TO9 olfactometer

The TO9 olfactometer has all the functionality of the TO8 olfactometer, plus the dual-forced-choice method.

The olfactometer meets all the requirements of a dilution device for olfactometric measurements according to EN 13725. Using the TO9 olfactometer gives you a complete description of an odour sample.

The maximum dilution increases to 217, allowing you to measure samples of higher odour concentrations than is possible with the TO8 olfactometer.

TO9 olfactometer


All our olfactometer models are designed to measure odour concentration, odour intensity and hedonic tone. They are fully compliant with the following standards:

  • EN 13725
  • AS 4323.3
  • NCh 3190
  • VDI 3882
  • NVN 2820


    • All the functionality of the TO8 olfactometer
    • Plus dual-forced-choice method
    • Fastest analysis: Yes/No method approx. 5 minutes, dual-forced-choice method approx. 7 minutes
    • Maximum dilution 217

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    Technical Data

    General Details
    Olfasense GmbH, Germany
    Dimension (L x W x H)
    a) assembled
    b) transport size
    a) 650 x 650 x 470 mm
    b) 650 x 650 x 270 mm
    18 kg
    Maximum calibration interval
    12 months (according to EN 13725)
    24 months (warranty extension up to 5 years through servicecontracts possible)
    Technical Specifications
    Dilution principle
    Gas jet pumps and calibrated precsion orifices for sample dosage
    Vent for surplus diluted odour
    Outlet air via active carbon filter
    Number of panel members working simultaneously
    Maximum panel size (software setting)
    Analyses time for one sample
    5 min (yes/no)
    7 min (dual-forced-choice)
    Required air supply
    Yes-/No: 115 l/min, oil-free
    Dual-Forced-Choice: 180 l/min, oil-free
    Dilution range
    2² (1:4) - 2¹⁷ (1:131,072)
    Interval steps
    Factor 2
    Dilution accuracy
    < 5%
    Response / setting time
    < 0.1 sec
    Required sample volume
    High concentrations: 2-3 liter
    Low concentrations: 8-10 liter
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