secondary thermal analysisThe instrument is a test analyzer with the advantages of strong sampling and analysis functions, stable performance, low volatility, high temperature resistance, thermal valve box, integrated design of gas circuit, and small size. These characteristics have great advantages over conventional thermal analyzers, and the detection of benzene or benzene is particularly useful in terms of detection accuracy and accuracy. Applicable to various research institutions. The laboratory. Food. Drug safety inspection department. Detection and analysis of organic compounds in air, water, soil, crops, beverages, desserts and other foods.

The function and principle of the secondary thermal analyzer:

The test air is introduced into the adsorption tube, and the appropriate adsorbent is selected according to the sample compound or mixture. After screening, the volatile components remain in the sorbent tube. In this way, the volatile components of the flowing air sample can be eliminated. The thermal adsorption tube desorbs the collected steam, and the sample and inert gas enter the capillary gas chromatography equipped with a flame ion detector.

secondary thermal analysisThe instrument is a two-way automatic direct sampling thermal desorption method. The airway is composed of an electric six-way valve and a solenoid valve, which can be automatically programmed to complete the desorption of the adsorption tube. Sampling. Blow back three processes. The heating temperature of the adsorption tube and the heating temperature of the pipeline can be set separately, the synchronization signal can be output during the sampling process, and the chromatography and the workstation can be started at the same time. The method proposed in this paper is suitable for various sampling methods, such as using a dry cell air sampler to collect the external environment, laboratory analysis or using a thermal analyzer for on-site sampling analysis. Trace organic compounds in cereals, fruit juices, chocolate, spices and other foods and their packaging materials, including air, water and soil.

Key features:

1. General: simple operation, fast heating, easy to use, the whole process is controlled by software.

2. The degree of automation is high. Put the sample tube into the pyrolytic absorber, and complete all operations and control through the control software. The sample has good repeatability.

3. Large touch LCD screen design, intuitive display, temperature tracking, operating instructions, provide synchronization interface, sample injection, gas chromatograph, chromatography station synchronization, and retain duplicate values.

4. The use of semiconductor refrigeration air cooling and liquid nitrogen-free refrigeration greatly reduces operating costs and fully meets most of the requirements of low temperature concentration.

5. Use direct resistance to heat the collector. Each pipe and six-way valve can control the temperature heating, eliminate the cold spot of the system, reduce the sample condensation loss, and improve the desorption recovery rate.

6. Good safety performance, the temperature of all transmission pipelines is powered by low voltage to eliminate potential safety hazards.

7. The secondary thermal analyzer should master the thermal desorption sample technology and be familiar with its main operating parameters: desorption temperature, desorption time and airflow velocity.

8. Desorption temperature: mainly control the heating speed and temperature. The heating speed is fast, the desorption speed is fast, the column is fast, and the initial peak band is narrow. But please pay attention to the appropriate upper temperature limit. When the heating stability of most polymeric adsorbents is higher than 300°C, there will be different degrees of decomposition and cracking, so the desorption temperature is usually used.