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Automatic headspace sampler AHS-6890
Purpose and Applications A headspace sampler is a sample preparation device used in gas chromatography. Compared to other sample preparation methods, such as solvent extraction or thermal desorption, this method is...
Description
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Purpose and areas of application
A headspace sampler is a sample preparation device used in gas chromatography. Compared to other sample preparation methods, such as solvent extraction or thermal desorption, this method is simpler and more practical, with higher throughput and better reproducibility of chromatographic results. It is one of the preferred methods for trace analysis in gas chromatography and is widely used in the following fields:
1. Petrochemicals: analysis of volatile organic compounds in monomers, coatings and polymers;
2. Environmental Sciences: analysis of volatile halocarbons in drinking water and toxic volatile organic compounds in industrial wastewater;
3. Sanitation and epidemiology: analysis of residual quantities of fumigants and sterilization agents in medical devices;
4. Food industry: quality control of wines, vinegar, soy sauce; determination of residual acetaldehyde in packaging materials; analysis of residual amounts of extractants (for example, 6# solvent) in oils;
5. Perfumery and cosmetics industry and flavors: analysis of aromatic compounds in beer and tea;
6. Quality control of medicines: analysis of residual organic solvents in pharmaceuticals;
7. Forensic chemistry: determination of ethanol, ketones and aldehydes in blood and urine;
8. Other areas: eg determination of volatile organic compounds in soils.
Operating principle
The operating principle of the AHS-6890 automatic sampler is based on placing the analyzed sample in a hermetically sealed bottle and then heating it. As a result of heating, the volatile components of the sample pass from the sample matrix into the gas phase and reach equilibrium between the liquid (or solid phase) and the gas phase. Then an aliquot of the gas phase is taken from the upper space of the vial and introduced into a gas chromatograph for analysis, which makes it possible to determine the composition and content of volatile components in the sample.
Basic functionality and technical characteristics
3.1 Control and interface
Microprocessor control, liquid crystal display with hieroglyphic indication in Chinese, membrane keyboard, digital input of parameters.
Main functions:
1) Control based on a single-chip microcontroller, keyboard input, display of all parameters and current operating modes on the LCD display.
2) Three-channel independent heating: heating block for vials, sample injection system and transport line (capillary) for sample collection.
3) Three external events, 8-step time program, automatic programmable start capability.
4) Storage and quick recall of up to 9 preset analysis methods for quick launch.
5) Possibility of synchronous launch of a gas chromatograph and a chromatographic workstation, as well as external launch of the device based on an external event.
6) Keyboard silent mode.
7) Adjust the brightness of the LCD display depending on operating conditions.
8) Built-in self-diagnosis of control and display boards with display of faults.
9) Sound notification at the end of the time program.
10) Stopwatch function.
11) The heating line of the transport capillary is supplied with reduced voltage.
3.2 Temperature control range in the area of vials (samples)
From room temperature to 200 °C, step 1 °C.
3.3 Temperature control range of the transport line (capillary)
From room temperature to 160 °C, step 1 °C.
3.4 Temperature control range of the valve inlet system
From room temperature to 160 °C, step 1 °C.
3.5 Temperature accuracy
< ±0.5 °C.
3.6 Temperature gradient
< ±0.5 °C.
3.7 Pressure range for sample injection boost
0～0.4Mpa (stepless adjustment).
3.8 Number of positions for bottles
12.
3.9 Reproducibility (RSD)
< 3% (depending on GC characteristics and assay technique).
3.10 Vial volume (vial)
20ｍl (it is possible to produce bottles of 10ｍl, 50ｍl and other sizes upon request).
3.11 Injection system backflush flow and time
Smooth adjustment.
3.12 Dimensions
200×380×400ｍｍ3.
3.13 Device weight
About 20kg.
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