Hydrogen has a large potential to be the fuel carrier of the future since it is environmentally friendly. However, the generation and storage of hydrogen poses problems that has to be addressed by ensuring correct material compatibility for safety and performance. Hydrogen is the simplest and smallest atom element and is found in water, acids, bases and organic compounds. Hydrogen atoms are not considered corrosive, however, if the atoms split into hydrogen ions (two H+ atoms), it can penetrate through thin metal diaphragms. It is important to ensure material compatibility when selecting components for hydrogen application since it will dictate the two major forms of corrosion: hydrogen permeation and embrittlement.

Hydrogen Pressure Sensors for Hydrogen Measurement and ControlTo overcome hydrogen permeability and embrittlement, American Sensor Technologies (AST) offers a complete line of pressure sensors for hydrogen service that employ one-piece thick diaphragm 316L diaphragms, free on internal O-rings, welds or fill fluids. Using Krystal Bond Technology, AST hydrogen pressure sensors are constructed with the most advanced MEMS process in the pressure sensor industry.

AST has obtained 79/2009/EC approval for two pressure ranges of its AST Model AST2000 and Model AST4000 OEM pressure sensors. The approval is a necessary European Community Directive for components and systems intended for installation on hydrogen-powered vehicles.

The 79/2009/EC approval was obtained for the 2MPa range of the Model AST2000 and Model AST4000 pressure sensors that are used as components on the vehicle hydrogen regulator controlling hydrogen flow to the fuel cell stack. Also approved are the 35MPa range of pressure sensors that are typically used on Class 3 hydrogen tanks for use on buses, forklifts, cars, farm machinery, off-road vehicles and stationary back-up power systems.

Features of AST2000/4000 Hydrogen Pressure Sensors

  • Krystal Bond Technology
  • High Strength Stainless Steel Construction
  • No Oil, Welds or Internal O-rings. No Oil-filled Cavities leave no chance of containment
  • Wide Operating Temperature Range
  • Ranges up to 10,000 PSI
  • Low Static and Thermal Errors. Digitally Compensated
  • Compatible with Wide Range of Liquids and gases
  • EMI/RFI Protection
  • UL/cUL 508 Approved, EC79 Approved and CE EN61326
  • Non-welded diaphragm eliminates leak paths and weak points

Applications of AST Hydrogen Pressure Sensors

  • PEM Hydrogen Fuel Cells
  • Hydrogen Fuel Cell Vehicles
  • Hydrogen Storage and Hydrogen Filling Stations
  • Hydrogen Pressure Test Stands
  • Industrial OEM Equipment and Control Panels
  • HVAC / Refrigerant Pressure Measurement
  • Water Pressure Sensors
  • Pneumatics Pressure Equipment
  • Hydraulic Pressure Sensors
  • Sub Sea Pressure Measurement Systems