This European Standard specifies the requirements and tests for the construction, performance, safety and conformity of gas-volume electronic conversion devices associated to gas meters, used to measure volumes of fuel gases of the 1st and 2nd families according to EN 437. This European Standard is intended for type testing, the detailed relevant provisions of which are given in Annex A. Only three kinds of conversion are treated in this European Standard: conversion as a function of temperature only (called T conversion); conversion as a function of the pressure and of the temperature with constant compression factor (called PT conversion); conversion as a function of the pressure, the temperature and taking into account the compression factor (called PTZ conversion). This document is not relevant to temperature conversion integrated into gas meters which only indicate the converted volume. EN 12405-2 for energy conversion is in preparation. Gas-volume conversion devices consist of a calculator and a temperature transducer or a calculator, a temperature transducer and a pressure transducer locally installed. For application of this European Standard, a conversion device may be, as a choice of the manufacturer, considered as a complete instrument (Type 1) or made of separate elements (Type 2), according to the definitions given in 3.8.1 and 3.8.2. In this last case, the provisions concerning pressure transducers, temperature sensors and temperature transducers are given in Annexes B, C and D respectively. Any conversion device can provide an error curve correction for a gas meter. NOTE When rendering an account to an end user the readings from the conversion device can be used in conjunction with the readings from a gas meter conforming to EN 1359, EN 12480, or EN 12261, as appropriate, or to any other appropriate and relevant international or national standard for gas meters, without prejudice of national regulations.
EN 12405-1:2005+A2:2010 Referenced Document
EN 1776:1998 Gas Supply Systems - Natural Gas Measuring Stations - Functional Requirements (Ratified European Text)
EN 437:2003 Test gases - Test pressures - Appliance categories (Incorporates Amendment A1: 2009)
EN 55011:2009 Industrial, scientific and medical equipment - Radio-frequency disturbance characteristics - Limits and methods of measurement (Incorporates Amendment A1: 2010)*， 2024-04-20 Update
EN 60068-2-1:2007 Environmental testing - Part 2-1: Tests - Test A: Cold
EN 60068-2-2:2007 Environmental testing - Part 2-2: Tests - Test B: Dry heat
EN 60068-2-30:2005 Environmental Testing - Part 2: Tests - Test Db and Guidance: Damp Heat, Cyclic (12 + 12 Hour Cycle)*， 2024-04-20 Update
EN 60068-2-31:2008 Environmental testing - Part 2-31: Tests - Test Ec: Rough handling shocks, primarily for equipment-type specimens
EN 60068-2-78:2001 Environmental Testing Part 2-78: Tests - Test Cab: Damp Heat, Steady State (Remains Current)*， 2024-04-20 Update
EN 60079-0:2009 Explosive atmospheres - Part 0: Equipment - General requirements [Superseded: CENELEC EN 61241-0]
EN 60079-1:2007 "Explosive atmospheres - Part 1: Equipment protection by flameproof enclosures ""d"""
EN 60079-2:2007 "Explosive atmospheres - Part 2: Equipment protection by pressurized enclosure ""p"""
EN 60079-5:2007 "Explosive atmospheres - Part 5: Equipment protection by powder filling ""q"""
EN 12405-1:2005+A2:2010 history
2021EN 12405-1:2021 Gas meters - Conversion devices - Part 1: Volume conversion
2018EN 12405-1:2018 Gas meters - Conversion devices - Part 1: Volume conversion