Air Monitoring 45


New Mercury Emissions Monitor


Gasmet (Finland) will launch a new continuous mercury monitoring system (CMM) for stack emissions at Mercury 2013. Offering very low detection limits without interferences, the Gasmet CMM is simple to operate, with lower


operational costs than other systems.


Gasmet Europe’s Antti Heikkilä says “The CMM employs cold vapour atomic fluorescence (CVAF) to deliver very low detection limits at a significantly lower cost than other comparable mercury monitoring instruments.


“We have already installed systems in Finland and Poland, and initial users have been delighted with the CMM’s ability to measure low Mercury levels without cross-interference from gases such as Sulphur Dioxide. No separate chemicals, gold amalgamation concentrators, air scrubbers or additional gases are required, so operational costs are also very low.”


Legislation to limit mercury emissions from combustion processes is progressing quickly in many parts of the world, but process managers have already started to implement mercury monitoring programs. Antti says “We have received enquiries from companies that need to prepare for compliance by better understanding their mercury emissions. However, we are also being contacted by process managers, for example from Sulfuric Acid manufacturing plants, who wish to control Mercury; not just in their emissions, but also in the end-product, by measuring directly in the process stream itself.”


The CVAF spectrometer has an integrated high temperature converter to effectively transform mercury compounds to atomic mercury without any chemicals or vulnerable catalyst materials. The close coupling of converter and fluorescence cell also ensures that Mercury does not recombine to, for example, Mercury Chloride between the converter and the Mercury Analyser. Sample gas dilution with synthetic nitrogen generated within the CMM system is an effective tool to promote sample transportation whilst decreasing the loss of


Hg0 fluorescence signal to interactions with O2, CO2, and H2O. The fluorescence cell is specially designed to eliminate stray reflections and


background light so that even with sample dilution the CMM system is capable of monitoring low levels of mercury as required in the forthcoming US Clean Air Mercury Rule.


The system is controlled through a touch screen control panel, which is integrated with the analyser and calibrator inside an air-conditioned cabinet, and calibration is maintained with regular automatic zero and span calibrations using Hg0 and HgCl2 calibration gases generated within the CMM system - typically every


24 hours. Periodic linearity checks with atomic mercury or mercury chloride are also possible.


The Gasmet CMM is now available from a worldwide network of subsidiaries and distributors; however visitors to Mercury 2013 (www.mercury2013.com Edinburgh, Scotland, 28th July – 2nd August) will be able to meet some of the Gasmet staff that have been involved in the development of this technology at stand No. 24.


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email: 29ad@reply-direct.com www.envirotech-online.com IET Annual Buyers Guide 2013


Multiplex Industrial Gas System Installed in Saudi Arabian Aluminium Plant


Unisearch Associates (Canada) recently delivered 8 of their 12-channel LasIR Multiplex Systems to Maaden Aluminium Company, based in Saudi Arabia.


These 8 analyser controllers will allow the plant to measure Hydrogen Fluoride at 76 different locations in the plant, still allowing room for 20 additional channels as spare. Previously Maaden’s technicians had needed 76 analysers to achieve this.


The Unisearch system was chosen not only because of the financial saving made – but also because of its robust design, ideal for an aluminium plant located in a desert, and the strength and reliability of its analyses. The laser is far more powerful than many other units available to the market, this allows accurate measurements to be even made over very long paths (over 1 Km) or in short paths in presence of significant dust loading, 15g/m3


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and over. In addition, these units require no calibration and minimal maintenance. 25096pr@reply-direct.com


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