Environmental Laboratory

  • Generate VOC calibration gas standards from a liquid

Generate VOC calibration gas standards from a liquid

Nov 08 2020 Read 205 Times

Available from Alytech, France the LiqMix Cascade is an accurate, automated, cost effective way for on-site generation of gas standards for chemicals that are not commercially available in cylinders, such as unstable, reactive compounds in complex multicomponent mixtures. Calibration gas such as BTEX in air, other hydrocarbons, acetone, siloxanes, ethanol and phenol, humidity standards can be produced in your lab tailored to your needs.

This innovative multi-stage cascade dilution system can generate a standard gas from pure liquids or liquid mixtures in wide concentration range from % down to ppb with good accuracy, high repeatability, and full traceability. This makes the LiqMix Cascade a simple and reliable metrology tool to perform multi-point calibrations, linearity, and hysteresis checks, LOQ / LOD validation of gas sensors, GC or GC/MS systems and many other purposes. Liquid micro flow is delivered into a vaporizer precisely measured by Coriolis massflow controller where it injected into a flow of a carrier gas (air, N2, H2, He, … ). The Coriolis technology is virtually independent of liquid properties (temperature, density, conductivity, and viscosity) and can handle any liquid or liquid mixture without a need for a specific calibration very accurately.

To achieve very low concentrations a portion of homogenous gas/vapour mixture is delivered to the second dilution stage, so-called Cascade, where it is further diluted to desired ppb concentration. All interconnections and outlet line of LiqMix are heated in order to maintain the vapours in gas phase and thus avoiding re-condensation up to the delivery point.

Easy to handle, dedicated AlyTech GasMix software controls the operation, manages mass flow controllers, its calibration tables, performs automatic calculation of liquid and gas flows, to achieve desired concentration of analytes even for very complex multicomponent mixtures. Following highest metrology requirements the instrument not only accurately prepares the gas mixtures, but it also automatically calculates and reports maximum relative uncertainty for every delivered concentration.

Enhanced communication features of the software and automated programmed sequences enable full automation by synchronising the calibrator with a gas chromatograph, pre-concentrator, spectrometer, gas analyser or other system dramatically reducing labour time of analytical chemists.

The LiqMix Cascade saves a considerable amount of money and time by producing on-site calibration gas or customized gas mixtures for your specific needs.


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