Diluting with Equal Capillaries Technique : why the best results ?
Equal pressures applied to equal capillaries induce equal flows. When equal flows are some from a gas to be diluted and some (the remaining) from a diluting gas, dilution is given by the ratio of integer numbers : the number of capillaries crossed by the gas to be diluted divided by the total capillaries number. The key for having very low uncertainty in dilution with a 'Equal capillaries' gas divider is equality of capillaries and perfect balancing of applied pressures. This is true when viscosities of the two mixed gases are also very near each other. This condition is frequent in CEMS and Air quality monitoring, but when not complied, it's possible to compensate viscosities effects.