The SC300 Portable Olfactometer is an olfactometry device developed by Scentroid.

Scentroid’s SC300 is the world’s most advanced mobile olfactometer. It allows for a full odour lab to be deployed anywhere in a matter of minutes. There is no need for dedicated lab space – Simply plug in the SC300 and start analyzing odours to all international standards. The SC300 can perform any odour test mode you require including a true 3 port triangular forced-choice as well as binary, hedonic tone, and direct presentation.

Deployment only requires connecting the power cord to a standard 120/240 VAC outlet and connecting the pneumatic hose between the air supply subsystem and the control sub-system. The air sub-system provides clean air regardless of ambient air through its incorporated oil-free pump, HEPA filter, carbon filter, no-maintenance membrane air dryer, and regulator. The test administrator can then view live results, analyze data, and control the test using the dedicated admin. station with the included Siemens 8” touch screen.

Scentroid Mobile Air Supplier

The Scentroid Mobile Air Supply is designed to provide compressed air supply for a variety of Scentroid products out in the field. This is ideal due to the fact that it produces no oil in the airflow, and therefore can be used as an independent air supply when the oil in the airflow is often an issue. The compressed air from the tank is monitored from the pressure meter, and if it rises more to 8 bar (approximately 116 psi) the tank will automatically cut-off the pressure control switch. When the pressure inside the tank lowers to 6 bar (approximately 87 psi) then the power is turned back on. The compressed air is passed through a cooling system to prevent overheating after prolonged use. Fans are used on either side of the container to ensure air is passing through, allowing the air supply to work while the lid is closed. A final gauge is used to regulate the airflow being used and is ideally set at 80 psi. The final step is to simply attach the product to the outlet and turn on the main switch.

SC300 Applications

• Conduct on-site odour measurements
• Determine odour concentration in OU / m3, as per the recognized EN13725 standard
• Conduct a hedonic tone (pleasant to unpleasant) assessments of odour emissions
• Conduct panellist training and N. Butanol screening
• Determine odour concentration in accordance with recognized Chinese and Japanese standards (GB/T14675-93)
• Employ binary, triangular, yes/no, and direct presentation methods
• conduct odour assessments from petrochemical, oil refineries, and agricultural sources due to unparalleled contamination control technology

For more information on the SC300 Portable Olfactometer, please click here.

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The SM100 is an intelligent in-field olfactometer that has been developed by Scentroid.

The SM100i draws a sample of ambient air via Venturi pump and dilutes it using fresh, odourless air from a compressed air tank. The SM100i takes out all the guesswork from personal olfactometry. This is done through automatically screening panellists and conducting a YES/NO test mode to determine accurate odour concentration and hedonic tones. The SM100i requires no sample bags, no filters to change, no pumps or other moving parts to maintain. An instrument you can rely on!

Scentroid’s SM100i conducts a full odour analysis in accordance with the international EN13725 standard. The SM100i can analyze from a sample bag or be deployed in the field for direct olfactometry and ambient odour measurements. In addition to odour concentration (in OU), the SM100i (with the use of the wearable OdoTracker) can also automatically record Ammonia (NH3) and Hydrogen Sulphide (H2S) in real-time.

SM100i Applications

• Perform daily odour assessments and identify their sources
• Determine odour mitigation effectiveness
• Evaluate the odour emission impact on nearby residents
• Monitor emission compliance and conduct N-Butanol screening
  

Odour Measurements

Conduct odour measurements from:

• Ambient air without any additional sampling equipment
• Directly from smokestacks or filter inlets
• Flux chambers
• Air samples in PTFE/Tedlar Bags

For more information on the SM100i, please click here.

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VDI 3882 refers to the German standards and methods of olfactometry, which is split into 2 major parts detailed below:

VDI3882 Part 1

Part 1 describes an olfactometric method of investigation. It can be used to assess inhaled samples having odorant concentrations above the odour threshold (suprathreshold concentrations). This is in relation to the sensation intensity they induce in human beings. For a given odourant concentration, this sensation intensity is substantially dependent on the substance and/or mixture. This means that height can be used in variation intensity calculations as a characteristic of that sample. The investigation of the odour intensity of individual concentration levels using an olfactometer makes it possible to assess it under field conditions.

