The hot air from the unit can also be used to regenerate carbon filters and silica gels in the odour/humidity filter built into the SM100, SC300, or the SS600. The SP20 provides a unique function of cycling between injecting hot air and vacuuming to speed up purging of Tedlar and other reusable bags.

Benefits of Cyclic Purging:

Cyclic Purging significantly reduces the required purging time as the vacuum of the sample bags forcibly pulls odour causing molecules from the surface of the bag. Typical sample bag purging time of 1 hour using conventional hot air can be reduced to approximately 7 minutes using cyclic purging.

Heated Air Purger Basics of Operation:

Mode 1: Continuous Hot Air Purging: Used to clean sample lines, PTFE tubes, and to regenerate carbon and silica gel filters

• Air temperature is set on the unit by the operator
• The unit provides continuous hot air at the specified temperature as monitored by a built-in thermo-couple 

Mode 2: Cyclic Purging (Sample Bag Purging): Used to quickly clean reusable sample bags

• The operator sets temperature and pressure as well as the cycle time in seconds (1 – 30s)
• The unit injects hot air for the duration of the cycle, filling the sample bag
• At the end of the injection cycle, the unit switches to vacuum and completely draws the air from the same sample bag
• The cycle is continuously repeated creating a lung-like effect

For more information on the Heated Purger, click here!

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The HVAC Warden is a stationary HVAC monitoring companion that has been developed by Scentroid.

The Scentroid HVAC Warden will keep your facility occupants safe by providing real-time air quality monitoring based on high accuracy detection of dangerous gases, including the temperature and humidity of the sample. Instead of letting your HVAC run constantly, the warden helps to reduce energy costs by sending monitored information to the building’s ventilation system control system and then optimizes air change rates. This energy-saving concept was designed for hospitals, laboratories, and university research centres with high air change rates per hour.

Based on your data, the HVAC Warden can be customized to detect over 60 pollutants as well as particulates PM1, 2.5 and PM10. The chemicals to be measured by the Warden are specified at the time of ordering. Users can even download air quality data and evaluate their facility’s performance.

For more information on the HVAC Warden, click here!

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Represents the pleasantness or unpleasantness of an odour. It is subjective to each person and therefore may evoke an emotional response depending on experiences with that odour.  It measures how acceptable an odour may be and is indicative of the potential of an odour becoming a complaint. Some form of scale is used to judge the odour. According to VDI3882, a scale of -4 to 4 is used. -4 represents extremely unpleasant odour, 0 represents neutral odour and 4 represents extremely pleasant odour.

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Pollutants released into the atmosphere as particles and volatile organic compounds (VOCs) — including the known carcinogens of benzene and toluene — from a variety of sources such as vehicle emissions, petrochemical products, and tobacco smoke. Of particular concern are persistent organic pollutants (POPs) that are not easily broken down, and can, therefore, travel great distances, as well as accumulate in living organisms.

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The inability or decreased ability to perceive an odour as continued exposure to that odour increases over time. An odour may initially be strongly detectable but may diminish completely in a few minutes. Hydrogen sulphide is an example of a chemical that emits a rotten egg smell, but depending on concentration and exposure time, the rotten egg smell will no longer be perceived even though it is still present. Olfactory fatigue is not desired during olfactometry analysis or ambient odour monitoring.

During ambient odour monitoring, it is desired to provide rest periods in a neutral environment compared to the one odour is present if possible.  An example may include a vehicle, which may act as a separate environment to the one ambient odour monitoring is taking place. Perfumeries use coffee bean odour to ‘reset’ the olfactory sense.  Also, having neutral odourless air to be smelled for a few minutes may help reset the olfactory sense.

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