Kjeldahl is the main instrument for the determination of nitrogen content in samples and is currently used in a wide range of industries. As a high-precision measuring instrument, Kjeldahl has high detection efficiency and accurate detection results, but it is based on the standard operation. In the process of measuring with Kjeldahl, the user will also have some measurement problems. For example, some netizens ask, using the instrument to measure, the recovery rate requires 99.5%--100.5%, and the result is 101.5%, which is higher than usual. So what are the main influencing factors?
A: Generally speaking, the high recovery rate is mostly caused by the titration. The reasons may be as follows. The first is that the titration acid calibration is inaccurate and can be avoided by multiple calibrations; the second is that the sample volume has errors. The third is that the equipment has been modified and needs to be recalibrated. In addition, some netizens pointed out that the water used for distillation is not pure enough, or the standard hydrochloric acid titration solution has problems.
It must be said that there are many reasons for the high recovery rate of Kjeldahl nitrogen analyzer. To find out the problem, we must eliminate it one by one. In addition, in the process of using the instrument to determine, in order to obtain accurate measurement results, to avoid the above errors, before the operation, you should still understand the performance of the instrument, in strict accordance with the instructions and instrument operating procedures. After the specification operation, the cleaning and maintenance work should be done after the measurement is completed, so as to maintain the good performance of the instrument and obtain the desired accurate result.
At present, Kjeldahl nitrogen analyzer is divided into semi-automatic nitrogen analyzer and automatic Kjeldahl nitrogen analyzer . The automatic Kjeldahl nitrogen analyzer can not only automate the distillation, but also the titration can be completed automatically without manual operation. Therefore, the instrument is used. The measurement not only saves time and effort, but also can effectively avoid the problems of high recovery rate of Kjeldahl nitrogen analyzer. If necessary, this type of Kjeldahl nitrogen analyzer can be selected.
Double Wall Corrugated Pipe Extrusion Line is fully controlled by PLC computer. This pipe is mainly used for water drainage system. It features high and stable output capacity, and highly automatic operation. For HDPE, you can choose high efficient Single Screw Extruder. For PVC ,you can choose Twin Screw Extruder or Parallel Twin Screw Extruder. Forming system consists mold and corrugators. Mold blocks can be easily changed and they can be water or air cooling, inline socketing, high precision Cutting Machine . Machine is controlled by SIEMENS PLC systerm, highly automatic running.
Features below:
1. Adopts LY15 aluminum alloy material, containing 5% copper material, high strength, without shape change.
2. High precision pressure cost processing to make sure embryo material with high density, bubble free.
3. Big CNC machine will cutting and processing the inside of block shinning and pipe surface will be nice.
4. Supplying different kinds of currugator block design for option, and can produce the corrugated design as request.
Double-wall Corrugated Pipe Extrusion Line
Double Wall Corrugated Pipe Machine,Double Wall Corrugated Pipe Extrusion Line,Double Wall Corrugated Pipe Extrusion Machine,Double Wall Extrusion Line
KonRun Extrusion Machinery Technology (Ningbo) Co., Ltd. , https://www.konrunmachine.com