melting point apparatus

Melting point meters are mainly used to determine the melting point of crystalline organic compounds such as drugs, dyes, and fragrances, in order to determine their purity. Measurement method * in accordance with pharmacopoeia standards

The characteristics of the melting point meter are as follows:

1. Melting point meters are generally equipped with color touch screens, which are convenient for users to use;

2. Generally, it is a linear heating process that meets various heating options;

3. Including three independent temperature control detection systems, which can simultaneously measure samples with three different melting points;

4. The cooling rate is less than 7.5 minutes, and the sample testing speed is fast;

5. Real time display of sample change curve on color display screen;

6. RS232 interface, equipped with computer software, capable of external computer reverse control;

7. Can store up to 1000 detailed experimental data;

8. Compliant with pharmacopoeia and GLP requirements;

9. Independent integrated design, compact and easy to use.

Precautions for using melting point meter:

1. The sample must be dried as required, crushed in a dry and clean mortar, and the capillary tube should be struck with a free fall method to make the sample fill firmly. The sample filling height should be 3mm. The height of the same batch of samples should be * to ensure the accuracy of the measurement results.

2. After the instrument is turned on, it automatically defaults to the previous starting temperature, and the furnace temperature can be quickly set with the keyboard if it is higher or lower than this temperature.

3. Do not set the starting temperature beyond the instrument's operating range (<300 ℃), otherwise the instrument will be damaged.

4. The starting temperature of certain samples has an impact on the melting point measurement results, and certain operating procedures should be determined. It is recommended to insert the capillary tube 3-5 minutes in advance. If the linear heating rate is 1 ℃/min, the starting temperature should be 3 ℃ -5 ℃ lower than the melting point. If the linear heating rate is 3 ℃/min, the starting temperature should be 9 ℃ -15 ℃ lower than the melting point. Generally, the testing conditions should be determined experimentally.

5. Different linear heating rates result in inconsistent measurement results, requiring the development of certain standards. Generally, the higher the speed, the higher the reading value. The melting point readings for each speed range can be unified using experimental correction values. Samples with unknown melting points can be heated rapidly or at a high rate to obtain a preliminary melting point range before precise measurement.

When there is a reference sample, the reference sample can be measured first, and a certain starting temperature and heating rate can be selected according to the requirements for comparative measurement. The initial melting point reading of the reference sample can be used as the assessment basis. Units with melting point standards as temperature transfer standards can be corrected based on readings from adjacent standards.