First, add about 2/3 volume of distilled water to the nitrogen analyzer steam generator, add a few drops of sulfuric acid to keep it acidic, to avoid the ammonia in the water being distilled out to affect the result, and put a little zeolite (or capillary, etc.) to Explosion-proof boiling. This step is somewhat similar to the pre-digestion step of the Kjeldahl method and is cleaned with the appropriate reagents. Add about 20 mL of distilled water along the wall of the small glass to allow water to flow into the reaction chamber through the cannula, but the water in the glass should not be exposed, plug the rod-shaped glass stopper, keep the water seal and prevent air leakage. This step directly verifies that the cannula is usable.
Immediately after the steam occurs, the switch on the waste liquid discharge pipe is closed, so that the steam can only enter the reaction chamber, causing the water in the reaction chamber to boil rapidly. The steam is distilled out from the upper port of the reaction chamber through the nitrogen-fixing ball into the condenser to be cooled, in the condensation tube. Place a conical flask on the lower end to receive the condensate. Start from the time when the nitrogen ball is hot, continue to cook for 5 minutes, then remove the gas lamp. After the flushing is completed, the connecting rubber tube between the steam generator and the collector is clamped. Since the gas cooling pressure is lowered, the waste liquid in the reaction chamber is automatically drawn into the reaction chamber casing, and the waste liquid discharge port clamp is opened to discharge the waste liquid. The entire cleaning process is over here. After the cleaning process, the internal environment of the nitrogen analyzer has met the requirements for measuring the protein content. In addition, the components of the nitrogen analyzer have also been tested, and the gas leakage or other bad can be replaced in time. The part. Repeat the cleaning according to the above steps 2 to 3 times, then replace the conical flask with a boric acid-indicator mixture under the condenser tube so that the lower end of the condenser tube is completely immersed in the solution, distill for 1 to 2 minutes, observe the conical flask Whether the solution inside is discolored. If it does not change color, it means that the inside of the distillation unit has been cleaned.
The main characteristics of the nitrogen analyzer steaming:
1. The working water of the fixed nitrogen distiller can be tap water or distilled water.
2. The instrument adopts one-button operation. As long as the work button is pressed, the instrument will automatically add water, alkali and distillation according to the set amount.
3. There is an audible alarm after the sample is distilled.
4. The fixed nitrogen distiller adopts a high-performance imported alkali pump, which greatly prolongs the service life of the alkali pump.
5. Set a special cleaning button to clean the alkali circuit to avoid the generation of alkali crystallization.
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