Sch 1 para 4 Volume conversion devices
(1) In this paragraph “ conversion device ” means a device fitted to a gas meter that automatically converts the quantity measured at metering conditions into a quantity at the specified conditions to which the quantity of fluid is converted. (2) The essential requirements relating to conversion devices intended for residential, commercial and light industrial use are— (a) the requirements of Annex I to the Directive; (b) the specific requirements set out in Part II of Annex IV. (3) The conformity assessment procedures specified in the modules in Annex II to the Directive applicable to conversion devices are— (a) B and F; (b) B and D; or (c) H1.