AIRMONITORING 29


A fast and accurate solution to mercury contamination monitoring


Trace H2S analysis in complex gas mixtures


Hydrogen sulphide (H2S) is a very fl ammable, corrosive and toxic gas, with a characteristic odour of rotten eggs. Even when present at low trace-level concentrations, H2S can damage equipment, pipelines and lead to catalyst poisoning. Therefore, it must be carefully monitored and controlled in industrial processes where it is generated or used.


Chromatotec® ’s H2 S MEDOR analyser measures H2S in gas samples at trace-level concentration


ranges (0-1ppm). It consists of an automatic process gas chromatograph (autoGC) equipped with a sulphur specifi c electrochemical wet cell detector (ED) which only reacts with sulphur compounds and provides excellent results down to 1ppb. All compounds have a linear response with the ED, with R2> 0.995. Moreover, theMEDOR® the sample, which can be up to 100% relative humidity.


detectoris not affected by the moisture in


The H2S MEDOR is available with a dedicated confi guration for safe and hazardous areas (ATEX, IECEx, CSA and CSA international certifi cations) including an integrated N2 generator. Its simplicity for online application in refi neries and petrochemical plants is achieved thanks to its fl ameless detector for which no hydrogen is required. Specially designed for on-fi eld deployment, this standalone solution includes a built-in nitrogen generator and a touch screen display behind the front door of the wall-mounted cabinet. It is temperature controlled for outdoor installation to provide the best performance for operation from -10 to +55°C.


Ion Science is highlighting the suitability of its ergonomically designed Mercury Vapour Indicator (MVI) for rapid and reliable mercury detection during decommissioning, demolition, repurposing or refurbishment of industrial plant, laboratories and other premises.


Environmental pressures and subsequent legislation* to control hazardous substances has resulted in a sharp decline in the use of mercury although it remains an important chemical in many industrial processes, including the production of chlorine, cement, caustic soda and sulphuric acid and a wide range of products.


Exposure to excessive levels of mercury can permanently damage or fatally injure the brain and kidneys. Elemental mercury can also be absorbed through the skin and cause allergic reactions.


When properly contained and controlled, mercury can be used safely. Problems start when premises that have historically used the chemical are demolished, decommissioned, repurposed or refurbished. It means mercury that has been contained for decades can be released into the environment.


Ensuring that facilities are safe during construction and that there is no health risk associated with any repurposed land and new or refurbished buildings when they are occupied places an emphasis on effective contamination monitoring.


Ion Science’s MVI is a revolutionary handheld instrument that can detect mercury in just three seconds. The MVI’s dual beam UV technology eliminates the problem of saturation and the need for regeneration between readings, maximising its availability and uptime.


Fast and accurate, Ion Science’s MVI provides continuous readings and offers two detection ranges of 0 – 200 µg/m3 (res. 0.1 µg/m3


) and 0 – 2000 µg/m3 (res. 1 µg/m3 ). These two


ranges provide critical coverage for the OSHA PEL at 100 ug / m³ and the IDLH at 1000 ug / m³


A high-performance pump ensures fast indication and recovery and the instrument’s audible alarm and large digital display clearly indicate the levels of mercury present.


Other conventional monitoring technologies have limitations. For example, cold vapour atomic absorption is excellent at detecting sub parts per billion (ppb) concentrations of mercury but is far too sensitive for use industrial premises and will over- range, making it impossible to pinpoint mercury sources.


Gold fi lm mercury vapour instruments offer a much wider range but are quickly saturated and then have to be regenerated away from the contaminated area before they can be used again.


Ergonomically designed for simple, one-handed operation, the MVI is the ideal survey unit for rapid and reliable mercury detection. It helps to pinpoint mercury sources in even the most challenging environments.


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The versatile and robust H2S MEDOR analyser has been used for H2S measurement in a recycle gas stream composed of up to 60% of H2 as well as in reactor’s effl uent gas with very high concentrations of COS (5000 ppm).


