odour sample, odour assessment, odour dilution, industrial odour, agricultural odour, manufacture odour

DS5 Stack Diluting Sampler

Stack sampler is an easy to use device that provides accurate pre-dilution of high temperature gas emissions with nitrogen or zero-air to minimize condensation inside the sample bag. Dilution is achieved inside the heated probe and can be controlled from 1:3 to 1:305 in 14 steps.

  • Flue gas heated probe
  • completely stainless steel wetted surfaces
  • includes nitrogen micro-tank with filter and regulator
  • one push sampling operation
  • grab and time sampling from 1-17 LPM
  • lightweight and easy to carry up stacks
  • High temperature compatibility
Basics of Operation
  1. Attach the sample bag
  2. Open the valve on the Nitrogen micro-tank
  3. Select the desired dilution from 1:3 to 1:305 bu installing the corresponding dilution disk
  4. Insert the probe into stack and allow 3 minute for it to reach the same temperature as the stack gases
  5. Press the trigger and wait for the sample bag to fill up.

If hot gasses emitted from a stack are directly placed in a Tedlar or Nalophan bag they begin to develop condensation. These small droplets of water absorb many of the critical components that contribute to the overall odour of the sample. The stack diluting sampler eliminates this problem by mixing the stack air with dry clean Nitrogen so that the moisture can’t condense inside the bag. The mixing happens inside the probe and since the probe becomes at the same temperature as the stack air, there is no chance of the sample developing condensation before being mixed with Nitrogen.

odour map application, odour samping, industrial odour, agricultural odour, manufacture odour, odour assessment, odour control

Odour Map Application

Scentroid Odour Map is a valuable addition to the SM100 in-field olfactometer. This application automates the process of odour sampling, measurement, and evaluation. Save time and eliminate chances of error by instantaneously record and organize GPS position, time, wind speed, distance to source emission and more, for each sample.

  • Automated calculation of distance and bearing to all sources
  • Logging of wind speed and wind direction
  • Automated conversion from SM100 reading to OU/m3
  • Multi-user support
  • Multi-instrument support
  • Cloud backup and restore functions
  • Storage of field notes and descriptions
  • Live map view of all sources and sampling points
  • Compatible with any Android operating system
Basics of Operation
  • Enter position of all sources or pre-planned sampling points
  • Application will guide you to the next location to be sampled
  • Take a measurement and enter the reading
  • GPS position, time and wind conditions will be collected automatically
  • Enter field notes and other information required
  • Sent data and generate report directly from the app
  • Sample time and date
  • Exact GPS position
  • Wind direction
  • Wind speed
  • Bearing/Distance to multiple source emissions
  • Odour Intensity in OU based on SM100 reading
  • Odour description
  • Descriptive notes entered by the user
Automated Reporting & Organized Sampling

Scentroid Odour Map collects and stores all data for each site compiling an instantaneous report. Emission sources and sample locations can be instantaneously mapped to a Google satellite view.

The Odour Map software directs the user on the distance and bearing to all recorded emission sources. Using recorded wind speed and direction the technician can select ideal sampling locations for effective odour measurement.

odour sample, odour assessment, odour dilution, industrial odour, agricultural odour, manufacture odour

SH25/SH50 Static Hood Sampler

The Scentroid Static Hood sampler provides an easy to use and contaminate-free solution for taking air samples from bio-filter beds and other surfaces that have a positive air flow. The all stainless steel construction ensures easy decontamination. The stack disassembles for ease of transportation.

  • All Stainless Steel Construction
  • PTFE coated interior
  • Minimum back-pressure
  • Removable stack
  • EPA and portable models
Basics of Operation

EPA model sh50

The scentroid static hood sampler is designed to the EPA guidelines with an enclosed area of 0.5 square meters. The solid stainless steel construction makes for rapid and easy cleaning. The surface can be cleaned to ensure no cross contamination affects the samples. To acquire a sample simply:

1. Place the static hood on the surface and firmly press down.
2. Wait for the sample to fill the hood three times.
3. Acquire the sample at half the rate of emission.


