GasMix™ technology :

GasMix™ is based on mass flow controllers (MFC). The principle of mixing and diluting relies on the control of gas flows, according to the ISO 6145-7 standard.

A software continuously monitors , via a RS485 link, mass flowmeters to ensure flow rates and therefore concentrations, stable throughout the mixing creation. This software enables you configure and control the hardware. It also provides continuous monitoring of the steering while recording the dilutor feedback information, in order to trace any errors during production of the blend.

The uncertainty associated with the final concentration is calculated by the software based on the used flow and the initial concentration uncertainty.

With an external contact output, the software may be pending or send a signal, for example to control an external valve or start an analyzer.

 

 

 

 

 

 

 

 

 

The ISO 6145-7: 2009 is part of a set of International Standards dealing with dynamic volumetric methods used for preparation of calibration gas mixtures. Part 7 specifies a method for continuous production of calibration gas mixtures with two components at least, from pure gases or other gas mixtures, using the thermal mass flow controllers available on the market.

If this method is used for the preparation of calibration gas mixtures, optimal performance is the following:

the U relative expanded uncertainty of measurement ,obtained by multiplying the standard uncertainty by a k = 2 coverage factor, is not greater than 2%.

If premixed gases are used instead of pure gases, it is possible to obtain lower than 10-6 molar fractions. The measurement of mass flow being then not specific enough, the flow controller must be calibrated independently.

This method main advantage is allowing continuous preparation of large quantities of a gas mixture and making the preparation of mixtures with several constituents as simple as mixtures with two components only, provided that the right number of thermal mass flow controllers are used.

 

PAC-Antek analyzers technology:

 

• The MultiTek™ analyzers are the result of 40 years of experience in chemiluminescence (1976: Antek Total Nitrogen analysis patent) and 30 years of sulfur analysis by UV fluorescence. Antek was the first manufacturer to offer the analysis of sulfur and nitrogen in the oil samples in a single shot: 1 Injection → 2 Results.

 

• The very high sensitivity of the analysis by chemiluminescence have been exploited by other techniques. Thus was born the nitrogen specific detector for HPLC and specific detectors of sulfur and nitrogen dedicated to GC.