This week Bronkhorst USA participated in the Fuel Cell Seminar & Exposition at the Henry B. Gonzalez Convention Center in San Antonio, TX.
Bronkhorst has expertise in the following fuel cell applications:
· Precise and fast Mass Flow Controllers for gases, e.g. for the control of Hydrogen and Oxygen in PEM fuel cell test beds, verification of catalysts, and accurate and repeatable gas mixture generation.
· Accurate and compact Mass Flow Controllers for liquids, e.g. for feeding Methanol to a DMFC (Direct Methanol Fuel Cell).
· Coriolis type mass flow meters for precise and fast measurement of reactant or exhaust gas flow, independent of gas composition or humidity.
· Flexible and accurate humidification of the air supply to a fuel stack, using a CEM evaporation system.
· Precise and reliable electronic (differential) pressure controllers, e.g. for stabilizing the pressure in the fuel cell against change of flow rate and maintaining a constant pressure difference across the membrane.
The available kv-values are 1.1 / 2.8 / 3.4 and 4.4. These valves consist of a brass body and IP54 protection. The electronics are connected to the flow meter with analog 4-20 mA control mode by the MFM. No additional external power supply is needed. 
These applications often do not need a very high control speed from 'fully closed' to 'fully open' due to 365 days - 24 hour steady continuous process so the control speed is sufficient in comparison to direct operated valves. These control valves are not shut-off valves and they are not 100% gastight.
