Dual channel fully automatic secondary thermal desorption instrument

I. Overview

HLTD-A2seriesDual channel fully automatic secondary thermal desorption instrumentIt is a fully automatic thermal desorption instrument with electronic cold trap and secondary adsorption desorption function, capable of simultaneously desorbing two sample tubes. Realize fully automatic operations such as primary desorption, secondary cold trap focusing, and secondary desorption of dual channel sample tubes, solving the problems of poor peak shape and low desorption rate in primary desorption. At the same time, dual channel injectionImproved experimental efficiency, with the advantages of high work efficiency and cost-effectiveness compared to traditional thermal desorption.

IIDual channel fully automatic secondary thermal desorption instrumentperformance metrics

One desorption (adsorption tube) temperature control range: room temperature~420 ℃, step size 1 ℃

Six way valve injection system temperature and control range: room temperature~220 ℃, step size 1 ℃

Sample transmission pipeline temperature and control range: room temperature~220 ℃, step size 1 ℃

Secondary desorption (focusing tube) temperature control range: room temperature~450 ℃, step size 1 ℃, heating rate>3000 ℃/min

Cold trap (electronic semiconductor refrigeration) temperature control range: -40 ℃ to room temperature, step size 1 ℃, no need for liquid nitrogen refrigeration

Temperature control accuracy:<± 0.1℃

Temperature control gradient:<± 0.1℃

Gas path pressure resistance:>0.4MPa

Sample grade:24 digits*2 （48 digits)

Output: 2 desorption outputs, capable of simultaneously desorbing 2 sample tubes

Backflow rate: 0-100ml/min (continuously adjustable)

Simulated sampling flow rate: 100ml/min

Sample desorption, blowing, injection, and blowback time:

Sample desorption time: 0s to 1000min

Sample blowing time: 0s to 1000min

Sample injection time: 0s to 1000min

Backblowing time of pipeline: 0s to 1000min

Timing range: 1s-1000min

Timing error value:<0.1%

Analysis accuracy: RSD<2.5% (related to GC performance and operating techniques)

Adsorption tube specifications: diameter: Φ 6mm/Φ 6.35mm, length: 89mm

Synchronous signal output: 2 switch signals, with a linkage switch time of 1-2 seconds

Power supply: AC220V 50Hz

Power: 1000W (peak)

Instrument size: 700 × 350 × 540mm3

Instrument weight: approximately 45kg

3、 Main functions and features

1. The fully automated system is safe and reliable, and does not require personnel to be on duty

2. Modular design of software and hardware, compact structure

3. Can simultaneously desorb two sample tubes, dual desorption output, high work efficiency, high cost-effectiveness

4. Strong universal performance: can be used with all brands of gas chromatographs (GC) and gas chromatographs（GC-MS combined use

5. Simple human-computer interaction, easy operation, high degree of automation (software automatically completes the desorption and injection analysis process of all adsorption tubes), good sample repeatability

6. Equipped with a large touch LCD screen, the interface information is rich and complete, the operation is simple, the method parameters are set, the working status and running time are displayed in real time, and the temperature and operation commands are tracked throughout the process

7. Adsorption tube, injection valve, transfer tube, and focusing tube (cooling, heating) can all be individually controlled for temperature. There are 10 methods for editing, storing, and calling at any time, and one click automatic completion of sample analysis

8. The six way valve and transmission pipeline link have no transmission cold points, reducing sample loss. The six way valve injection method effectively reduces dead volume and ensures injection accuracy

9. The cold trap adopts semiconductor refrigeration and air cooling,The cooling temperature can reach -40 ℃ (at room temperature of 20 ℃)

10. Provide a synchronization interface that can start gas chromatography, mass spectrometry, and chromatographic data processing workstations simultaneously with sample injection, and can also be accessed externallyEvent program starts this device

11. The sample pipeline adopts imported silane treated inert stainless steel pipes and imported solenoid valves to reduce residual pollution

