Hydrogen atoms are extremely small. This makes them able to penetrate solid materials. This process is called diffusing. Regardless of the thickness of the cell, hydrogen will eventually penetrate. Over time, this will cause deviations or even complete failure. Standard pressure sensors are therefore not suitable for measuring hydrogen pressure. The ATM pressure sensor from STS has a solution to this problem. As standard, this piezo-resistive sensor is made of stainless steel 316L, Titanium or Hastelloy, but for hydrogen applications the membrane is provided with a thin gold layer (approx. 1 micrometer). The hydrogen atoms cannot penetrate through this gold layer and thus affect the reliability of the measurement. Gold has a permeability that is 10,000 times lower than that of stainless steel and therefore provides much better protection against penetration. The standard process connection is G1/2” male thread with a completely flat membrane (flush). The sensor is of course available with ATEX approval for intrinsically safe applications and DNV/GL, Lloyds register, GOST and ABS approvals for shipping applications. Analog and digital outputs are possible, as well as IP68 versions. Areas of application are: hydrogen filling stations, engines, process industry, etc.
For more information see our website: https://aesensors.nl/producten-en-toepassingen/druk/piezo-resistief/
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