COVID-19 Response

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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AC'SCENT Olfactometer

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    Meets the Standards
    The AC'SCENT Olfactometer tests odorous air samples following EN13725 and ASTM E679.
    Flexible Testing
    The single station design allows for flexibility in number of assessors utilized for testing sessions.
    Robust Design
    The AC'SCENT is constructed of tested and proven components.
    Rotary Selector Dial
    The first of its kind rotary selector dial allows the assessor to control the sniffing port observations. The olfactometer randomly places the dilute odor in one of three positions for each dilution level.
    Detection & Recognition Thresholds
    For each dilution level, the assessor selects one of the three presentations by guessing, detecting one port as different, or recognizing an odor character in one port.
    SWIFT Nasal Mask
    The custom designed SWIFT Nasal Mask is Teflon coated carbon-fiber epoxy. The mask slots allow presentation air to flood the nose while excess air is released away from the assessor.
    Setting the Standards
    The AC'SCENT Olfactometer has the features that all other olfactometers have since tried to match. Our innovations set the bar for all others.

    The AC’SCENT Olfactometer is a laboratory olfactometer used to measure odor thresholds according to international standards.  Current installations include universities, research institutions, engineering firms, and sanitation districts worldwide.

    • The AC’SCENT Laboratory Olfactometer is the most common olfactometer utilized in North America today.
    • The AC’SCENT meets all requirements of EN13725, ASTM E679, AS/NZ 4323.3, and China odor testing methodologies.  This was the first olfactometer in the world to incorporate the requirements for all of these standards.
    • The single station design allows for easy operation with any number of assessors.  Assessors rest their nose while others take their turn completing their dilution series testing round.
    • The innovative self-contained design has the zero-air dilution system built right into the cabinet.  Just plug it in and it is ready to go.
    • An olfactometer developed and supported by the most experienced odor laboratory in North America.

    Dimensions: 24 x 24 x 54″ (61 x 61 x 138 cm)

    Weight: 350-lbs (160 kg)

    Sniff Ports:   Single station, single sniffing port

    Testing Modes:    Triangular Forced-Choice
                                 Binary Forced-Choice
                                Direct Presentation
                                China odor testing methodology

    Concentration Series:   binary (2-fold) dilution series
                                          Ascending series for all modes, except China testing method

    Presentation Flow Rate:  20-LPM, can be customized

    Dilution Range:   23 to 216  (Nominal 10 to 100,0000 dilution ratios)

    Repeatability:  Meets EN13725:2003 requirements

    Number of Assessors: Single Stations allows for as many assessors as you choose

    Sniff Time:  Adjustable from 1-60 seconds  (3-seconds common operation)

    Required Sample Size:  5-L consumed by 10 observations (5 assessors x 2 rounds) at 20-LPM with 3-sec sniff time.

    Air Supply: Self contained zero-air system in base of cabinet.
                        Includes compressor, air drier, and carbon filtration.

    Power:  115VAC/60Hz  or  230VAC/50Hz

    Control: PLC driven for automated increment through the dilution series.
                  On-board keypad control for settings. 

    Data Management:  Optional attached laptop or desktop to collect results via DataSense Olfactometry Software Application

    Q: Why is the AC’SCENT only a single station?
    The AC’SCENT Olfactometer was designed as a self contained single station olfactometer.  This allows the olfactometer to: 1) occupy a small laboratory space, 2) easily accommodate any number of assessors, and 3) be moved within a laboratory without need for long connectors to an air system.

    Q: How can the AC’SCENT operate in Triangular Forced-Choice with only one sniff port (mask)?
    The AC’SCENT has an innovative control rotary dial, which the assessor turns to three “port” positions.  When the assessor presses the button, the on-demand system either presents the assessor with the scheduled diluted odor or one of two blanks.  The assessor requests a sniff from each of the three positions.  The dilution air system is purging at many times per second and there is no carry-over between the dilute odor and the blank positions.

    Q: How long does it take to process one odor sample ?
    An experienced panel of 5 assessors will complete evaluation of two rounds of testing one sample in 15 to 20 minutes.  Therefore, 3-4 samples are processed per hour of testing.


    Q: Does the AC’SCENT require a computer to operate it?
    The AC’SCENT is a self contained olfactometer with the PLC computer system on-board and controlling operations of the olfactometer through the operator keypad.  A laptop or desktop computer is only needed to operate the DataSense Olfactometry Software application.  This software receives results from the olfactometer via a serial cable and then automatically computes the sample results.  DataSense keeps a database record of all odor samples tested as well as assessor testing and training histories.


    The New European Olfactometry Standard: Implementation, Experience, and Perspectives
    McGinley, M.A. and McGinley, C.M.
    A&WMA 94th Annual Conference
    Orlando, FL: 25-28 June 2001

    Top Notes from the Lab