30 Air Monitoring
Gas analysis specialists expand range of service contracts
Ultrafi ne particle monitoring for air quality measurements
Air quality affects us all. While the fi eld of air quality encompasses many aspects, one topic that is been gaining attention in recent years is the measurement of ultrafi ne particles.
Ultrafi nes are particles that are too small to contribute appreciably to mass-based measurements, but are present in ambient air. They are quantifi ed using the concept of ‘number concentration’, or number of particles per cubic centimetre of air. For more on number-based measurements, there are a series of white papers available from TSI.
Signal Group has announced the launch of a new fl exible range of service contracts, which enable customers to determine the level of service required. “No two companies are the same,” explains Signal Group Service Manager Roy Kinslow, “so it makes sense for us to offer a tiered-package approach to service contracts.
“Our gas analysers are designed and built for accurate and reliable measurements, but in order to optimise performance, it is necessary to establish a planned maintenance and calibration routine. These new fl exible service contracts therefore offer customers the ability to build resilience into their monitoring work; developing plans for unforeseen events and avoiding downtime.”
Each of the different service levels include full technical support via phone and email, but customers are able to choose whether their plan should also include features such as scheduled site visits and emergency call-outs. Each service plan also provides extra discount on spares and consumables.
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Improved performance for air sampling worth raving about
Restek’s RAVE+ diaphragm valves offer enhanced features that bring premium performance to air sampling operations. Unlike other valves that contain soft polymeric materials, RAVE+ valves are 100% stainless-steel construction, which eliminates sample contamination from off-gassing, prevents target compounds from being lost due to adsorption, and ensures a longer service life. The valve port threads are roller hardened to increase durability, resist damage, and prevent leaks. Rugged, work-hardened, proprietary, all-metal valve seats provide protection against particles that cause leaks. In addition, a
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Measuring the particle number concentration of particles in ambient air is mainly done using a single particle counting technique and focuses on particles in the size range of ~1 nm to ~1 µm. This technique utilizes a condensation process to make those tiny, invisible particles visible to an optical counter. These Condensation Particle Counters (CPCs) work over a wide range of concentrations and can therefore be used both in heavy polluted areas and at background stations. The European standard CEN/TS 16976 describes the use of CPCs to determine atmospheric aerosol number concentrations, while CPC calibration is described in ISO 27891:2015. CPCs are fully automated systems with very low user interaction during long-term operation. TSI has continually built expertise since releasing the fi rst commercially available CPC in 1979.
Using a CPC as the basis, adding sizing capability adds another level of insight. Since airborne particles are present over a very wide size range, various technologies have been developed to measure particle diameter. Ultrafi ne particles can be measured with high time and size resolution, typically covering a particle size range between 1 nm and 1 µm. These ultrafi ne particle spectrometers are based on electrical mobility measurement (as described in ISO15900:2009) and utilize CPCs to count the number of particles in each size channel. Determining the ultrafi ne particle size distribution is described in the new European standard draft CEN/TS 17434 as released in 2019. In this standard, the method ‘Mobility Particle Size Spectrometer (MPSS)’ is used to cover a size range from 10 nm to 800 nm. TSI’s Scanning Mobility Particle Sizer (SMPS) fi ts this need and has been making ambient air measurements worldwide for years.
TSI is a global leader in the fi eld of condensation particle counters and Mobility Particle Size Spectrometers (SMPS, MPSS). The instruments are available in various versions, to cover applications such as new particle formations (down to 1 nm), engine emission measurements, and also ambient monitoring. In the context of developing regulations and evolving science, TSI will continue to serve the ambient monitoring community for years to come.
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VOC-free, thread-locking adhesive prevents the valve knob from loosening and ensures it stays securely in place. RAVE+ valves also now feature a built-in hard stop that prevents users from turning the knob too far and locking the valve open. As a fi nal measure to ensure reliable performance, every RAVE+ valve is helium leak tested to 1x10-6 mL/sec prior to shipping. With these enhanced features, RAVE+ diaphragm valves build on the high- quality standard of original RAVE valves and provide superior performance for air sampling.
Now standard on Restek’s full line of SilcoCan, TO-Can, and miniature air sampling canisters, these newly redesigned, state-of-the art valves are also ideal for upgrading existing canisters. Rugged, all-metal RAVE+ valves can be ordered with Siltek treatment for added inertness and with either two or three ports to accommodate an optional gauge. Diaphragm rebuild kits and RAVE+ guards are also available to further extend the life of these long-lasting air valves.
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IET JANUARY / FEBRUARY 2022
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