50 Air Monitoring Contributing to the emissions monitoring of tomorrow
KNF’s versatile N 630 gas pump series for Ex and non-Ex areas offers robustness, durability and long service life. All Ex and non-Ex versions are available as a single-headed model or with twin heads connected in parallel or in series. Users who wish to double down on leak-tightness can do so by choosing a model featuring an additional double diaphragm. This is typically needed for noble gas or hazardous gas applications. An optional water-cooling system can also be installed to enhance non-Ex versions to handle environment and media temperatures of up to +60 °C.
The non-Ex versions are equipped with either an EPDM or a PTFE-coated diaphragm, the Ex-version with a PTFE-coated diaphragm. Pumps from the N 630 series can achieve fl ow rates of up to 68 l/min, an ultimate vacuum of up to 25 mbar abs as well as pressure of up to 12 bar g. The protection class of the pump section is IP20, and the motor offers IP55 protection. It can be used at 50 or 60 Hz and is designed to be operated with a frequency converter. This allows the pump’s rotational speed to be set to any operating point.
The chemically resistant and oil-free N 922 vacuum pump transfers media reliably and with low maintenance requirements. Depending on the area of application, the diaphragm and the valves of the N 922 only need to be replaced about once a year. Few wearing parts, long periods between required maintenance work and low inspection costs all add up to advantageously low operating costs. The gas transfer pump is now also available in two new non-Ex versions and a new Ex version, all with stainless steel pump heads, making it suitable for even more applications. The new models are highly leak-tight in keeping with KNF’s standards, and they feature substantially higher values in all the key areas compared to previous PTFE pump head versions, with a fl ow rate of up to 25 l/min, up to 110 mbar abs depth of vacuum and up to 6 bar g of pressure. This makes them particularly convenient as sample gas pumps for stationary emissions measurements. To allow for geodetic discharge of condensates, the compressor housing in the N 922 can be moved in increments of 90 degrees separately from the motor.
In non-Ex versions, users can choose from three separate AC motors. With the IP20 protection class, the single-phase AC motor with a terminal box covers a broad voltage range of 100–120 V at 50/60 Hz, as well as 200–240 V at 50/60 Hz. An additional IP54 protection class single-phase AC motor with a terminal box covers a voltage range of 100–120 V at 50/60 Hz, 230 V at 50 Hz, as well as 220 V at 60 Hz. Another IP54 protection class motor is the three-phase AC motor for 230/400 V and 50/60 Hz that can be operated with a frequency converter. The Ex de motor with protection class IP66 is ATEX-compliant and certifi ed to IECEx (incl. CCOE, NEPSI, KOSHA). The N 96 pump series for complex operating profi les in gas sampling analysis is small, light and high-performance – key qualities that manufacturers of portable measurement, monitoring and analytical systems require from pump technology. What’s more, the N 96 gas sampling pump also accommodates complex operating profi les. This dynamic profi le is made possible by an effi cient, brushless DC motor featuring a PWM control loop setup. The N 96 emits relatively little heat itself while being suited for use at ambient temperatures of up to 50 degrees Celsius. The pump can start up without discharge in the range of 2.5 bar relative pressure / 100 mbar abs vacuum. The fl ow rate is as high as 8.5 l/min. If necessary, the maximum positive pressure can be increased to up to 4 bar g.
When used for gas analysis, the pump transfers reliable and precise liquid or gaseous samples for evaluation. The EPDM- or PTFE-coated diaphragm ensures safe use with aggressive and/or corrosive media. Its chemically resistant design and very high tolerance of vapor and condensate means the N 96 can be used with a broad spectrum of media at temperatures of up to 70 degrees Celsius. These pumps can transfer, evacuate and compress media oil-free and without contamination. The N 96 pump series features compact versions with AC/DC converter and PPS, stainless steel or aluminum pump heads. This allows for a broader range of applications, now encompassing the handling of valuable or hazardous gases such as tritium. Demanding media which may require optionally greater gas tightness – such as hydrogen, nitrogen and helium – can also be handled safely. The wide-range power supply unit mounted to the compressor housing enables the pump to be used across the globe, regardless of the local power grid specifi cations. The pump head can also be rotated in 90-degree intervals, allowing for the connections to be positioned as needed. Fastening holes located on the side of the pump housing facilitate tubeless connection via o-ring adapters attached to a manifold.
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North American project unlocks the potential for small sensor air quality networks with AQMesh
A recent study using a network of fi ve AQMesh pods has found that small sensor systems with a properly managed QA/QC process offer valuable air quality measurements, complementing data from expensive reference equipment. Networks of small monitoring nodes, such as AQMesh, can be easily installed in local areas to identify pollution sources and expand the scope and understanding of air pollution across a city.
Following on from the initial deployment of the fi ve pods across Kitchener, Canada, in 2020, the team leading the project have now published their paper outlining the initial results of this study.
SMALL SENSOR AIR QUALITY MONITORING SYSTEM
THE PROVEN
URBAN AIR QUALITY
TRANSPORT TERMINALS
The fi ve AQMesh pods were installed near elementary schools, supplementing the city’s only reference station, in order to demonstrate how pollution varies over short distances. Data from the pods highlighted the need for city-wide networks of small sensor air quality monitoring systems to build a more accurate picture of local pollution levels.
As part of the AQMesh team’s development into improving QA/QC methods for air quality monitoring networks, a network comparison method was used to put the pods through a rigorous QA/QC process. Data from the pods was validated through pod-to- pod comparison, while also providing traceability back to the reference instrument. The process works on the principle of identifying and separating local pollution events, leaving just the regional pollution which all pods and reference equipment respond to. This then provides a comparable data set for scaling via linear regression analysis.
Based on the confi dence built by the QA/QC process, data from the pods indicated that levels of nitric oxide (NO), nitrogen dioxide (NO2
), ground level ozone (O3
matter (PM2.5) were mostly traffi c related. Project leader, Dr. Hind Al-Abadleh, from Wilfrid Laurier University, hopes knowledge of how this source affects pollution levels in Kitchener will help speed up the electrifi cation of the city’s transit system as well as encourage parents and carers to walk or cycle to school instead of drive.
CONSTRUCTION OIL & GAS CONSULTANCY
The project was loosely based on the ground-breaking Breathe London pilot in the UK, in which 100 AQMesh pods were used to create a hyperlocal air quality monitoring network and publish a real-time pollution map online. Similarly in the USA, 50 AQMesh pods were deployed across Minneapolis – St. Paul. The team in Kitchener hope to expand their network in the same way with more AQMesh pods.
• Most experienced team in the industry • Customisable platform • Short & long term rentals • Low maintenance
• Quick & easy to install • Free remote upgrades • Free data download
Enquire now for the best air quality monitoring system and outstanding customer support
www.aqmesh.com |
info@aqmesh.com +44 (0) 1789 777703
www.aqmesh.com |
info@aqmesh.com | +44 (0) 1789 777703
Tom Townend, AQMesh Product Manager, who worked closely on the project, says “The team from Wilfrid Laurier University and Hemmera Environmental Consultants have shown a great understanding of how to maximise the use of a small network to provide high quality data. The network analysis method used, alongside the latest AQMesh processing algorithms, allowed for frequent and detailed QA/QC of the network. This project shows how much can be achieved with even small networks of AQMesh pods across a city, and how they can provide the level of confi dence and verifi ed detail required by a wide range of air quality professionals.”
Please contact the AQMesh team to get more information on the QA/QC processes followed and how this might be used if your own network of AQMesh pods.
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IET MARCH / APRIL 2022
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