The heart of the hydrogen measuring device is the sensor based on the principle of a fuel cell with a maintenance-free operating time designed for approx. 10 years. The measuring device has built-in self-diagnostics that monitor the function of the sensor without interrupting the measuring operation. Designed for a process pressure up to 40 bar, the Digox6.1 H2-S can measure dissolved hydrogen up to 10 ppm and in the gas phase up to 5 vol.-%. The Digox 6.1 H2-S is suitable for a wide range of industrial applications, such as in water-steam cycles, conventional and nuclear powered energy generators, chemical and petrochemical industries.