Kjeldahl is a professional instrument for detecting the nitrogen content of samples based on the classical Kjeldahl method. It has been widely used in food processing, cereals, feed, water, soil, pharmaceuticals, tobacco, livestock, Soil fertility, environmental testing, medicine, pesticides, scientific research, teaching, quality supervision and many other fields. From the inspection principle, using the Kjeldahl tester to determine the nitrogen content of a sample requires digestion, distillation, and titration to calculate the nitrogen content of the three steps. Therefore, the main reason for influencing Kjeldahl measurement results is also Three steps. According to the analysis, the following are the main reasons that affect the Kjeldahl determination results: 1. During the digestion process, the digestion temperature is too low or the time is insufficient, the sample is not completely dissolved, and there is a wall-hanging phenomenon when the sample is digested. 2, hydrochloric acid or sulfuric acid standard solution for too long, resulting in inaccurate solubility. (It is recommended that the maximum period of time should not exceed 1 month and exceed the need to reconfigure) 3, Kjeldahl apparatus distillation device condensing pipe or splash tube damage, resulting in ammonia leakage. 4. Too little liquid has been collected and the receiver outlet has not been passed. 5, hydrochloric acid or sulfuric acid standard solution concentration is too high. (Manual titration is prone to low recovery) 6. Ammonia gas is easily escaped when the ammonia collection temperature exceeds a certain temperature. Therefore, in order to obtain accurate test results, in addition to selecting a Kjeldahl tester with a high performance-price ratio and stable performance, it is also necessary to perform instrument-related test and calibration before testing. In the process of operation, strictly follow Kjeldahl Nitrogen analyzer operating procedures, including the temperature settings when digestion, catalyst ratio rules, digestion time and so on. Each detail can affect the Kjeldahl result, so even though there are professional instruments as helpers, the process can't be sloppy.
What is Feeder on the placement machine? What is Feida on the placement machine? Feida is the main accessory of the placement machine. Its function is to mount the SMD patch components on the feeder, and the feeder provides components for the placement machine for patching.
In the placement machine, the feeder functions to supply the chip component SMC/SMD to the placement head in a regular pattern and order for accurate and convenient pickup, which occupies a large number and position in the placement machine. It is also an important part of choosing a placement machine and arranging the placement process. Depending on the SMC/SMD package, feeders typically have a variety of tapes, sticks, waffles, and bulk materials.
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