Portable Model

The 0.25 square meter model provides a smaller and more portable version to be used with the SM100 for assessing the efficiency and health of a bio-filter. The SM100 can be connected directly to the sample port of the Scentroid static hood for direct measurement. ODMAP software can be used to plot and assess the health and efficiency of the bio-filter.


How many points do you measure on a typical bio-filter bed?

The number of points checked by static hood and olfactometery is directly proportional to the size of the bio-filter bed. For example a distance of 1.5-2 meters between grid points can be used to get an accurate reading of the efficiency of the bio-filter.

Can I use the static hood for sampling from an aerated lagoon?

While a lagoon is an active source it is best to sample the lagoon with a flux chamber. The SF450 has two special relief vent ports that should be opened to ensure minimal pressure built up.  Sample can then be pulled using a vacuum chamber.

How do I draw a sample from the static hood?

You can perform direct measurement with SM100 or other field instruments, or draw air using a vacuum chamber into a PTFE bag for laboratory analysis. Sampling rate should be kept about half as much as the air flow in the stack of the static hood.

How do I decontaminate the static hood after field sampling?

The SH50 and SH25 are made of 316L stainless with PTFE coating and therefore resist contamination very well. Usually clean water is all you need, but most unscented cleaning solutions can be used.

wind tunnel, odour map application, odour samping, industrial odour, agricultural odour, manufacture odour, odour assessment, odour control


Scentroid SW60 is the most accurate and user friendly area source sampler in the world.

The Scentroid SW60 is the next generation Wind Tunnel Sampler (AKA Ventilated Sampling Hood), used for sampling on solid or liquid surfaces with passive odour emissions in accordance with the EN13725 and VDI3880. The SW60 Wind Tunnel Sampler offers a number of unique features that make it the most accurate and user friendly area source sampler in the world.

  • Olfactory Sensitivity testing
  • PTSD study and treatment
  • Multi-sensory psychological study
  • Diagnostic and treatment of olfactory disorders
  • Product testing and market research
Basics of Operation
  • Connect the Air supply unit to the wind tunnel
  • Connect the wind tunnel to the tablet for air speed measurements
  • Connect the vacuum chamber to the sample port
  • Adjust air speed to desired value
  • Acquire sample using the vacuum chamber

Continuous Air Speed Monitoring

Scentroid SW60 Wind Tunnel Sampler has a built-in anemometer that remotely monitors the exact wind speed inside the tunnel. The data is logged and shown on any mobile tablet or phone. This not only significantly increases the accuracy of odour sampling, but also provides a means of setting the air speed to the exact desired value.

Technical Specification
Model SW60
Sources for Sampling Liquid or solid passive (non-ventilated) sources
Electronic Interface direct 3.5 mm jack
Wind speed range 0.15 m/s to 1 m/s
Battery capacity 1.5 hours
Charging options 12V DC car outlet, 100-240 V AC power
Power supply 12V-8Ah deep cycle rechargeable battery. Can also be operated directly from 12V auto power outlet
Air supply Carbon filter, variable speed blower and flexible aluminum duct enclosed in a waterproof carrying case
Standards VDI 3880, EN13725, AS4323
Sample port 1/4” / 12 mm stainless steel compression fitting
Removable Floaters PTFE coated aluminum
Wind Tunnel Material PTFE coated Aluminum Composite
Dimension 167x23x33 cm without floaters installed / 167x23x74 cm with floaters installed
Weight 10 kg


The Scentroid Flux chamber (AKA Emission Isolation Flux Hood) is used to determine levels of emissions from solid or liquid surfaces. The SF450 has a 100% solid stainless steel construction to ensure zero cross-contamination. Flotation is achieved using 4 stainless steel floats eliminating the need for rubber tubes or foam making the unit easy to clean and maintain.

