Continuous Mercury Monitoring system (CMM)
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Gasmet Continuous Mercury Monitoring system (CMM) Gasmet Continuous Mercury Monitoring system (CMM) Gasmet CMM is a complete emission monitoring system designed to meet the regulations for continuous mercury measurement standards in different combustion sources, such as coal fired power plants or waste incinerators. Relying on proven technologies it is a robust, reliable, and cost-effective measurement system to meet the latest standards. The system has low need for maintenance and provides an excellent solution for demanding industrial measurement conditions like other Gasmet analysers. Gasmet CMM employs atomic fluorescence spectroscopy and thermal conversion of ionic mercury compounds to atomic mercury. No wet chemistry or gold amalgamation trap is needed. High inherent sensitivity of the atomic fluorescence spectroscopy enables extensive dilution of the sample gas. The diluted sample gas is transported to the analyser. Directly after thermal reduction of the mercury compounds the dry gas containing only atomic mercury is lead to the sample cell. Calibration of the whole system is performed with an automatic calibration unit capable of producing constant flow of atomic and (as an option) oxidised mercury Spectrometer with integrated thermal converter Operation principle: Detector: Source: Direct cold vapour atomic fluorescence (CVAF) in vacuum pressure Photon detection unit with photon counting Low pressure mercury vapour lamp Sample conversion: Integrated high temperature thermal converter Calibrator for Hg0 Operation principle (Hg0): Vapour generation from saturated source and dilution Calibration gas: Dried, and Hg scrubbed instrument air Dilution gas flow control: MFC 0 - 20 l/min Span gas flow control: MFC 0 - 20 ml/min Calibration concentration ranges converted to Hg0: Saturated Hg source: 1 - 50 jg/m3 Measurement parameters General parameters Measuring principle: Operating temperature: Cold vapour atomic fluorescence (CVAF) with extractive filtration, dilution, and thermal conversion Minimum range 0 - 10 |jg/m3. Minimum detection limit for total mercury 0.02 jg/m3 (complete system, with dilution) 5 - 40 °C, non-condensing, dust free ambient air Zero point calibration: Span calibration: Calibration linearity test: Zero point drift: Sensitivity drift: Linearity deviation: Temperature drifts: 24 hours 24 hours 1 week < 2% of measuring range per calibration interval < 2% of measuring range per calibration interval < 2% of measuring range < 2% of measuring range Instrument air preparation Storage temperature: Response time, T90: Power supply: -20 - 60 °C, non-condensing Typically < 120 s, depending on the sample line length and measurement time 100 - 115 or 230 V / 50 - 60 Hz Instrument air inlet: Instrument air filtration: Nitrogen generator: Calibration gas drying: Mercury scrubber: Vacuum pump: 6 - 10 bar, 60 Nl/min, 8 mm Swagelok fittings 3-stage filter unit Capacity 99 % N2, 8 l/min, 5-6 bars, efficiency ratio 20 % Absorption dryer, capacity -30 °C Absorption scrubber WOB-L Piston twin headed STREET ADDRESS: Pulttitie 8 A 1 00880 Helsinki, Finland

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