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  • ONTECH870 Liquid nitrogen refrigeration preconcentrator
  • ONTECH870 Liquid nitrogen refrigeration preconcentrator
  • ONTECH870 Liquid nitrogen refrigeration preconcentrator
  • ONTECH870 Liquid nitrogen refrigeration preconcentrator

ONTECH870 Liquid nitrogen refrigeration preconcentrator

Liquid nitrogen refrigeration Preconcentrator

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Hardware features:

1.  Unique three-stage cold trap technology, first-stage water trap, second-stage enrichment trap, three-stage deep cold focus trap;

2.  High-speed gasification, the heating rate reaches 2000 °C / minute, with the invention patent analysis technology, making the perfect separation of the compound while the peak type becomes narrower and higher;

3. Standard independent standard air inlet, internal standard inlet, carrying gas inlet and built-in sample have 13 injections (if do not use  built-in sampler, there is 3 injections); can also be used with external automatic sampler, increased to 28 air path, can be connected to SUMMA canister or air bag to realize the automatic injection function of batch sample;

4. Structural innovation, can save 20% of the liquid nitrogen;

5. Reliable structure design: the sample pipeline is fully inert treatment, from the sample joint to the internal solenoid valve body by whole high temperature heating, really do the whole sample heat companion, no cold point, no adsorption;

6. Concentration ratio is greater than 1000:1;

Software features:

1. Control software is simple to operate, powerful, especially for users without preconcentrated use experience, easy to use;

2.  High precision MFC electronic measurement, mature and reliable technology, unique algorithm design, can completely avoid the flow inaccurate problem when  the ordinary MFC start,  without vacuum canister, convenient to use, flexible;

3.  Method editing function is powerful and flexible, the running time process customization, can be based on different samples and analysis requirements;

4.  Perfect data recording and export function, and support various remarks;

5.  Can match any style of GC or GC-MS.

Three-stage cold trap

1.Primary water removal trap: -190 °C~ 300°C; maximum heating rate 360℃ / min;

2.Secondary enrichment trap:  -190 °C~ 300°C; maximum heating rate 360℃ / min;

3.Three-stage cold focus trap :  -190 °C~ 300°C; heating rate> 2000 ℃ / min

Sensitivity and concentration range

1. Concentration ratio:> 1000:1;

2. Lower detection limit: 0.1 ppbv;

3. Reproducibility RSD: ≤3% (over 90% of the compounds).

Working conditions:

1. Power supply: AC 220V± 10%, 50Hz;

2. Operating temperature: -10~50℃;

3. Relative humidity: ≤90%.

Sample processing capacity

1. All pipelines are made of silanized stainless steel;

2.Injection range: 4-2000ml, less than 4ml support quantitative ring injection;

3. MFC flow range: 5-100 ml/min, accuracy ± 2%;

4. Temperature control accuracy: first and second stage cold trap ≤±2℃, third stage cold trap≤±5℃

   Ontech860 Is an ultra-low concentration VOCs pre-concentration instrument . Using deep freezing of liquid nitrogen plus core cold trap technology, the concentration ratio is greater than 1000:1, Can match any type of GC or GC-MS, completely in accordance with 《HJ 759-2015 Ambient air-Determination of volatile organic compounds-Collected by specially-prepared canistersand analyzed by gas chromatography/mass spectrometry 》《HJ1078-2019 Stationary source emission—Determination of 8 organosulfur compounds including methanethiol—Bag sampling and preconcentration/gas chromatography mass spectrometry》and 《2019 VOCs monitoring scheme》 for the polarity (aldehyde, alcohol, ester, ketone, ether) and non-polar, sulfur compounds, nitrogen compounds and other volatile organic compounds. The unique hardware and software design promotes the more efficient processing of various gas samples. 

   Effectively preconcentrate the volatile and semi-volatile organic compounds of polar (aldehyde, alcohol, ester, ketone, ether), non-polar, active sulfur and nitrogen compounds with carbon number below C12, and effectively remove H2O, CO2, N2 and inert gas in the gas sample. It can be used for the injection and concentration of various sampling devices such as SUMMA canister and gas bag.


   Using the three-stage cold trap technology, the first cold trap efficient water removal; the second cold trap efficient enrichment, flash analysis;

   The three-stage focus trap is deep freezing, rapid gasification into GC, with the invention patent analysis technology. The equipment has advanced temperature control system, make the analysis more stable and accurate, peak perfect separation.

Liquid nitrogen refrigeration Preconcentrator

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