  • Emission Measurement from Liquid surfaces such as settling tanks and off-spec ponds
  • Emission Measurement from Solid surfaces such as compost piles and sludge
  • Emission Measurement from liquid active sources such as aerated lagoons
  • Ideal for sampling of corrosive sources e.g. with high benzene or H2S content
  • Ideal for field operations that require quick decontamination
Basics of Operation
  • Connect the sweep air line to Nitrogen or zero air cylinder
  • Move the Flux Chamber to sampling location
  • Allow time for 2 air exchanges inside the chamber
  • Pull sample with vacuum chamber
  • For aerate liquid sources sweep air may not be required
  • 450 mm (17″) diameter with enclosed surface area of 0.155 sq meters (240 sq inches).
  • All Stainless steel construction including floaters for optimal decontamination
  • Standard fittings designed for 1/4″ or 12 mm OD PTFE tubing for sweep and sample air (custom size fitting available)
  • Additional fittings for pressure/temperature sensors
  • Dedicated pressure relief port

Can I use the SF450 Flux Chamber for petrochemical industry ?

Absolutely. The SF450 is ideally suited for the petrochemical industry where many corrosive chemicals need to be sampled. Unlike other Flux Chambers on the market that use Plexiglas dome and foam or rubber floaters, the SF450 is made of 100% stainless steel and therefore can be used in any environment.

How do I decontaminate the SF450 Flux Chamber

The SF450 is made entirely of 316L stainless steel and therefore can be easily cleaned with water in most cases. For sticky substances most solvent or unscented soaps can be used.

How do I use the SF40 Flux Chamber for sampling aerated tanks?

Most aerated tanks provide enough positive air flow to be classified as active sources. These sources can be sampled via SF450 Flux Chamber by removing the sweep air line and opening the relief port. This allows the excess gas to escape making the Flux Chamber act as a static hood on liquid surfaces.

Should I use nitrogen or zero-air for sweep air?

Nitrogen provides the added advantage of minimizing oxidization of the sample in transport, but ultimately what is available at site will dictate this choice. If Nitrogen is not available zero-air or even odourless air will work well for olfactometry if delay between sampling and analysis is minimal.

VC10 Vacuum Chamber, odour map application, odour samping, industrial odour, agricultural odour, manufacture odour, odour assessment, odour control

VC10 Vacuum Chamber

Air Sampling Chamber

The Scentroid Vacuum Chambers are easy to use, portable, and cost-effective air sample collection devices. Vacuum chambers are used to pull samples directly without dilution from stack, ambient air, or other sampling devices such as flux chamber or wind tunnel. The Scentroid vacuum chambers, air sampling box, come in multiple sizes to fit bags of up to 10L, 25L, and even 50L. Use the Scentroid Vacuum Chambers for soil gas sampling, groundwater testing, stack sampling, hazmat testing, and U.S. EPA Methods 18 and 0040 and ventilation studies. Scentroid Vacuum Chambers, bag sampling box, Designed for Scentroid PTFE sample bags.

  • Acquire sample from ambient air
  • Acquire sample from flux chamber
  • Acquire sample from static hood
  • Acquire sample from wind tunnel
  • Acquire sample from other source that will not create condensation in the sample bag
Basics of Operation
  • Open the Vacuum chamber
  • Connect the Sample bag to the PTFE tube inside the vacuum chamber
  • Close the vacuum chamber
  • Connect the external sample line to the sample collection device (i.e probe or Flux chamber) for source sampling or leave off if sampling ambient air.
  • Switch to Sample function to draw in the sample air
  • Stop when sample is half full and switch to Purge routine to exhaust all the lines and the sample bag with source air.
  • Switch to Sample function again and fill the bag with sample air.
  • Turn unit off and open the case
  • Close sample bag valve and remove it from the vacuum chamber.

Scentroid Vacuum Chamber (bag sampling chamber) uses a built in miniature pump to create a vacuum of more than 18” HG inside the sample box. The 12V rechargeable battery is capable of sustaining more than 75 samples with a single charge and can be charged using 110/220V outlet or a 12V car outlet.

Ease of use

Purging Function

Bag Sampling Chamber Purging

The purge function creates a positive pressure inside the sampling chamber forcing all the air inside the sample bag to exhaust through the sample line. This function makes purging, priming, and conditioning a one-step simple process.

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