Hydrogen and pressure sensors ? What must be observed?

When pressure sensors touch hydrogen, this often results in difficulties. Unfortunately, I frequently notice in my job that our customers are not aware of this prior to use. This is exactly why they often do not even tell us that their medium contains hydrogen. We only learn when we receive a complaint. But why do we get a complaint? How come especially hydrogen so critical to pressure sensors?
A basic rule is that a lot of metals become brittle when subjected to hydrogen. Hydrogen atoms that diffuse into the metal grid change the strength of the material. In the worst case, this results in cracks in the material. Or even to put it simply, the pressure sensor starts leaking or is totally destroyed. In the case of pressure sensors, specifically thin membranes required for measuring pressure play a decisive role. Atomic hydrogen will not only penetrate the metal, but also go through it by diffusion.
เกจวัดแรงดัน has several effects: When piezoresistive measuring principles are employed, it becomes critical if hydrogen reacts with the internal transmission medium or accumulates there. This initially only falsifies the measurement results, but can down the road also result in complete destruction of the sensor in individual cases. The addition of hydrogen also changes the instrumentation characteristics of the resistance structures of the measurement bridge of thin-film sensors. Despite being pressure gauge 10 bar , this technique leads to a detuning of the bridge at least temporarily, resulting in a falsification of the measurement signal.
However, the consequences described above occur in different materials differently. This means that the effects of hydrogen can be lowered substantially by selecting suitable materials.
Note
Further information on our pressure sensors and on the subject of hydrogen can be found on the WIKA website. If you use hydrogen because the medium, your contact will gladly recommend an optimum solution for the application.

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