Largest Independent Manufacturer of Calibration Gases 14 Gas Detection


Scientific and Technical Gases is the largest independent UK prime manufacturer of Calibration Gases. We supply high precision custom made gas and liquid mixtures for all analytical, detection and process applications, in a range of cylinders. STG can supply calibration gases in lightweight portable non-refillable cylinders, including our 112 litre aluminium cylinder, used extensively in the gas detection and water industry. We are now a selected international distributor of ACD Gas Generators, providing on-site generation of H2


S, HCN, H2 , ClO2 and Cl2 .


We are also pleased to announce our Marine Service, which is dedicated to ensuring calibration gases meet ships and vessels worldwide with short delivery windows. PSI Speciality Gas Engineering, our sister company can design, supply, install and commission a complete range of gas systems ranging from GC installations through to complete speciality gas plants. It also specialises in providing Written Schemes to companies throughout the UK.


Reader Reply Card no 50


State-of-the-art Single Gas Detector and Docking Station


Gas Control Panel Now SIL 3 Approved


First Portable MCERTS Landfill Gas Analysers


The MICRO IV by GFG Europe (UK) is the new state-of- the-art successor to the popular MICRO III single gas detector. Besides simple operation and powerful alarms, MICRO IV offers a large event-logging memory, IR interface and compatability with GfG’s revolutionary new docking station.


The event memory saves all important data when was the alarm triggered? (date and time). Which alarm was triggered? (A1, A2, A3, TWA, STEL). Which gas concentration was present? Data can be extracted and manipulated on a PC.


The MICRO IV-Dockingstation is a trendsetting management-system, which enormously reduces cost of ownership and duration of calibration. The docking station checks the acoustic and optical alarm functions, device errors, alarm thresholds and response times of the MICRO IV. The bump test comprises of Response time, Alarm thresholds, Alarms (optical and acoustic), Software, Device and software identification, Device errors. Up to 6 MICRO IV can be automatically bump- checked or calibrated simultaneously. The docking station reduces the daily time required for calibration and function test (bump test) dramatically. Operation could not be simpler – Green light is PASS, red light is FAIL. Due to its’ small size the Dockingstation can be placed almost anywhere. No external PCs or modules are required.


MCERTS, the Environment Agency's Monitoring Certification Scheme has its first portable landfill gas analysers. Geotech (UK) reveals the first MCERTS portable landfill gas analysers to meet the EA’s ‘Performance Standards for Portable Emission Monitoring Systems’ are the Geotech GA2000+ and GEM2000+. With MCERTS set to become the instrument performance standard for Environmental Permitting Regulation (EPR) sites, landfill operators, local authorities and brownfield site contractors will welcome availability of suitable portable gas analysis equipment. Geotech also confirmed that users can upgrade many of the existing analysers currently in service. For brownfield consultants, contractors and local authorities, additionally important is the news that all Geotech gas analysers, which measure flow, now meet CIRIA guidance to sample flow before a gas reading. Guidance is detailed in its publication, ‘Assessing risks posed by hazardous ground gases to buildings (revised) (C665)’. Set to measure landfill gases which usually include methane, carbon dioxide, oxygen, carbon monoxide and hydrogen sulphide, Geotech gas analysers are also used for brownfield site investigation and gas sampling. For that construction industry activity CIRIA guidance applies. Now consultancies and councils can comply with ease, thanks to Geotech product changes.


Speaking when handed the news of a satisfactory EA MCERTS audit, Geotech’s UK sales manager, Simon Sheridan said, “We are very pleased that for all users of Geotech gas analysers, the confirmation of performance to the demanding MCERTS standards will assist them in demonstrating full EA compliance. For our brownfield and consultancy customers who have been asking to sample gas to CIRIA guidelines, we now have a product available.”


Reader Reply Card no 53 Reader Reply Card no 54 Cross-Sensitivity Lowered by H2S Sensors


Membrapor (Switzerland) has successively lowered the Cross-sensitivity of its H2S-sensors. The type H2S/C-50 for measurements in the range of 0 – 50 ppm H2S exhibits an interference to CO of only 0.4%, which is an unbeatable figure. The product line has now been developed for concentrations of up to 5’000 ppm of Hydrogen sulphide. Also with the


Hydrogen sensor H2/CA-1000 the cross-sensitivity to CO could have been lowered further and is now as low as just 1%. A shortening of the response time has been achieved with the SO2-sensors. They show now a t90 < 20 seconds and an extremely stable signal over extended time. A new replacement of the 3-Series, the SO2/SF-100-S (Range 0-100 ppm, overload at 500 ppm) has been launched. This Slim-sized sensor represents our product line for flue gas analysers, which


exhibit a quality you can rely on under the harsh conditions of emission gas monitoring. The housing of the Compact-size has been redesigned to offer the robustness and durability required for industrial applications. It allows for a Compact sensor to be easily mounted on an exhaust pipe ensuring full functionality. The favoured HCl-sensor in the Compact-housing is now available with a measurement range of 0 to 200 ppm.


For the same concentration range the new ozone sensor O3/C-200 has been introduced. In the Miniature-housing, a two-electrode variation of the ammonia sensor has also been released. Due to continuous efforts in development at the research centre in Zürich a product range of sensors for 16 gases has been successfully established. Membrapor has further extended its market position as independent sensor producer for toxic gases. All of the more than a hundred different sensors are produced in Switzerland and supplied to the world’s gas detector manufacturers for flue gas analysers, personal safety monitors, fixed-point detection systems, portable gas detectors, breath checkers and air quality monitors.


Reader Reply Card no 55 October/November 2008 AET


The new Low Cost FGD10 series of explosion proof gas detectors from Status Scientific (UK) is now available for the detection of flammable gases and carbon dioxide using miniature infrared sensors.


Depending upon the flammable gas to be measured, detectors with the ranges of 0-100% LEL and 0- 100% Volume are available. The infrared sensors used are advantageous over standard pellistors because they are fail safe, have a longer life expectancy (+5 years) and are temperature compensated.


There are a variety of sensors that can measure between 0-500ppm and 0-100% Volume for carbon dioxide. Also available are detectors for oxygen and various toxic gases.


Depending upon the application, there are 2 variants in the series; The FGD10A has a display and can be calibrated using magnetically operated switches. The FGD10B has no display and calibration of this unit is via internal zero and span buttons. Both detectors have ATEX and IECEx certification, 4-20mA output and plug in replaceable sensors. The detectors have been tested to and passed EMC


standards and the infrared sensors have temperature compensation from -20C- +50C.


Reader Reply Card no 56


Galileo SMS gas control panel from Sensitron (Italy) has been designed and approved to comply with the SIL (Safety Integrity Level) requirements according to the European Standard EN50402 on Functional Safety and has reached the SIL 3-C Level. Extremely flexible and highly reliable, it allows monitoring gas detectors connected with both 4-20 mA transmission and on addressable loops.


The functional safety is aimed to supervise and manage the behaviour of a system in case of failures. When defining the system structure all possible different types of failures that may occur in any part of the system are to be considered and evaluated. The control unit’s main board is designed around 2


powerful microprocessors, that communicate one to each other the monitored data ensuring the complete availability of all main board functions even in the case of a failure in one microprocessor. A broad range of self- testing facilities are implemented to detect and localize possible faults.


Reader Reply Card no 152


New Low Cost Explosion Proof Detectors


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