Volume Conversion Devices
Volume conversion devices are auxiliary devices of large gas meters. They convert the volume measured by the gas meter at working conditions into a volume at standard conditions (1.01325 bar and 0 °C).
Verification of Gas Meters and Volume Conversion Devices
Gas meters and volume conversion devices are subject to mandatory verification in Austria. The first verification of a new instrument is called initial verification. The verification of an unverified instrument is a new verification. Verification during the validity period is a reverification.
The Measuring Instruments Directive (MID) has been applied in all EU Member States since October 30, 2006 regulating the first placing on the market of measuring instruments subject to mandatory verification. These measuring instruments have to undergo a conformity assessment procedure. Gas meters and volume conversion devices are included in the MID. Therefore measuring systems with a conformity certificate can be put into use without any further national type approval or initial verification.
The conformity assessment is equivalent to the initial verification.
Modules B+D, B+F, and H1 are the conformity assessment procedures applicable to gas meters and volume conversion devices.
See Measuring Instruments Directive MI-002.
New and initial verification of gas meters and volume conversion devices are regulated by national regulations and carried out by accredited verification bodies.
The reverification period for diaphragm gas meters is 12 years, for volume conversion devices 5 years, whereas turbine and rotary piston gas meters are exempted from reverification.