Part 3 of this European Standard specifies the requirements and tests for the construction, performance, safety and conformity of flow computers (FCs) used to meet the metrological and technical requirements of a high accuracy volume conversion device. They are used to determine volume of fuel gases, including those of the first and second families according to EN 437. For the purpose of this European Standard, only flow computers that are intended to operate with ultrasonic meters according to ISO 17089-1 or gas turbine meters conforming to EN 12261 are considered. For the purpose of this European Standard only classification classes E2 and M1 are considered for the flow computer calculator. FCs are equipped with external separate transducers for pressure and temperature which may be approved separately. The provisions concerning pressure and temperature transducers are given in Annex B and C. Requirements and tests are given for energy calculator in EN 12405-2.
EN 12405-2:2012 Gas meters - Conversion devices - Part 2: Energy conversion
EN 1776:1998 Gas Supply Systems - Natural Gas Measuring Stations - Functional Requirements (Ratified European Text)
EN 22768-1:1993 General tolerances; part 1: tolerances for linear and angular dimensions without individual tolerance indications (ISO 2768-1:1989)
EN 24006:1993 Measurement of fluid flow in closed conduits; vocabulary and symbols (ISO 4006:1991)
EN 50160:2010 Voltage characteristics of electricity supplied by public electricity networks (Incorporating corrigendum December 2010)
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 60 Glass reinforced plastics. Determination of the loss on ignition
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 12405-3:2015 history
2015EN 12405-3:2015 Gas meters - Conversion devices - Part 3: Flow computer