Introduction to the working principle and advantages of the secondary thermal analyzer
The thermal resolver uses an organic compound captured by a glass tube filled with an adsorbent, and then introduces them into a gas chromatograph, and these organic compounds are separated and measured by gas chromatography. Two stages of two adsorption tubes are used in the analysis process: first, the compound is retained in a high-capacity adsorption tube (sampling tube) by large-volume sampling, and then heated and resolved into the next-stage capillary focusing tube (first-stage analysis); In the second step, the sample enriched in the capillary focusing tube is again heated and analyzed and introduced into a gas chromatography capillary (secondary resolution). Using the capillary enrichment tube secondary enrichment analysis, the analyte enriched in the capillary focusing tube can be introduced into the gas chromatograph with a small carrier gas volume, the injection efficiency is improved, and a sharp compound peak shape can be obtained. The capillary focusing tube technology avoids water interference and enhances the analysis of polar compounds. The thermal resolver can be conveniently used in a variety of sampling methods, such as an air sampler using a dry battery to sample the external environment and then analyze it in the laboratory, or use a mobile thermal analyzer/gas chromatograph platform for on-site sampling analysis.
ATDS-3600A automatic secondary thermal desorption instrument produced by Beijing Huasheng Spectrum Instrument Co., Ltd., with fully automatic design, large-screen display, beautiful appearance and convenient operation, a new generation of automatic thermal desorption instrument. It has the following advantages over similar products:
1. Can automatically run up to 20 samples without the need for personnel to be on duty;
2. Power on self-test, fault alarm and prompt, automatically locate the sample tray;
3. Microcomputer program control, the main functions are:
(1) Method parameter setting, real-time animation display working status, running time;
(2) Sample area, injection valve and sample transfer tube, all three ways are separately heated and temperature controlled;
(3) Set the analysis program and press the run key to complete the entire sample analysis automatically;
(4) It has a variety of extended functions: it can increase the room temperature secondary desorption part or the low temperature secondary desorption part, the purge and trap, and the low temperature cold trap according to the user's needs;
(5) The GC and chromatographic data processing workstations can be started simultaneously, and the device can also be started by a foreign program;
4. With external loading gas adjustment system, the injection analysis can be carried out without any modification and change to the GC instrument, and the original instrument carrier gas can also be selected;
5. Through the time programming, automatic desorption, injection, backflush cleaning and other functions;
6. The sample transfer tube and the injection valve have automatic backflushing function to avoid cross contamination of different samples;
7. In order to make the imported gas chromatograph more convenient and accurate to use, the instrument is also equipped with a special interface for various imported instruments, which is convenient to connect;
8. For the active substance analysis, an elastic quartz tube can be selected as the sample transfer tube;
9. The needle is easy to change and can be connected to all types of GC inlets at home and abroad.
Main technical performance of ATDS-3600A automatic secondary thermal desorber
1. Sample area temperature control range:
Room temperature - 400 ° C in increments of 1 ° C, the heating power is about 200W;
2. Valve injection system temperature control range:
Room temperature - 220 ° C in increments of 1 ° C, the heating power is about 60W;
3. Sample transfer line temperature control range:
Room temperature - 220 ° C in increments of 1 ° C. Heating power is about 40 W
(For operational safety, the transfer line temperature control is powered by low voltage);
4. Desorption 2 Temperature control range:
Room temperature - 400 ° C
Set in increments of 1 ° C;
(heating rate > 2000 ° C / min)
5. Cold trap temperature control range:
-30 ° C - 50 ° C
Designed in increments of 1°C (with state-of-the-art electronic refrigeration unit, no liquid nitrogen cooling required)
6. Temperature control accuracy:
7. Temperature control gradient:
8. Sample position: 20 digits
9. Desorption recovery rate: >95% (related to components);
10. Backflush cleaning flow: 0 ~ 400ml / min (continuously adjustable);
11. Effective size of the instrument: 450 × 360 × 510mm3
12. Instrument weight: about 25kg.
Beijing Huasheng Spectrum Instrument Co., Ltd. manufactures and sells professional chromatographs and accessories
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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