Gas Dilution and Blending

Generate Precise Gas Mixtures for Calibration Standards
Fuel Cell Test Station
•   Individual gas flowrates up to 2500 slpm per module
•   Modules can be combined to provide mixing from percent levels to ppb
•   Standard gas delivery modules provide 100:1 turndown of the gas (i.e.,
    from full scale to 1% of full scale)
•   Extended range gas delivery modules include dual MFC to provide 500:1
    turndown (i.e., from full scale to 0.2% of full scale)
•   Gas ratio control mode provides for automated blending of each gas as a
    percentage of the balance gas
•   Primary gas may operate in forward pressure mode so that blended gas is
    generated at the rate of consumption while blend-ins maintain their specified ratio
    to the primary gas
•   Real time display and logging of gas flow rates and setpoints for confirmation
    and record archiving
•   Software recipes can include not only fixed blending but dynamic blending with
    real-time scripting control
•   Optional fail-safe purge to provide fall-back gas flow under power loss or
    emergency stop conditions
•   High purity version available with metal seal flow controllers, valves, and
    connections
•   Options include external pressure sensor monitoring of feed gas, output,
    surge tanks, etc.


Flexible Control Modes

•   Total Gas Output with Mixing Ratio Mode
•   Tracking mode to provide target mixing ratio to a primary gas
•   Individual Flow Mode
•   Scheduled and Scripting Modes provide for unattended and fully automatic
    operation
•   Predefined Flow or Mixing Scripts provide for simple, automatic blending in thousands
    of stages
•   Surge Tank Mode where gas output is used to maintain pressure in a load-leveling
    surge tank
•   All modes provide real time charting and data logging of time, date, setpoints, and
    individual flows

Highly Modular, rackmount, plug-and-play gas blending system is not limited to a pre-configured number of gas channels.  Anytime in the future additional modules can be added by simply connecting the power, ethernet, and gas inlet/discharge.  Turn-key systems provide gas mixing, gas dilution using digital mass flow controllers for the highest precision with the minimim amount of calibration.

The module is further protected against obsolence since each mass flow controller contains calibration information for multiple gases providing for simple reconfiguration of a mass flow controller to a different gas without recalibration or resorting to correction factors.

Customer may specify from a variety of brands of digital mass flow controllers including Alicat, Brooks, Bronkhorst, and other popular brands.