Fully automatic video melting point meter - Shanghai Benang Scientific Instrument Co., Ltd

NegotiableUpdate on 05/06

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Overview

The fully automatic video melting point meter is an instrument used for accurately measuring the melting point of substances, with a relatively simple operation process and high degree of automation. Select the appropriate form based on the characteristics of the sample (usually solid powder, particles, or small pieces).

Product Details

Fully automatic video melting point meterIt is an instrument used for accurately determining the melting point of substances, and its operation process is relatively simple and highly automated.

Operation steps of fully automatic video melting point meter:

1、 Preparation work

Sample preparation

Select the appropriate form based on the characteristics of the sample (usually solid powder, particles, or small pieces). If the sample is a large solid, it may need to be crushed first to ensure that the sample can be uniformly heated. For example, for block shaped organic compounds, they can be ground into fine powder using a mortar.

For samples with deliquescence or volatile components, drying or sealing treatment may be necessary to prevent the accuracy of melting point determination from being affected by changes in the sample during the testing process. For example, some salt samples containing crystal water need to be dried in a dryer for a certain period of time before testing.

Instrument preheating

Turn on the power and let the instrument preheat for a period of time, usually 10-30 minutes, depending on the instrument model and instructions. The purpose of preheating is to stabilize the heating components of the instrument and ensure temperature accuracy during the testing process.

During the preheating process, it is possible to check whether the connection of the instrument is normal, such as whether the video camera is clear and whether the temperature sensor is well connected to the instrument host.

2、 Set parameters

Temperature range setting

Set appropriate starting and ending temperatures in the instrument's control system based on the approximate melting point range of the sample. For example, if the melting point of a sample is known to be between 60-100 ℃, the starting temperature can be set to 50 ℃ and the ending temperature to 110 ℃, ensuring that the entire melting process can be fully recorded and observed.

For some samples with a wide melting point range, it may be necessary to appropriately expand the temperature setting range to ensure the accuracy of the test.

Heating rate setting

Choosing an appropriate heating rate will affect the accuracy of melting point determination. Generally speaking, a slower heating rate helps to determine the melting point more accurately, but it may prolong the testing time; A faster heating rate may lead to biased results. Usually, the heating rate can be set between 1-5 ℃/min, and the specific value depends on the properties of the sample and testing requirements.

For samples that are prone to decomposition or temperature sensitivity, a slower heating rate should be chosen, such as 1-2 ℃/min; For samples with low melting points and stable properties, the heating rate can be appropriately accelerated, such as 3-5 ℃/min.

3、 Loading of fully automatic video melting point analyzer samples

Loading samples

Carefully place the prepared sample in the sample pool of the melting point analyzer. The sample pool is usually a small metal or glass container, and its shape and size vary depending on the instrument. For powdered samples, a small shovel or spoon can be used to take an appropriate amount of sample and place it in the sample pool, ensuring even distribution; For granular or block samples, they can be placed directly or slightly crushed before placement.

Be careful not to let the sample overflow from the sample pool, so as not to affect the normal operation and measurement results of the instrument. At the same time, it is necessary to ensure good contact between the sample and the temperature sensor in order to accurately measure the temperature.

Cover the glass slide (if necessary)

Some melting point meters require a cover glass during the testing process to prevent the sample from splashing or oxidizing during heating. The material of cover glass is usually thin glass, and it should be handled with care to avoid crushing or damaging the sample cell.

4、 Start testing

Start the testing program

After confirming that the sample is loaded correctly and the parameter settings are correct, start the testing program through the instrument's control panel or operating software. At this point, the instrument starts heating the sample at the set heating rate.

During the heating process, the status changes of the sample can be observed in real time through a video window. The video system will transmit the image of the sample to the display, so that users can clearly see the process of the sample gradually transforming from solid to liquid.

Observation and Recording

When the sample begins to melt, carefully observe the melting behavior of the sample. The melting point is usually defined as the temperature at which a sample begins to exhibit a clear liquid state. Some samples may experience partial softening, discoloration, and other phenomena during the melting process, which can be used as references to determine the melting point.

The instrument will automatically record the temperature time data during the melting process and display the melting point result after the test is completed. Meanwhile, users can also manually record the observed key phenomena and corresponding temperature values for subsequent analysis and comparison.

5、 End test

Cooling and Cleaning

After the test is completed, let the instrument cool naturally for a period of time, usually waiting for 10-15 minutes, to lower the temperature of the heating components. Then, open the casing or sample chamber of the instrument and remove the sample pool and used samples.

For residual samples inside the sample pool and instrument, appropriate solvents such as ethanol, acetone, etc. can be used for cleaning. When cleaning, be careful not to damage the components of the instrument, especially precision parts such as temperature sensors and video cameras.

Data Processing and Reporting

Process and analyze the data recorded by the instrument, and if necessary, export the data to a computer for further processing or report production. The report should include information about the sample, testing conditions (such as heating rate, temperature range, etc.), melting point results, and observed phenomena.