prEN 12405-2

Gas Meters - Conversion devices - Part 2: Energy Conversion prEN 12405-2

Scope

To draft a European standard to specify the requirements and test methods for construction, performance, safety and conformity of electronic conversion devices associated to gas meters, used to measure volumes of fuel gases of the 2 nd family according to EN 437, intended to convert gas volume into gas volume at base conditions or gas mass or into energy.
Five kinds of conversion devices will be treated :
- conversion to volume at base conditions or mass as a function of temperature only (called T conversion),
- conversion to volume at base conditions or mass as a function of pressure and of the temperature with constant compression factor (called PT conversion),
- conversion to volume at base conditions or mass as a function of pressure, temperature and taking into account the compression factor (called PTZ conversion),
- conversion to energy taking into account volume at base conditions and fixed gross calorific value,
- conversion to energy taking into account volume at base conditions and measured or calculated gross calorific value.