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Hydrogen Grading and Blending

FLEXIM’s innovative non-invasive sound speeds measurement provides a safe and easy way to determine impurities in hydrogen, while simultaneously measuring the volume flow of the gas.

The simple clamp-on system consists of two sensors installed on the outside of the pipe. The sensors send ultrasonic signals back and forth between each other and measure their transit time. By taking the geometry of the pipe section into the equation, we can determine the sound speed.

Hydrogen among all gases has an especially high speed of sound, with makes it easy to detect traces of any other gas in it.

For all gases, the speed of sound is dependent on their mol weight. The heavier the molecules are, the lower the sound speed. In the case of hydrogen, the sound speed is 1320 m/s, whereas for common impurities such as nitrogen, oxygen, water or carbon dioxide the sound speeds are below 400 m/s.

This large difference in sound speeds allows us to pick up impurities from 600 ppm or 0.06 wt. % when combined with a pressure and temperature measurement. This makes it possible to check if the hydrogen is within the boundaries of the desired purity classes as per DVGW G 260 and DIN EN 16726.



Safe and certified.

Thanks to FLEXIM’s non-invasive technology, our technologically advanced solution offers maximum safety within the challenging hydrogen environment. No pipe work is needed, no additional gaskets must be added to the process, there is zero contact with the product and of course the system is ATEX zone 1/ FM 0 and IIC approved.

Crucially, ultrasonic measurement can be installed during running production, making it ideal for upgrading existing pipe systems without costly downtime. And because of its design with no moving parts and permanent acoustic coupling, once installed the apparatus is completely maintenance free.


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