Technical articles


When a designer get in charge a new project, first thing is to check what it’s available on then marker : when the new project is a gas divider he search which available devices do control the gas flows. Many manufacturers do produce MFCs and what is needed to convert two MFCs into a gas divider is just some software and few connections : the choice of MFC technology is nearly natural and in fact 90% of the gas dividers production uses it. Incidentally we too did start ago with it.

Is it the best choice ? we believe not, for many reasons that we try explaining in the following literature. In fact, now we are number one in gas dividers using capillaries techniquesure having made the right choice.

Equal capillaries advantages

Equal capillaries based gas diluters may be biult with the higher accuracy when compared with all the other techniques : this is due to advantages in gas diluter “calibration”.  Calibration process for a capillary type diluter is all in the capillaries selection process : in this process the fact of having to repeat measurements in the same narrow band is the origin of such advantage.  Here we see why.

Equal capillaries selection process

A good selection process of the equal capillaries and a careful execution are the basis for the high performance in our diluters: here are shown the main elements, including different equipment that we have developed and realized to reduce uncertainties with  the most important but also the dullest of our activities.  The production potential too is greatly increased.

Advanced compensations and corrections

BetaCAP30 e BetaCAP30X100 do use the Automatic pressures control function with calculated set point to perform compensation (of viscosities) and correction (of certified errors). A final empyrical function corrects the effect of real gases versus ideal and of real (not fully laminar) flow in the capillaries.

Self-referring calibration for BetaCAP60-3G

The three inputs gas divider BetaCAP60-3G is in the lucky contition of having two equal modules, each with equal capillaries: this quality had been used to setup a free PC software that may check and (if requested) correct the non linearity diluter errors. This is done with the help of an optional module with laminating flow elements and low range pressure meter The advantage of this technique is that the measuring instruments are absolutely not required to be linear or accurate, but the calibration it is : check to believe !

PowerPoint presentation of Self-referring calibration

The above textual description is accurate, but it requires some time to digest it : for faster readers we offer the PowerPoint presentation : with more images and less text it’s faster.