BetaCAP60-3G is a 60-step diluter, capable of diluting 2 gases in a diluting gas, in any relationship between them. BetaCAP60-3G was created to satisfy the need of combining linearity tests with the possibility of performing interference tests. For this purpose, having two components (measuring and interfering) pure or contained in mixture in different cylinders, these can be diluted differently and independently. To clarify the operating conditions, it is convenient to define the three gases as diluted gas, interfering gas and diluting gas : each of the three gases, can vary virtually between 0 and 100% (60:60) of the applied concentration.