Precautions for Melting Point and Melting Rate Tester
Release time:
2022-11-28
Melting Point and Melting Rate Tester Precautions: 1. The melting point instrument should be placed in a dry, dust-free, and ventilated laboratory environment to avoid excessive humidity and dust pollution, which reduces the service life of the melting point instrument. The instrument must be usable with corrosive liquids such as acids and alkalis; 2. During the capillary sampling and analysis process, pay attention to avoid capillary breakage and hand injuries. If the sample produces toxic gases after decomposition, the instrument should be tested in a fume hood. During the test, avoid contact with the heating components to prevent burns; 3. After using the instrument, the temperature drops to room temperature. Before using the instrument, check whether the test tube sleeve and the furnace body need to be correctly assembled; check whether the light source output data is good.
Automatic Melting Point Instrument: The automatic melting point instrument is the development trend of the entire instrument. No matter how bad the reality is, the future will always be solved. Therefore, a supplementary introduction to the automatic melting point instrument is given here.
Features of Automatic Melting Point and Melting Rate Tester: 1. Integrated design, compact structure, easy to transport and place; 2. Color touch screen, more convenient operation, easy to observe the sample change curve in real time; 3. Can be connected to a computer, results are easy to store and query; generally linear heating, can meet a variety of heating options, including the following three temperature control and detection management systems, can simultaneously measure three different melting points of samples. When the cooling rate is less than 7.5min, the sample test speed is faster.
Precautions for using the automatic melting point and melting rate tester: 1. Dry the sample in advance and crush it into powder with a mortar. The capillary tube must be firmly filled, and the filling height is 3mm. When connecting the capillary tube to the instrument, it is necessary to remove the contaminants on the outer surface of the capillary tube to prevent contamination of the instrument and lead to detection failure. If the capillary tube is damaged or broken during the test, it should be removed immediately after power failure and cooling. 2. In the sample testing, the height of the same batch number should be the same to ensure the consistency of the student experimental research results; fill 5 pieces in the same batch, remove the maximum and minimum values after measurement, take the average of the middle values, and reduce the experimental system error; 3. The test environment temperature can be set not to exceed the temperature change range of the national instrument during operation (<300℃). Different linear heating rates result in inconsistent measurement results. Certain standards need to be formulated. The linear heating rate is 1 °C/min. The linear heating rate is 3 °C/min, and the initial temperature should be lower than the melting point of 9~15 °C. The test conditions should generally be determined through experiments. After measuring high-melting-point samples and then measuring low-melting-point samples, the low-melting-point starting operating temperature can be directly input, and the instrument will automatically cool down. When there is a reference sample, the reference sample can be determined first, and a certain initial temperature and heating rate can be selected for comparison and measurement according to the needs. The initial melting point reading of the reference sample can be used as a reference for the reference sample. The melting point standard can be used as a temperature transfer standard device, allowing students to correct the results analysis according to the readings of adjacent standards.
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