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

13. Automatic calibration of sample tray function,Easy replacement of injection needle

14. Simple sample processing: The sample tube is detachable, making it easy to carry and collect samples in the field

15. Integrated standard sample preparation function, integrated design

16. Integrated adsorption tube activation function, one click start fully automatic activation

17. Allow for secondary sample addition during the experimental process without the need for resetting or interrupting the original experimental sequence, flexible and convenient

18. Equipped with adsorption tube pre blowing function (for high humidity sampling environment) to prevent water vapor from entering the focusing tube and G of the thermal desorption instrumentThe chromatographic column of C effectively protects the instrument and equipment

19. Equipped with power on self-test and periodic self-test functions, with fault alarms and prompts, temperature overload protection function, leakage protection function, improving the safety factor of instrument use.

Common application areas and examples

1. Analyze the composition of volatile aroma and flavor compounds in food, and determine residual substances and pollutants in food

2. Analyze the composition of thermally degradable compounds in solid matrices, such as plasticizers, additives, monomers, etc. in polymer materials (the degradation products of these samples are determined by adsorption thermal desorption analysis, which is helpful for the investigation of arson cases)

3. Separate unwanted components from the sample matrix, such as residual solvents in pharmaceuticals, residual monomers in polymers, and other oligomers

4. purposefully collect volatile components in the sample matrix, such as polluted atmosphere, salt, and sugar. At present, the typical application is to monitor the environment and collect volatile organic pollutants (benzene derivatives, VOCs) in the air using adsorption tubes

5. Used for the analysis and determination of special solids and liquids (such as soaking cotton and placing it in a tube)

6. One thermal desorption, generally only used for lower boiling temperature components (C2~C13), inorganic andGas is not easy to make. If using a low-temperature adsorption trap (secondary pyrolysis)suck）Can achieve boiling point<C36 volatile sample

7. The combination of secondary adsorption pyrolysis and GC/MS has a wider range of applications, which can solve the analysis and determination of complex types of samples, including environment, materials, fuel resources, food, pharmaceuticals, polymers, and various other commodities

Partial standards suitable for thermal desorption gas chromatography:

•GBT 50325-2020Code for Indoor Environmental Pollution Control of Civil Building Engineering

•GBT 18883-2022 Indoor Air Quality Standards

•GB/T 33871-2017Total volatile organic compounds in toner（TVOC）Determination of benzene and styrene

•GB 18587-2001Indoor decoration materials The amount of harmful substances released from carpets, carpet liners, and carpet adhesives is x

•GBT 27630-2011Guidelines for Evaluating Air Quality in Passenger Cars

•GB 36246-2018Synthetic material surface sports field for primary and secondary schools

•HJ 583-2010Determination of Benzene Compounds in Environmental Air Solid Adsorption/thermal desorption-gas chromatography

•HJ 644-2013ambient air Determination of volatile organic compounds Adsorption tube sampling-thermal desorption/gas chromatography-mass spectrometry

•HJ/T 400-2007Sampling and determination methods for volatile organic compounds and aldehydes and ketones in vehicles

•HJ734-2014Determination of volatile organic compounds in fixed pollution source exhaust gas by solid-phase adsorption-thermal desorption/gas chromatography-mass spectrometry

•IEC 62321-8-2017Determination of certain substances in electrical technology products.第8part:Using gas chromatography-mass spectrometry(GC-MS),Equipped with thermal cracking/Gas chromatography-mass spectrometry for thermal desorption attachments(Py/TD-GC-MS)Determination of Phthalates in Polymers

•ASTM D7823-2016Use thermal desorption-gas chromatography/Standard Test for Low Level Adjusted Phthalates in Polyvinyl Chloride Plastics by Mass Spectrometrymethod

•ASTMD6196-2015Selective adsorbent for monitoring volatile organic compounds in the air,Standard implementation of sampling parameters and thermal desorption analysis conditionsregulations

ASTMD7339-2012 Standard Test Method for Determination of Volatile Organic Compounds in Carpet Emissions by Specific Adsorption Tubes and Thermal Desorption/Gas Chromatography