Secondary thermal desorption instrument

HL802 secondary thermal desorption instrument

Introduction to HL802 secondary thermal desorption instrument

The HL-802 secondary thermal desorption instrument is a special equipment for indoor air quality testing that is matched with a laboratory gas chromatograph. It can be used in conjunction with any universal gas chromatograph with a sampler on the left.

The instrument can use activated carbon adsorption tubes to collect air, and use secondary thermal desorption and direct injection to easily analyze benzene in the air. It can also use Tenax adsorption tubes to collect air, and directly use primary thermal desorption or secondary thermal desorption. The sampling method makes it very convenient to analyze TVOC (C6~C16) in the air. It is not only easy to operate and has high component separation, but also the method detection sensitivity and quantitative analysis accuracy are also greatly improved.

This equipment can also be equipped with a gas chromatograph to measure volatile harmful substances in workplace air and non-methane total hydrocarbons in ambient air in accordance with national occupational health standards. It can also be used to analyze trace amounts of volatile organic compounds in other solids, liquids, and gases. .

Instrument features:

1. You can use activated carbon secondary thermal desorption method to analyze benzene series or use Tenax tube secondary thermal desorption method (or primary thermal desorption method) to accurately analyze TVOC in the air, and the recovery rate of analyzed benzene can reach 99% above;

2. Can be connected to the gas chromatograph with the vaporization chamber on the left side of the instrument;

3. Quantitative analysis has high repeatability and relative standard deviation is less than 3%;

4. The detection sensitivity of the method for analyzing benzene has been improved;

5. All pipelines and valves are temperature-controlled and heated, and there is no residual loss of condensation in the sample. The cold trap uses semiconductor refrigeration and air cooling, which is small in size and has good refrigeration effect.

6. Easy to operate, the collection adsorption tube is sealed with graphite, the thermal desorption process is stable and leak-free, and the work efficiency is high.

Main technical performance

1.Temperature control

① Primary pyrolysis furnace: room temperature ~ 400℃ ±1℃, temperature control accuracy: ±0.1℃

②Secondary pyrolysis furnace: room temperature ~ 400℃±1℃, temperature control accuracy: ±0.1℃

③Switching valve: room temperature ~ 200℃±1℃, temperature control accuracy: ±0.1℃

④ Refrigerator: -20℃～＋10℃±1℃, temperature control accuracy: ±0.1℃

⑤Output pipeline: room temperature ~ 250℃, temperature control accuracy: ±0.1℃

2.Carrier gas control

① When using the carrier gas path for analysis, when using a large-diameter capillary column, the flow adjustment range is: 3 ~ 10ml/min, when using a packed column, it can reach 60ml/min;

②Carrier gas path for primary thermal desorption and refrigeration concentration adsorption, flow adjustment range: 50~100ml/min.

3. Sample tube specifications: U-shaped tube (Tenax-TA, activated carbon, composite, etc. can be selected as filler)

4. Recovery rate: >99% (activated carbon desorbs benzene)

5.RSD:＜3%

6. Linearity: >99.9%

7. Power: <500W

8. Size: 40*32*50cm (L*W*H)

9. Weight: 21kg