Air Monitoring 39 Choosing AQMesh for fenceline monitoring
AQMesh has been long established as the most proven small sensor system for the air quality monitoring market. With an ever-increasing suite of measurement options and proven performance in the harshest environments, AQMesh is ideal for industrial applications.
The H2 S, SO2 , TVOC and PM sensors allow AQMesh to be
used in a wide range of applications including construction, mining and oil & gas. AQMesh networks have been implemented across mining facilities in Southern Africa, Saudi Arabia and Australia, as well as oil & gas facilities in Europe, Central Asia and the Gulf region. Other applications
include perimeter monitoring on energy from waste sites, residual emissions from fl ares and even volatile volcanic emissions in Iceland and Nicaragua.
A single AQMesh pod can measure up to 6 out of a possible 8 pollutant gases in various combinations, as well as PM, humidity, atmospheric pressure and noise in one small, compact easy-to-install unit. A wind speed and direction sensor is also available, and there is a range of wireless power options, including the bespoke AQMesh smart solar pack. The solar pack offers autonomous continuous power all year round for an AQMesh pod and features smart connectivity with a mobile app for checking power output, viewing historical data and running diagnostics.
Customers across industrial applications comment on how easy AQMesh is to use, from its quick and easyinstallation to its low maintenance requirements. Users also benefi t from maximum uptime across their networks, thanks to AQMesh’s robust hardware, wireless communications and the secure
AQMeshData.net server. Remote diagnostics allow pods to easily reconnect themselves and continue to capture data if power is ever interrupted. Faults or failures can be detected, diagnosed and resolved swiftly and remotely, without the need to visit the equipment. Additionally, email exceedance alerts can be set on any data channel, allowing for instant critical information that may be vital for managing related processes or protecting site equipment and staff.
AQMesh is on the road to MCERTS, and looking to achieve both MCERTS & CEN certifi cation in 2023, based on its already proven performance for PM2.5
and PM10 . The proprietary optical particle counter
consistently delivers high accuracy across all PM fractions, and use of a heated inlet offers even more accurate readings as it dries the sample prior to measurements to reduce the effects of moisture. New developments in hardware and completely traceable data processing algorithms will also offer even further improvements in accuracy later this year.
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AQMesh delivers accurate PM coarse measurements
Many small sensor air quality monitoring systems cannot reliably measure coarse particulate matter, or PM10, because of the technology they use. AQMesh’s proprietary optical particle counter (OPC) delivers high out-of-the-box accuracy across all key particle matter (PM) fractions thanks to its bespoke, in-house design. Measuring PM1 PM2.5
, , PM4 , PM10 , PM-Total (up to 30 microns)
as well as Total Particle Count, the proven OPC uses the most direct path possible between the sample inlet and measurement chamber. This allows more coarse particles in the sample to be measured compared to off-the- shelf OPCs and nephelometers, where these particles can be deposited in a maze-like pattern before being measured. Humidity-related challenges have also been addressed by the AQMesh team. In some areas of high relative humidity, certain types of particles can absorb moisture from the surrounding environment (known as deliquescence), which can make them appear larger in diameter and result in erroneous readings. In most cases AQMesh can detect when this is happening and add a fl ag to the data point, allowing for it to be easily identifi ed, reviewed and redacted as part of a robust data QA/QC process. Additionally, the OPC used in AQMesh has the option to include a heated inlet, which dries the sample prior to measurement and further reduces the effects of deliquescence. This option results in less than 1% of the data points being fl agged and ensuring more consistent data accuracy. Other benefi ts of the AQMesh OPC include its reduced maintenance schedule compared to other sensors – there is no need to change any fi lters, making it the ideal solution for industrial applications where critical processes create higher levels of particle pollution. Active sampling is performed with a pump instead of a fan, which means less turbulence in the measurement air fl ow and eliminates the opportunity for vacuums to affect the sampling accuracy. There is also no need to replace the whole OPC unit when it requires servicing - only the parts that need changing are replaced so the product remains sustainable whilst keeping the ongoing cost of ownership low.
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