The H2S MEDOR is a reliable, simple and robust turnkey solution. It is fully autonomous thanks to its integrated gas generators which avoid the need for gas cylinders and embedded, internal calibration for automatic data validation. Moreover, this process analyser is designed to have very low maintenance requirements.


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JCT Analysentechnik GMBH has developed new and advanced components for sample gas handling and conditioning for continuous gas analysis systems (CEMS and Process). These include new sample probes for hazardous areas (ATEX zones 1 and 2) with operation temperature of up to 180 °C, new sample handling systems for total mercury analysers, as well as the sample gas conditioner JCS-100 with the most advanced heat exchanger JHEX4 with the proven lowest wash-out rate of water soluble compounds (SO2


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, NO2 ).


The sample probes models JES-360, JES-370, and JES-370 Dual for NH3 and NOx analysers enable continuous sampling even at extremely high dust concentrations above 1000 g/m³ (!). The probe incl. all components are heated to temperatures up to 315°C (safely above the limit temperature of 225°C below which ammonia salts are formed, clogging sample tubes and fi lters with crystalised salts). The NH3 analyser is connected with high temperature (> 250°C) heated sample lines at the hot fi lter outlet. For NOx analysis the sample gas from a second fi lter outlet fi rst passes through an ABS Filter, effectively removing ammonia salts.


JCT Analysentechnik GMBH will be present during CEM 2020 on stand no. 48 For More Info, email:


51547pr@reply-direct.com A simple and effective solution to chlorine generation


Chlorine (Cl2) has always been a diffi cult gas to handle when using traditional gas cylinders. It is very reactive and problematic in terms of accuracy and its erratic shelf life. This has made life diffi cult for personnel working across a wide range of industries, such as in the water treatment sector.


With this in mind, Euro-Gas designed and developed their GazCal Gas Generator, which is now an indispensable tool for people working with chlorine gas. Engineers within the water industry fi nd this rugged, portable and battery-operated tool ideal for testing and calibration, both in the lab and in the plant. The GazCal comes in a robust and compact carrying case and enables rapid testing and calibration with negligible warm-up time. This simple to use device can be operated by anyone! Simply set the necessary PPM level via the unit’s dial-up digital display and it is ready for action. The Gazcal generates Cl2 levels ranging from 0.5 – 20 ppm and is also suited to act as a surrogate for cross-calibration of ClO2, O3 and F3.


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Euro-Gas have designed the GazCal to overcome the usual problems of a low shelf life. Cell life is only used up when the unit is in operation, whilst traditional cylinders can simply die out after up to 6 months. The generator can therefore last for up to a decade, often without the necessity to change the cell and needing only a yearly recertifi cation of calibration, which can be carried out by Euro-Gas or qualifi ed technicians at the site.


The GazCal cell has a lifetime of 500ppm hours, equating to 100 hours of constant use at a 5ppm concentration level, which enables a minimum of 400 individual calibrations. Operators can see the life span of the generating cell on the unit’s cell life indicator. Once the cell is used up, a new generating cell can be installed easily. Depending on the level of experience that the engineer has with gas detection calibration, regular small gas cylinders will usually only perform around 5 – 10 calibrations per cylinder. The GazCal may initially be more costly than a small cylinder but in the longer term, the generator will be far more economical.


“Climate change is no longer some far-off problem; it is happening here, it is happening now. – Barack Obama


”


Moreover, gas cylinders only attain one specifi c concentration per cylinder purchased, say for instance 5ppm of Cl2, whereas the GazCal is totally adjustable between the 0.5ppm to 20.0ppm range and in 0.1ppm steps. Therefore, the Gazcal produces many different concentration levels from one device. In addition, low concentrations of Cl2 are effi ciently produced with the GazCal, even 1ppm and 2ppm levels, whereas it is extremely problematic to achieve cylinder stability at low concentration levels.


More information online: ilmt.co/PL/3vOB For More Info, email:


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51266pr@reply-direct.com WWW.ENVIROTECH-ONLINE.COM AET ANNUAL BUYERS’ GUIDE 2020 50970pr@reply-direct.com Advanced sample handling and conditioning


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