Fusion Flow Solutions

Determining what's best for your application

Turn-key, Table-top Enclosed Systems

Modular Stand-alone Systems

What kind of information do we require when designing a bespoke gas mixing system?

To begin designing the optimal gas mixing system for your process, there are a few critical pieces of information we will need:

The desired total flow-rate output (or flow-rate range) of the mixed gas, in a standardized volumetric unit of measure, e.g. SCCM, SLPM, Sft³/m, SCFH, NmL/hr, etc.)

The available source pressure (or pressure range) of the feed gases in an absolute or gauge unit of measure, e.g. psi(G), mbar(A), kPa(G), etc.

The required delivery pressure (or pressure range) of the mixed gas in an absolute or gauge unit of measure, e.g. psi(G), mbar(A), kPa(G), etc.

The complete spectrum of individual gas types to be mixed using this system (including pre-mixed blends), e.g. Gas 1 =  Air, Gas 2 = O2, Gas 3 = Nitrous Oxide, Gas 4 = 500 ppm CH4 in balance N2, etc.

The intended gas mix ratio(s) (or ratio ranges), in % or ppm units of measure, e.g. 40% C2H6 + 35% Nitrogen + 25% Helium, 4000 ppm CO + 99.6% Carbon Dioxide, 0-50% H2 + balance Air, etc.

Q&A

No! The MXM gas mixing platform is an electronic/hardware based mixing system first, with an optional software component to enhance functionality and capability. If the process only requires a singular gas mixture and delivery mode, the MXM base unit can be run completely autonomously.

Yes! The MXM chassis can handle up to 6 independent gas channels, so if the system is originally ordered with only two mixing MFCs, up to 4 more MFCs can be added at later date (this requires the unit to be sent back to the factory for retrofitting). For the ‘–SA’ stand-alone models, up to 10 total gas controllers can be connected and configured to expand its capabilities (-SA systems do not  require anything to be sent back to the factory when adding channels). 

Not at this time. However, our sister company Perma Pure may be able to assist in providing a solution to humidify the dry blended gas stream created by the Fusion Flow MXM instrument. 

Technically, it is absolutely possible to make perfect, stoichiometric mixtures with the MXM. However, Fusion Flow Technologies does not condone the use of any of its product offerings for the purpose of creating explosive or flammable gas blends. Please contact us to discuss the details and available alternatives if these mixtures are required in your process.

Yes! If higher flow rates are required of the same gas within the mixture, the same gas source can be connected to as many available channels as needed to increase capacity of that gas. Further, these channels can be sized differently, allowing for a ‘high dynamic range’ of flow for that gas.

For example, Argon is assigned to a 5 SLPM unit as well as a 50 SLPM unit, allowing for a total possible Argon flow of 55 SLPM. Depending on the instantaneous requirement for Argon in the mixture, the MXM will choose to utilize either (or both) controllers to meet the demand, with the best accuracy and control possible.

No. The MXM is a dynamic blending system with multiple input ports, but only one common output port. The mixer can be set up to create unlimited mixture combinations using the available input feed sources. However, it can only deliver one mixture at a time via the outlet port. Multiple MXM systems would be required to create concurrent, yet differing gas mixtures. 

No. Because of the bespoke nature of the MXM platform, there are no options for classified/hazardous area usage with the MXM gas mixer.

Alicat Scientific does produce its ‘-X’ models for this purpose (see here: https://www.alicat.com/customize/hazardous-environments/), however, once these devices are combined electrically and physically within the MXM chassis, the ATEX ratings are lost. 

The MXM is designed to mix pure gases (elemental gases like Hydrogen, and compound gases like Air), as well as bulk supplied custom pre-blended gases (such as 5% Helium in balance Nitrogen).

Essentially, the MXM can track up to ten elemental gases, whether they’re coming into the instrument on ten individual pure feed sources, or by only two pre-blended, five-component sources.

For example, if the requirement is to further dilute a pre-mixed gas (such as 1% Methane in balance Nitrogen) with pure Nitrogen, the MXM will understand that there is Nitrogen present on the two separate channels, and automatically create the mixture as directed by the user (e.g. 500 ppm CH4 in N2). 

Conversely, the user could mix Air and Nitrogen, where the MXM has no knowledge of the N2 present within the Air component. In this case, the MXM treats the gases independently, without a calculated molecular result in the final blend (e.g. 50% Air + 50% N2; even though we know there would be much more than 50% N2 in the actual result).

Lastly, gases can be ignored and just tracked if they are unimportant to the final process, but are still a significant presence (>0.5%) within one or more of the feed sources’ compositions (e.g. the small Argon component within an Air feed source configured as an elemental mixture of 78% N2, 21% O2, and 1% Ar). In this example, no flow control decisions will be made to control the amount of Argon in the final blend; but it is tracked by the MXM nonetheless.

Yes, some corrosive and refrigerant gases can be connected to the MXM mixer, however special Alicat anti-corrosive models must be used for those channels, and anti-corrosive 316L stainless valves should be used on all adjoining standard units as well. For the standard list of available corrosive gases, please see here: https://www.alicat.com/knowledge-base/gas-select-gas-list/#g_tab-0-1 

and here for the standard refrigerant list: https://www.alicat.com/knowledge-base/gas-select-gas-list/#g_tab-0-1-vert- 

Additional gases not shown on these lists may be possible; please consult with the Fusion Flow Technologies application engineering team. 

The Fusion Flow gas mixers are primarily built with stainless steel. This includes the mass flow controller bodies, internal flow elements, fittings, tubing and manifold. There are additional wetted materials lists here, for various MFC types: https://documents.alicat.com/specifications/DOC-SPECS-MC-LOW.pdf 

https://documents.alicat.com/specifications/DOC-SPECS-MC-MID.pdf 

https://documents.alicat.com/specifications/DOC-SPECS-MC-HIGH.pdf

https://documents.alicat.com/specifications/DOC-SPECS-MCS.pdf

Contact Fusion Flow Technologies Today

Reach out to us with any questions you may have and our gas mixing experts will assist you.