Air Monitoring 37 Safe and Reliable Sulphur Monitoring at ppb Level in Hazardous Areas


In 2009, Chromatotec (France) launched their first version of the MEDOR Exp cabinet specifically for sulphur monitoring in hazardous areas. Initially, the MEDOR analyser attained Class 1 Div 2, group C&D USA certification for operating in hazardous areas. It received CSA International recognition shortly afterwards.


Chromatotec then offered a full package including MEDOR and ChromENERGY for gas quality control dedicated to petrochemistry, refineries and gas storage areas where ATEX Zone 2 Ex II 3G Ex pz IIC T4 is required. The MEDOR unit can detect sulphur compounds at trace levels whilst the ChromENERGY allows its users to quantify C1-C6+ Hydrocarbons and provides simultaneous Calorific Power Index value measurements. Results are obtained at a glance with VISTACHROM software installed on a unique embedded computer.


Currently, Chromatotec’s analytical technology is under process to obtain higher certification level for ATEX and CSA. The Exp cabinet is protected by continuous flow with an X or Z purge system certified for Zones 1 and 2 respectively. This purging system includes a pressure regulator with a flow restrictor to control the inlet dilution. A flow controller is located at the valve outlet to validate the flow out of the cabinet. The cabinet is pressurised and diluted continuously.


An IP 66 class waterproof case allows the use of the unit in environments in which their is potential for a direct ingress of water to the unit and reduces the instrument air consumption volume needed for continuous dilution. H2S, mercaptans and total sulphur can be analysed by MEDOR Exp with only nitrogen required for analysis and integrated calibration.


One of the main advantages of MEDOR is that there are no additional hazardous area created within the analyser as can be the case with hydrogen or air presence and a flame. The worst case is taken into account to calculate the dilution flow to stay under the explosive level. If pressure inside the cabinet is not higher than ambient pressure, the power is switched off by the X-purge system. For service there is a bypass key to open the cabinet without effecting pressure inside.


New Passive Air Sampler Employs World’s First Cloned Moss


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Under European air quality directive 2008/50/ EC, member states are required to monitor, assess, manage and report on national air quality. Traditionally, active sampling instrumentation, such as particulate matter samplers, have been the favoured approach to assessing ambient air quality. However, this can be a costly and time consuming method of data collection.


As a result of the EU FP7 project MOSSCLONE, a new cost-effective passive air sampler has been developed called ‘mossphere’. It employs the


world’s first cloned moss which has been cultivated on a large scale to produce a highly pure homogenous material.


Terrestrial mosses display an excellent efficiency in loading both particulate and gaseous determinants of heavy metals, inorganic, organic and radioactive pollutants. The mossphere was designed to exploit this efficiency. The mossphere marks the next generation in passive sampling technology and is leading the way when it comes to low cost, precise passive sampling of particulate matter, metals and polycyclic aromatic hydrocarbons. This product will be launched onto the market over the coming months by T.E Laboratories, an innovative Irish SME specialising in environmental analysis.


New Remote Air Quality Monitor


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Atmospheric Sensors (UK) are pleased to announce that their Model 510 Remote Air Quality Monitor is now deployed in 5 European countries, where the units are providing 24 hour monitoring of polluting gases and particles, together with information on ambient noise and measurement of


temperature and relative humidity. A GPS module is used to provide location information and an accurate timestamp. The Model 510 stores measured data on a local, non-volatile, file system and uses an automated FTP link on the widely-available GPRS network to transmit data to a central monitoring station.


The Model 510 can be ordered in a range of specifications to suit different customers’ requirements. Four electrochemical gas sensors can be selected from a range in order to provide responses to different gases. Typical choices are NO2


, NO, CO, O3 , SO2 and H2 S. Please


contact Atmospheric Sensors for other gases. Optional fitments include a CO2


NDIR sensor, a laser optical particle counter and a PID to monitor volatile organic compounds.


The unit is supplied in a weather-resistant case and an optional sun and rain screen will be available at a later date. The unit generally runs off mains electricity as a fixed installation, but other options can be discussed.


Atmospheric Sensors produce a range of innovative atmospheric and laboratory instrumentation ranging from high-capability, wearable atmospheric monitors to advanced semiconducting metal oxide gas sensor management systems.


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New Sample Gas Coolers –High Performance with Low Wash-Out


For continuous extractive gas analysis, reliable sample gas coolers are essential to ensure that the sample gas is cooled down to a constant low temperature. At this temperature the water vapour inside the sample gas condensates and can be removed before the gas stream reaches the analyser. This step is crucial to protect the highly sensitive gas analysers from downstream damage caused by condensate.


In addition, depending on the method of measurement and the measured gas components, water vapour cross-sensitivities may occur. In this case the analyser takes the water vapour for the gas component that needs to be measured and falsifies the actual measured value. For this reason not only a lower, but also a constant water vapour dew point is important. With a varying dew point or water vapour content the measured value would also change.


Another important requirement for a sample gas cooler is that the measured values are not corrupted by the wash-out of water soluble gas components such as SO2


or NO2 .


To meet these important requirements JCT Analysentechnik GmbH (Austria) has constructed an entirely new sample gas heat exchanger, which guarantees a reliable separation of water vapour combined with low wash-out rates. Depending on the application, customers may choose from different heat exchanger materials such as PVDF, Duran glass, stainless steel or corrosion-resistant coated aluminum.


This new heat exchanger is built-in in the new high-performance series of Peltier coolers JCM-300, which can be used for ambient temperatures up to 50°C, and in the new compressor cooler series JCS-100. Thanks to the new heat exchanger design both series are extremely powerful for both high flow rates and for high water vapour concentrations. They provide a highly accurate long-term stable outlet dew point even under changing loads.


All sample gas coolers can be supplied with integrated condensate pumps for reliable condensate disposal. An LED temperature display is standard with the JCS-100 series and can be optionally selected for the JCM-300 series. For safe operation all coolers are equipped with a temperature alarm contact. An integrated condensate detector in the sample gas outlet of the JCM-300 series can be selected optionally. The integrated status contact can be used to turn off the sample gas pump in case of malfunction. Thus the gas analyser is protected against damage due to condensate at all times.


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- Accurate Detection of Formaldehyde htV-m


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5790ad@reply-direct.com www.envirotech-online.com IET January / February 2016


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