an olfactometer has a sniffing port , a sample supply for generating a sample flow constituted by a carrier gas and sample head space from a saturation chamber and for supplying the sample flow to the sniffing port , a carrier gas supply , and mixer for predetermined dilution of the sample flow . the carrier gas supply includes mass flow controllers with variable flow rates disposed before the saturation chamber for providing variable carrier gas flow to the saturation chamber . a multiplicity of capillaries of different diameter connect the mixing means with the sniffing port via individual injectors . a computer may be interphased with the olfactometer to regulate the amount of sample and / or carrier gas in the sample flow .