important carcinogens. In the power industry, the determination of the nitrogen content of coal can be used to calculate the heat of combustion of coal, theoretical combustion temperature, combustion and thermal balance of the composition of the product. Semi-micro Kjeldahl Instrument conditions: (1) Temperature: 0-40 ℃ (2) Relative humidity: ≤80% (3) Power supply: Voltage: 220 ± 22V Frequency: 50 ± 0.5Hz (4) load gas: helium, purity higher than 99.8%. (5) Power: no less than 4.5KW (6) no strong magnetic field interference semi-micro Kelvin Azotometer basic parameters: (1) Measuring range: 0.01 to 50% (2) Amount of sample: 100mg or so; (3). Single measurement time: about 35min; (4) Rated power: 4000W semi-micro Kelvin Azotometer technical requirements: (1) fixed repeatability (in line with GB / T 19227-2008) ≤0.08% (2) Temperature Accuracy : Setpoint ± 10 ℃ (3) Temperature range: Hydrolysis furnace: room temperature ~ 1200 ℃ steam furnace: room temperature ~ 500 ℃ retort furnace: room temperature ~ 500 ℃