This European Standard specifies the requirements and tests for the construction, performance, safety and conformity of conversion devices used to determine the energy of fuel gases described in the Table 1, including those of the 1st and 2nd families according to EN 437. The energy conversion device (ECD) considered in This standard consists of an energy calculator (EC) and is associated with the following devices and/or functions: a volume conversion device (VCD) or a flow computer used as gas meter conversion, either conforming to EN 12405-1:2005+A2:2010, or to prEN 12405-3, for high accuracy measurements; a calorific value determination device (CVDD). Requirements for type approval tests of the devices, not included in the above-mentioned standards are described in appropriate annexes specified in Table 6. For the purpose of this European Standard, the term "volume conversion devices" (VCDs) includes flow computers (FCs). A single calculator may undertake the volume conversion functions for different metering lines.
EN 12405-2:2012 Referenced Document
EN 437 Test gases - Test pressures - Appliance categories
EN 55011 Industrial, scientific and medical equipment - Radio-frequency disturbance characteristics - limits and methods of measurement
EN 60654-2 Operating Conditions for Industrial-Process Measurement and Control Equipment Part 2: Power
EN 61000-2-2 Electromagnetic Compatibility (EMC) Part 2-2: Environment Compatibility Levels for Low-Frequency Conducted Disturbances and Signalling in Public Low-Voltage Power Supply Systems
EN 61000-4-8 Electromagnetic compatibility (EMC) - Part 4-8: Testing and measurement techniques - Power frequency magnetic field immunity test
EN 61000-6-1 Electromagnetic compatibility (EMC) - Part 6-1: Generic standards - Immunity for residential, commercial and light-industrial environments
EN ISO 12213-3 Natural gas - Calculation of compression factor - Part 3: Calculation using physical properties (ISO 12213-3:2006)
ISO 6976 Natural gas - Calculation of calorific values, density, relative density and Wobbe indices from composition*， 2016-08-01 Update
EN 12405-2:2012 history
2012EN 12405-2:2012 Gas meters - Conversion devices - Part 2: Energy conversion