Flow meters: Accelerated durability testing (NT VVS 121)

Abstract

  The aim of this method is to provide an accelerated durability test for flow meters. The method applies to mechanical and non-mechanical cold water meters, hot water meters and district heating meters with flow rates less than 10 m3/h. The method is designed to be used as a supplement to existing pattern approval tests and as such is primarily intended for use by laboratories carrying out pattern approval testing.