Podrobnosti návrhu

This document 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.
It is also applicable for treated non-conventional combustible gases complying with EN 437 and for which a detailed technical evaluation of the functional requirements (such as injected biomethane) is performed ensuring there are no other constituents or properties of the gases that can affect the metrological and physical integrity of the measuring systems.
This document mentions technical topics to consider when hydrogen and natural gas / hydrogen blends flow through the measuring systems.
This document can also be used as a guideline for measuring systems for other gases e.g. gaseous CO2 for CCUS.
This document is not applicable for raw or sour gases.
This document is not applicable for gas measurement in CNG filling stations.
The energy conversion device (ECD) considered in this document 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 12405-1:2021, or to EN 12405-3:2015, 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 document, the term “volume conversion devices” (VCDs) includes flow computers (FCs).
A single calculator may undertake the volume conversion functions for different metering lines.