GasMix generates calibration gas standards by dynamic dilution: mass flow controllers (MFCs) continuously blend a concentrated reference gas with a diluent to produce the exact concentration required, in real time and on demand. The method complies with ISO 6145-7.
GasMix is mainly used to calibrate, verify and adjust analyzers based on comparative methods (GC, µGC, process analyzers, CEMS, spectrometers, etc.). It is not limited to this: any application that requires accurate, on-demand gas mixtures can benefit from GasMix.
Yes. AIOLOS III, Hurricane, Nephos and GRack can all be customized to suit your final application. Adding channels, valves, a multiplexer, heated lines, external signals or communication interfaces is possible on request.
For its powerful, dedicated, in-house developed AlySoft™ software, which provides full traceability, easy operation, automation and automatic uncertainty calculation. Many options can be added to fit your application perfectly.
AURA II is an LPG vaporizer. An internal heated pressure regulator fully vaporizes the LPG sample to avoid any discrimination, and all downstream lines are heated to the point of delivery to keep the sample in the gas phase. Combined with Aiolos, it enables automated, multi-point calibration for GC/µGC and elemental analyzers per ASTM D6667/D7551.
LiqMix generates gas mixtures from a liquid phase, for compounds that are not available in standard gas cylinders (VOCs, alcohols, water vapour, etc.). GasMix is a gas-to-gas diluter and/or blender. Note: Nephos is the current generation of the LiqMix range.
The response of a mass flow controller depends on the gas being used, so each MFC must be characterized for the gas of interest. The K-factor adjusts the MFC response according to the gas, so any type of gas can be metered accurately. In GasMix, K-factor calculation and correction are automatic.
There is no single fixed value: the concentration uncertainty typically ranges from less than 0.1% to about 1%. It is calculated for each mixture from the individual flow uncertainty of each channel versus the flow value. Each MFC offers ±1% set-point accuracy and better than 0.1% repeatability (when operating between 10% and 100% of full scale), with NIST-traceable, 400-point factory calibration.
Yes. GasMix can generate mixtures down to the ppb level, and even lower. This depends mainly on the initial concentration of the cylinder to be diluted and on the GasMix configuration. In standard configuration it dilutes up to a factor of 10^4, and up to 10^8 in cascade mode.
There are no inherent concentration limitations; the system is simply configured to suit the application. Generating very low concentrations from a highly concentrated gas requires the cascade option, while low dilution ratios are achieved by selecting the appropriate flow controllers.
Flow rates are managed automatically by the software. The operator simply enters the initial concentration, the desired final concentration and, if required, the total flow rate; the software then calculates the individual flow rate of each channel needed to produce the mixture.
No specific maintenance is required. We recommend a calibration check every two years to verify and, if needed, adjust the mass flow controllers. Additional checks can be carried out more frequently using an external flow meter.
ISO 6145-7 recommends a verification, and recalibration when needed, every two years. Internal quality procedures may, however, require a different interval.
GasMix complies with the ISO 6145-7 method and, in many respects, exceeds its performance requirements. For example, its concentration uncertainty stated as a function of the concentration value. Every MFC is delivered with a NIST-traceable calibration.
Yes. Alytech provides full installation and commissioning of the GasMix system, either on site or remotely.
Yes. Out of the box, GasMix is ready to be started up and used. A comprehensive video and a concise, application-oriented manual allow a quick start, and AlyTech application chemists are available every day to support users online.
The installation and start-up package includes hardware installation, software training, and the development and adjustment of the first methods.
Yes. Alytech can provide on-site installation and training; one day is normally sufficient.
Nephos continuously injects a metered amount of liquid into a carrier gas flow. The liquid is fully vaporized into the gas phase at a controlled temperature, and heated lines up to the point of delivery prevent re-condensation.
Nephos combines a Coriolis flow meter for the liquid with a control valve on a vaporization chamber. The liquid and gas flow rates are automatically calculated and regulated by the software to achieve the target concentration.
Nephos is a LiqMix: it is the latest generation of the LiqMix range. Whereas the original LiqMix was developed step by step on demand, Nephos is a complete redesign that represents a genuine breakthrough in performance and usability.
Yes. Nephos can generate both organic vapours (VOCs) and water vapour (humidity).
Nephos is the ideal companion whenever calibration gases or other synthetic mixtures must be generated dynamically because they are not available in cylinders — for example when the compounds are unstable, too heavy or reactive. In many cases, Nephos is the only solution able to generate the required gas.
Almost all gases can be used, including aggressive gases (H2S, NH3, HF, NOx, VOCs…). Internal lines are 316 stainless steel with an inert coating and seals are in Kalrez®. On the liquid side, organics, water and alcohols are compatible; mixtures of saline solutions cannot be generated.
Purge the lines with an inert gas, then fit plugs on all gas inlets and outlets.
GasMix operates with an inlet pressure from 2 bar(g) to 8 bar(g), with 3 bar(g) recommended for general use.
Yes. Using the cascade dilution module, concentrations in the ppb range can be obtained from a pure cylinder. The maximum dilution ratio is 10^8 (from 100% down to about 10 ppb, depending on the balance gas).