46


Air Monitoring


Innovative Measurement of Mercury in Flue Gases


Mercury limit values must be kept within the µg-range. For this reason, measurement devices must be extremely sensitive and highly accurate. The MERCEM300Z from SICK (Germany) with its patented direct measurement system is a high- performance mercury analyser for providing reliable measured values of elemental and ionic Hg in gases at any time.


It is not only fossil fuels which release gaseous mercury. Especially in waste incineration plants or crematoriums, it is particularly important to take batteries, semiconductors and dental


fillings into consideration. For Europe, the


approved limit values are specified in Directive 2000/76/EC WID. However, industries are increasingly being called upon to meet obligatory specifications worldwide.


There are numerous mercury analysers on the market, but none of them can match the MERCEM300Z: It monitors mercury in flue gases quickly and reliably without external conversion – down to the lowest certified measuring range of 0 - 10 µg/m3


. This represents a concentration


considerably lower than the generally accepted emission levels of SO2, NOx or dust. This quality of measurement combined with long maintenance intervals of 3 months simplifies the task of continuous


monitoring, making the MERCEM300Z an outstanding mercury analysing system.


The MERCEM300Z combines thermal conversion at high temperatures with Zeeman-AAS analysis in a unique, compact, user-friendly analyser. Hg measurement directly in the hot cell is patented and has been licensed exclusively for the MERCEM300Z by SICK. The direct measurement system immediately detects even minute Hg concentrations in the hot converter. There is no chemical conversion, no solid matter converter, no gas cooling − all of which can cause measurement results to be falsified. And thanks to the Zeeman AAS method, the measurement is simultaneously immune to interference components.


All in all, the thermal conversion at temperatures of around 1000°C and the detection of Hg immediately after conversion in the undiluted sample ensures extremely precise results at low cost. This has been repeatedly verified by test installations both in Europe and the USA.


Reader Reply Card No. 155


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Meteorological Instruments


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Reader Reply Card No. 158 AET Annual Buyers’ Guide 2012 www.envirotech-online.com


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In the beginning of the second quarter 2012 JCT Analysentechnik (Austria) will introduce a new heated gas sample probe based on the popular JES 301 design.


The JES 301L will reliably remove dust particles from the sample gas in applications with low dust concentration. This ensures that heated lines will not be clogged with dust particles.


A high power self limited heating element ensures that the gas reaches the analyser unchanged also in rough ambient conditions. The temperature of 180°C also avoids corrosion inside the probe.


Standard flanges allow easy mounting at the stack. Additionally the probe comes with a low temperature alarm contact for remote monitoring. The proven JCT connection system from probe to JCTs JH3F heated hose ensures no cold spots and no condensation at the junction.


Due to an intelligent product design the JES 301L offers easy, tool free and convenient maintenance. As a result the price performance ration during the lifetime is outstanding.


Reader Reply Card No. 157 New Heated Gas Sample Probe


Over 200 Systems for Accurate Rainfall Level Measurement Installed in Oman


Sultanate of Oman’s Ministry of Regional Municipalities & Water Resources (MRMWR) has recently installed additional Casella Monitor (UK) Tipping Bucket Rain Gauges (TBRGs) in the Arab country’s more remote mountainous and desert areas.


The MRMWR currently has in excess of 200 Casella Monitor TBRGs installed at a wide range of locations across Oman. The systems, which were originally chosen by the customer for their reliable performance during testing, as well as accurate data and ease of use benefits, have been customised by Casella to cope with the Oman’s harsh environment.


In accordance with the roles assigned to it in Royal Decree No 55/2006, the MRMWR relentlessly strives to provide water and municipal services to communities within the regions of the Sultanate, and establish vital facilities and infrastructure aimed at improving living conditions.


Ahmed Said Al Barwani, Water Resources Expert at the MRMWR comments: “Casella Monitor’s TBRGs are exceptionally user friendly, easy to install and require minimal maintenance. The overall service from the company is excellent and they were particularly quick to react when I requested some further improvements to the systems and hardware to cope with our dry, arid conditions.”


He continues: “They were very co-operative and made the required modifications without hesitation. As a result, the TBRGs continue to perform well in Oman’s harsh environment and provide us with accurate measurements of rainfall. This invaluable data allows the Ministry to fulfil its commitment of harnessing water resources, and making them available to communities, but also ensuring their rationalisation and conservation.”


Specialists in hydrology and rainfall monitoring equipment, Casella Monitor is currently basking in a 30% increase in sales of its high performance TBRG over the past 18 months. The system incorporates new calibration multi-point methodology, which Casella Monitor believes has resulted in one of the best, most cost-effective solutions on the market at present.


TBRGs are sensors for accurately measuring rainfall level and events such as thunderstorms. The Casella Monitor TBRG model is a reliable and extremely robust transducer, designed as a stand-alone sensor for operation within an existing logging system, such as the Casella Monitor Automatic Weather Station.


The unit comprises a divided bucket assembly which is pivoted at the centre. Rain collects in one side of the bucket, which then tips when a predetermined volume of water has been collected. The tipping action discharges the collected water and repositions the opposite side of the bucket under the discharge nozzle ready for filling.


Ahmed Said Al Barwani concludes: “The major advantage is Casella Monitor’s willingness to adapt its equipment to suit our special requirements. In fact, we are now in discussions with the company about the potential inclusion of a telemetry system to our existing TBRGs using GSM/GPS, which will then enable us to receive real time data.”


Reader Reply Card No. 154


A Revolutionary Analyser for Measuring the Air Quality


Environnement SA (France), in cooperation with the Laboratory of Physics and Chemistry of the Environment and Space (LPC2E) of the CNRS (French National Centre for Scientific Research), have developed a fully-optical and patented* particle analyser providing continuous information on the concentration, size and the nature of inhalable particles (TSP, PM10, PM2.5, PM1). Completely autonomous, automatic and capable of detecting short events with high precision, the CPA (Continuous Particulate Analyser) provides real-time access to measurement parameters. This process previously required the use of expensive laboratory instrumentation such as mass spectroscopy, chromatography and microbalance equipment. This unique instrument will reduce by up to 10 times, the actual expenses, required to obtain the relative information.


An instrument capable of measuring simultaneously and continuously all types of particles, the CPA also provides real-time information on the nature of the particles, allowing for differentiation between "natural" and industrial pollution.


Simple to install and use, the CPA possesses a smart and automatic adjustment system integrated. The CPA requires very low maintenance and no consumables. Equipped with a large colour touch screen and the new interface developed by Environnement SA, using the latest web technologies, makes the CPA controllable remotely from any computer, tablet or iPhone. The CPA employs a unique combination of technologies essential for the monitoring of air quality.


Reader Reply Card No. 156


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