Does the gas pressure in your vessel change?

This can falsify the measured value in the case of a radiometric measurement, unless you have a gas density compensation from Berthold. With the feature GPC (Gas Property Compensation), a second measurement determines the current gas density in the vessel and compensates for the connected level measurement. Thus, a level measurement is realized, which provides an unaltered measured value even with fluctuations in the gas density. Find more information on our product page level measurement with