If the Kjeldahl nitrogen analyzer is placed for a long time without adding alkali, the pipeline will be easily crystallized
5. Cleaning the alkali-adding pipeline The instrument is not used for a long time, the alkali-adding pipeline is easily crystallized and clogged, and multiple pipelines are corrosive. After each test, the alkali solution in the alkali solution tank is replaced with distilled water, and alkali is repeatedly added in the debugging interface to realize the cleaning of the alkali adding pipeline. Shanghai Haozhuang Instrument Co., Ltd. is a professional laboratory instrument equipment, biochemical instrument equipment, ultrasonic instrument equipment, test box experiment environment instrument equipment manufacturer, research and development, production, sales Haozhuang (LNB) brand instrument-intelligent constant temperature and humidity culture Box, sterile homogenizer, low temperature and constant temperature, welcome to consult and buy! Shanghai Haozhuang Instrument has first-class scientific and technological talents, carefully build high-quality instruments for you, customers are welcome to buy!
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Maintenance and care:
1. Distillation device After the sample measurement is completed, return to the debugging interface to select the distillation function and start distillation. The distillation will stop automatically after about 7 minutes. Select draining, drain the liquid in the receiving cup to complete the cleaning of the distillation device. At the same time, the titration device was also cleaned. After cleaning, the digestion tube is removed, the waste liquid is discarded, the safety gate and the drip tray are wiped off, and the lye remaining in the measurement process is removed.
2. Replacement of standard acid solution When using standard acid solutions with different concentrations, the remaining acid solution in the titrator of the instrument should be removed. Select the titration function under the debugging interface, titrate for 5-6 minutes, the old acid will be completely replaced by the new acid. Drain the standard acid in the receiving cup.
3. Regular cleaning Regularly clean the waste discharge device. If it is not cleaned for a long time, it will block the pipeline. Measure 25ml of acetic acid solution and 5ml of water, and use manual distillation for half an hour. The volatile acetic acid will remove the residual alkali on the inner wall of the waste discharge device.
4. Precautions After each replacement of the standard titration acid or receiver, and after repairing the instrument, the recovery rate of the instrument must be determined. Generally, ammonium sulfate is used for recovery rate analysis to ensure that the recovery rate is in the range of 99.5% to 100.5%, indicating that the instrument is normal and can be used for sample determination. 
