Working principle, keyboard and operation method:

1Working principle:

The principle of the instrument is to place the sample to be tested in a closed container, heat and raise the temperature to evaporate the volatile components from the sample, and reach equilibrium in the gas-liquid (or gas-solid) phase. The upper gas is directly extracted for chromatographic analysis to detect the volatile components and content in the sample.

2Carrier gas:

Connect the carrier gas of the equipped chromatograph as the carrier gas of the headspace sampler to the "gas source" and test for leaks. Adjust the "Pressure" and "Carrier Gas" knobs on the panel to the appropriate pressure.

major function

1. Sample workstation: 16 positions;

2. Power on self-test, fault alarm and prompt;

3. Microcomputer program control, main functions include:

⑴ Method parameter setting, real-time animation display of working status, and running time;

⑵ The sample area, injection valve, and sample transfer tube are all separately heated and temperature controlled;

⑶ Set up the analysis program and press the run button to automatically complete the entire sample analysis;

⑷ It has multiple expansion functions: dynamic headspace, purge and capture, low-temperature cold trap;

⑸ The GC and chromatographic data processing workstations can be started synchronously, and the device can also be started using external programs;

4. Equipped with an external carrier gas regulation system, headspace injection analysis can be performed without any modifications or changes to the GC instrument. The original instrument carrier gas can also be used;

5 The use of pressure equilibrium injection technique for headspace injection can obtain narrow chromatographic peak shapes;

6. The sample transfer tube and injection valve have automatic blowback function, which avoids cross contamination of different samples;

7. In order to make it more convenient and accurate to use with imported gas chromatographs, the sample injection valve and key components used in this instrument are all imported parts, and there are also interfaces for various imported instruments, which are easy to connect;

8. For active substance analysis, an elastic quartz tube can be selected as the sample transfer tube;

9.The injection volume can be adjusted according to the concentration of the sample to be analyzed by the customer;

10.The injection needle is easy to replace and can be connected to all models of GC injection ports at home and abroad.

TECHNICAL INDEX

1. Temperature control range in the sample area: room temperature -220 ℃, set in increments of 1 ℃;

2. Temperature control range of sample transfer pipeline: room temperature -220 ℃, set in increments of 1 ℃;

3. Temperature control range of valve injection system: room temperature -220 ℃, set in increments of 1 ℃;

4. Temperature control accuracy:<± 0.1 ℃;

5. Temperature control gradient:<± 0.1 ℃;

6. Injection pressure range: 0-0.4Mpa (continuously adjustable);

7. Headspace bottle stations: 16;

8. Repeatability: RSD≤1.5%(200ppm ethanol in water);

9. Headspace bottle specifications: optional 20ml, 10ml;

10.Backblowing cleaning flow rate: 0-400ml/min (continuously adjustable);

11.Effective dimensions of the instrument: 450 × 360 × 510mm³；

12.Weight of the instrument: approximately 25kg;