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St. Croix Sensory remains open and committed to the success of your project needs throughout the COVID-19 pandemic.

For the safety of our clients and staff, we have outlined our “Best Practice Recommendations” for the use and care of the Nasal Ranger Field Olfactometer, Odor Sensitivity Test Kit and odor sampling equipment.


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Olfasense TO-Evolution Olfactometer

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The TO-Evolution is the latest olfactometer from Olfasense.
Convenient Design
Multiple sniffing stations with one single dillion system module. Dilution system module can be easily removed to ship for calibration service.
Modular Design
The TO-Evolution modular design allows for 2, 4, or 6 assessor stations.
LIMS Software
WINose LIMS Software stores all laboratory sample records.
LIMS Software
Store butanol testing results for all assessors.
Ergonomic Design
Sniffing ports extend for comfort of assessors.

St. Croix Sensory is proud to offer the olfasense line of olfactometers to North America.  The olfasense TO series olfactometers are used by over 325 laboratories worldwide.

The TO-Evolution is the latest generation of olfactometer from olfasense.  This innovative, modular design allows for scalability from 2 to 6 stations, while keeping the dilution system in a compact, serviceable unit.  The TO-Evolution can operate in all commonly used standards of olfactometry, including Yes/No (EN13725), Dual Forced-Choice (EN13725) and Triangular Forced-Choice (EN13725 & ASTM E679). 

Learn more at the specific product web site:

TO-Evolution’s modular design allows for the laboratory to adapt the system to 2, 4, or 6 sniffing stations.

Programmed to operate under multiple testing modes that meet EN13725 and ASTM Standards.

Dimensions:   W x H:  36 x 21″ (900 x 550 mm)

                                    2 Station:  26″ (665 mm)

                                    4 Station:  54″ (1370 mm)

                                    6 Station:  77″ (1965 mm)

Weight:                        2 Station:  63.3 lb (28.7 kg)

                                    4 Station:  95.0 lb (43.1 kg)

                                    6 Station:  130 lb (57.5 kg)

Sniff Ports:   Multi-station (2, 4, or 6 stations), single sniffing port for TFC and Yes/No.

                                                                         two ports for binary forced-choice

Testing Modes:    Triangular Forced-Choice
                             Binary Forced-Choice

Concentration Series:   Factor of 1.4 (31 dilution steps) or 2.0 (16 dilution steps)
Presentation Flow Rate:  20-LPM, can be customized

Dilution Range:   22 to 217  (Nominal 4 to 130,000 dilution ratios) [binary forced-choice 8 to 130,000]

Repeatability:  Meets EN13725:2003 requirements

Number of Assessors: 2, 4 or 6 assessors

Required Sample Size:  3.5-L for forced choice mode (>500 O.U.), 14.5L (60-500 O.U.) and 54L (<16 O.U.)

Air Supply: Separate compressed air supply (4.3-4.8 bar) providing minimum 100 LPM, more common 200LPM
                    System includes carbon filtration.

Power:  110-240VAC 50/60Hz

Control: PC with TO-evolution control software and Laboratory management program included (Windows 7 or newer).

Data Management:  WiNose LIMs program included

Q: What dilution technology is used?
The TO-Evolution uses proprietary technology, using calibrated restrictions, minimizing internal volume and providing ultra fast response in dilution changes.

Q: What air system is used?
An air compressor system is needed to provide the dilution air for the olfactometer.  Size of the compressor system will depend on the number of sniffing stations.

Q: How much sample volume is required?
In normal operation, the olfactometer needs 8-10 Liters of sample.  For a 6-station dual-forced-choice with a presentation time of 15-seconds per dilution step for each assessor, it can be necessary to use a higher sample volume for low odor concentration samples.

Top Notes from the Lab