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Specifies the requirements and tests for the construction, performance and safety of gas-volume electronic conversion devices associated to gas meters, used to measure volumes of fuel gases of the 1st and 2nd families. Three kinds of conversion are treated in this standard: - conversion as a function of temperature only (called T conversion);- conversion as a function of the pressure and of the temperature with constant compressibility factor (called P T conversion);- conversion as a function of the pressure, the temperature and taking into account the compressibility factor (called P T Z conversion). These conversion devices consist of a calculator and a temperature transducer or a calculator, a temperature transducer and a pressure transducer. The liaison between the calculator and the transducers if they exist are elements of the converion device. This standard concerns conversion devices tested as one instrument, calculator and transducers connected. Any conversion device may include provision for the inclusion of the meter error correction. The conversion device shall be used with a gas meter conforming to standards.