DS EN 50267-2-2:1998 Common Test Methods For Cables Under Fire Conditions - Tests On Gases Evolved During Combustion Of Material From Cables - Part 2-2: Procedures - Determination Of Degree Of Acidity Of Gases For Materials By Measuring Ph And Conductivity Defines the test method and procedure for the determination of the degree of acidity of gases evolved during the combustion of materials taken from electric or optical cables by measuring pH and condu