Air Monitoring 43


Protect your environmental monitoring instrumentation from harsh industrial conditions, climate


and vandals


Schramm GmbH provides a comprehensive range of outdoor cabinets to protect and house precision instrumentation systems so they can operate, trouble-free, in any conditions. There are options of glass-fi bre reinforced polyester, stainless steel, or aluminium. A wide variety of confi gurations are available to house the many different possible analytical devices on the market. The cabinets ensure that the assets are protected from the elements, vandals and the wide range of harsh environments that are ubiquitous to industrial plants and locations where there will be conditions that would jeopardise the successful operation of precision instrumentation.


The glass-fi bre reinforced polyester (GRP) range provides operators with a cost- effective solution to protect instrumentation from adverse climactic conditions, with Ex versions available. These units are easy to assemble and robust enough to offer years of trouble-free protection, unhindered by the effects of high rates of alkali or acid exposure. These systems are fl exible and modular so can match the needs of any confi guration.


The stainless steel cabinets are customisable to meet any possible confi guration, and a choice of insulation requirements. Customers choose the lay-out, partition walls, roof, fl oor, and colours on their enclosures. SCHRAMM’s ALU Series is made from aluminium; they are vandal-proof and simple to assemble. The walls of ALU cabinets have been designed as hollow chamber panels. Ambient air fl ows through the wall elements and therefore optimally dissipates the waste heat generated in the interior.


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diaphragm gas pump


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The new NMP 820 from KNF has been designed for applications where low noise and vibration are a top priority; the NMP 820 is a micro diaphragm pump that is exceptionally quiet for its high performance. With an impressive performance-to-size ratio, the new NMP 820 delivers up to 2.1 litres per minute of free fl ow, operates at pressures up to 1.3 bar relative, and generates a vacuum down to 300 mbar absolute. Adding a second pump head increases free fl ow up to 3.6 l/min and allows for an ultimate vacuum down to 100 mbar abs. The versatile and quiet NMP 820.1.2’s optimised design provides exceptionally low noise and vibration, making it extremely versatile and ideal for a wide range of applications where pumps with those qualities are critical. These include emissions monitoring, fuel cell and inkjet systems. For fl exible and easy installation, a standard mounting plate is included. A four- wired brushless motor option is available for PWM pump control.


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More information online: ilmt.co/PL/Wexv 61094pr@reply-direct.com


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WWW.ENVIROTECH-ONLINE.COM


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61123pr@reply-direct.com


New, compact, low noise, high performance,


Air quality network in Minneapolis informs targeted TVOC exposure mitigation


AQMesh is being used in Minneapolis in a city-wide project about quality control of large sensor networks measuring total volatile organic compounds (TVOC).


This cutting-edge small sensor air quality project takes hyperlocal monitoring to the next level by validating data – in this case the focus is TVOC – and identifying where pollution is coming from. In this case it will be possible to match the type of pollution seen with potential local sources. Whilst small sensor air quality devices generally give measurements at specifi c locations (to varying degrees of accuracy), the real value comes from confi rming the accuracy of those readings and harnessing the power of a sensor network, particularly when combined with high quality comparison technology.


The City of Minneapolis installed 30 AQMesh pods in targeted locations, chosen with reference to the locations of potential VOC sources – such as foundries - and vulnerable communities. The pods measure NO, NO2


, O3 ,


CO and TVOC. The aim is to look for ways to reduce the exposure of local residents to harmful VOCs, such as benzene/BTEX. The two-year project will test proposed mitigation approaches.


Initially all 30 pods were co-located to show that they all read the same as each other, with any bias able to be easily corrected. Comparison against gas chromatograph (PAMS) allowed a breakdown of 60 VOCs present to be used to derive VOC-specifi c correction factors. Linearity was shown by an R2 of 0.68 with the pods operating uncorrected, and 0.92 with correction factors applied. Slope was shown to be 1.3 and 1 respectively, and offset around 2ppb.


The pods are taking measurements across 30 locations: one pod remaining at the reference site throughout the project with the rest positioned relative to air permitted facilities (likely pollution sources). Bag samples are being taken monthly as supplementary measurements, as part of the network, to identify which VOCs are present. These samples can then be used to determine the most appropriate correction factors to use for each individual AQMesh reading.


At the next stage of the project, Long Distance Scaling is used - an AQMesh technique for ‘network calibration’ which was inspired by an approach taken by Professor Rod Jones of the University of Cambridge with the 100+ AQMesh Breathe London pilot network. Hyperlocal events – the local ‘spikes’ – can be separated from more regional or background pollution events, by making comparisons across the whole network. Application of the right correction factors to TVOC spikes, and not background level, reduces the risk of overestimating pollution attributed to a particular source at a later stage.


Local spikes are identifi ed with confi dence and this is the starting point for pollution mitigation strategies. The next step is to understand where the spikes are coming from: local wind speed and direction information is used to create pollution rose plots. With an indication of the source and the VOC bag samples (identifying VOC variants) it is possible to use targeted correction factors to provide meaningful, quantifi ed estimates of the fugitive VOC levels being measured by each pod.


Throughout the two-year project, network readings will be compared against the pod remaining at the gas chromatograph station. The near real-time, continuous fl ow of data from the 30 pods is assessed automatically, looking for failures and data points of lower confi dence, and the network is scaled periodically. The same data QC approach is applied to each of the fi ve sensors in all of the 30 pods, to provide the full circle of data confi dence necessary to support mitigation investment and public sharing of pollution information for environmental justice.


More information online: ilmt.co/PL/Qejm


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