Above all, with the field of emission reduction, the determination of the intensity of an untreated waste provides guide values. These can be used for the reduction in odorant concentration needed to maintain certain odour intensity at the source. In this connection, the assessment will be all the more reliable, the less the untreated gas composition is altered by the reduction technique used.

The relationship between the odour intensity and the odorant concentration makes it possible to use intensity determinations carried out on clean gas samples and dispersion calculations for odorants [6] to make forecasts of the theoretically remaining odour intensi¬ ty in the field (ambient air). Perceptible interfering actions due to synergistic effects with other odorant emissions are not allowed for in this connection since they cannot be included in the calculations.

However, the variation in intensity cannot be used to describe the nuisance potential of an odourant sample.

Odour Guideline Standards

The Standards set by this Guideline apply to odour intensity determinations carried out on the following samples :

a) emission samples obtained from a source of the odour
b) individual substances or specified mixtures of substances in neutral air,
c) Above all, emission samples provided their odorant concentration is high enough for an olfactometer to be used

VDI3882 Part 2

Part 2 of Guideline VDI 3882 describes an olfactometric method of evaluating the hedonic tone of odorous samples. These samples are above-threshold odourant concentrations according to the sensation scale “pleasant – unpleasant”. The hedonic tone of an odour is contingent on the nature or mixture of the odorous substance or substances. These are on the odourant concentration – the perceived intensity of the odour – and on the background experience of the individual. This means that, by evaluating several above-threshold stages of concentration of a specific odorous sample. However, it is possible to plot the hedonic odour tone as a characteristic curve of the sample under investigation.

The hedonic tone of an odour, most importantly, must not be confused with its quality (fragrant, pungent, stale, or smell like…)

In conclusion, with regards to the methods recommended in VDI 3881 for determining odourant concentration (odour threshold) and odour intensity, the additional determination of the hedonic odour tone of an emission sample frequently permits an assessment of its nuisance effect. This occurs under ambient air conditions, though a conclusive assessment of the actual degree of nuisance is not possible with olfactometric methods alone. In cases where it is necessary to ascertain the nuisance effect, additional sociological methods (e.g. neighbourhood surveys) can be helpful

Hedonic Tone Guidelines

This guideline is valid for the determination of the hedonic odour tone of the following types of sample :

a) Above all, emission samples come from a source of the smell
b) Single substances or defined mixtures in a neutral gas,
c) Ambient air samples, with regards to their odorant concentration, is high enough for detection by the olfactometer

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The process of analyzing the responses of odour(s) using human subjects (assessors). The responses can be used to determine the odour concentration of odour intensities or the hedonic tone of the odour. Assessors will use a series of devices known as olfactometers.

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European Dynamic olfactometry is described in detail by the standard EN 13725. This standard was last released in 2003 and is currently under review for revision. As of 2020, an updated version is still waiting to be finalized in the UK. Key elements of this standard are the focus on quality criteria for precision and repeatability. The EN13725 tries to link these values to standard values of n-butanol in nitrogen. It is assumed in this standard that whenever a laboratory complies with the overall sensory quality criteria for n-butanol, the quality level is transferable to other, environmental, odours.

The Standard describes the different test modes such as Triangular Forced Choice, Binary Forced Choice, and Yes/No method for determining the true odour concentration of a sample bag.

Testing Requirements

Many aspects of testing are defined including:

• Number of panellists (min. 4)
• Acceptance criteria of each panellist
• Airflow (20 litres per minute) design of the olfactometer, presentation airspeed, minimum dilution, maximum dilution, and maximum step size
• Calculation of individual detection thresholds and overall detection threshold
• Design of the testing room including temperature and humidity
• materials used in the olfactometer

One of the main objectives of the EN13725 standard is inter-laboratory testing and panellist screening.

While the EN13725 does cover sampling, it is generally accepted that sampling techniques require much greater attention in the next revision of the standard. The standard does provide guidance on the type of sample bags (nalophan, Tedlar, PTFE, etc) and on the dilution devices required (stack diluting sampler, flux chamber, static hood, etc).

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