Gas Detection 13 Advanced Gas and Methane Drainage Monitoring Systems For UK Coal


Thoresby Colliery has been equipped with the latest Trolex Sentro 8 gas and environmental monitoring system and also a Trolex Sentrum methane drainage monitoring system. An intensive two-year development programme by Trolex (UK) on Sentro 8 resulted in a new concept in environmental and gas detection. An integrated multi-purpose sensing station ready to be configured to meet gas detection and condition monitoring requirements without the need for complex investment in system design or the need for specialist back-up. The system features intelligent inter-changeable sensing modules served by universal data communications architecture, making it straight forward to network sensor stations to a master computer and expand the system if required at a later date.


Sentro 8 is so named as it can accommodate up to 8 pre-calibrated sensing modules. These sensing modules are literally intelligent ‘plug-and-play’ elements, each with its own processor for intelligent data storage and signal conditioning circuits. Indeed, they have a massive capacity to store up to 4,000 points of data. They are designed to continuously display the data they retrieve, store the full service history such as data logging, calibration, failure modes and alarm settings, and they run self-diagnostic checks. They are also designed to be simply replaced with pre-calibrated modules whenever required, making maintenance, service and calibration straight forward.


At the Thoresby Colliery, the environmental or eModules used are for detecting CH4, O2 and CO in two ranges from 0 - 50ppm and 0 – 500ppm. The colliery is also using remote or rModules with an output of 0.4 to 2V for remote sensors.


Also installed at Thoresby Colliery is the Trolex Sentrum system, another product which was in development for two years before being launched last year. Unlike other systems before it, the Trolex Sentrum system keeps continuous high accuracy monitoring of methane. It uses complex algorithms to correct the effects of non-methane hydrocarbons cross-sensitivity, together with mass flow calculations. It uses infra-red detection coupled with a unique method to measure the methane content from the sample on a continuous basis. The way this works is that an initial gas analysis is used to ‘train’ the system and subsequent analysis can be used to fine-tune the system. Contributions to the overall signal from the detector caused by methane and other hydrocarbon gases are evaluated and the methane content is derived from the overall signal and the individual contributions from the different gases.


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Gas Monitor Offers Durability and Flexibility for Water Treatment Systems


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Geotech Launches new Portable Biogas Analyser


The new Geotech Biogas 5000 portable biogas analyser arrives in Jan 2012 with a colour-screen and a 3-year warranty. Up-to-the-minute as a new-generation biogas analyser for anaerobic digesters (AD), the Biogas 5000 has mobile phone-style intuitive menus, tactile buttons and it is fast, small and light. With a clear, full-colour, daylight- readable screen in several language choices, the Biogas 5000 is about 25 percent smaller and lighter than the Biogas Check which it supersedes. Advances include greater accuracy to ± 0.5 percent. Within AD biogas, the Biogas 5000


measures methane (CH4), carbon dioxide (CO2), oxygen (O2) and optionally hydrogen sulphide (H2S) at high- or low- ranges. It also measures flow and holds 500 readings against 10 sample points. Analysis response is halved to 10 seconds, saving time and increasing productivity. User-driven improvements include all inlet ports now at the top of the Biogas 5000. It meets UK and international certification standards including ISO 17025, ATEX and IECEx.


At the press of a button, anyone can see context-sensitive operational and user calibration assistance. These technical help screens explain what to do next. Users can pick up a Biogas 5000, select a language and use it with just a brief look at the manual. With the new Biogas 5000, Geotech is responding to growing demand for biogas analysers in many countries which have an increasing focus on renewable energy from biogas produced in AD.


Water purification, the process of removing undesirable chemicals, biological contaminants, suspended solids and gases from contaminated water, is typically done for a specific purpose. Most water is purified for drinking, but may also be done for many other purposes, including medical, pharmacology, chemical and industrial applications.


The addition of a small amount of chlorine or chlorine dioxide helps to preserve water quality during the purification process. Generally the gases monitored during water treatment are Cl2, ClO2, and O3.


Oldham’s (France) CTX 300 is an ideal product for water treatment systems, designed for all safety needs in unclassified areas. The CTX300 is enclosed in a high- grade, explosion-proof plastic housing, with an IP 66 rating (making it resistant to corrosion, and economical to purchase). Its heavy-duty advanced design makes it highly durable in harsh environments. The CTX 300 includes a 4-20 mA output analogue transmitter with optional backlit display as well as plug-in and pre-calibrated sensors. This monitor works with electrochemical, infrared or semi-conductor sensors - an IR version is available to


monitor CO2. Detection The CTX 300 can carry out the detection of O2, CO2, toxic and refrigerant gases and it works with more than 30 different sensors.


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The Biogas 5000 has evolved from earlier models and uses the latest tried and tested technology for in-field biogas analysis. Its development is based on 22-years’ experience by Geotech in design, manufacture and service of portable biogas analysers – and on vitally important feedback from customers and users. That specialist experience combines to deliver dependable reliability and the latest in user-requested operational functionality for anaerobic digester biogas analysis.


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www.envirotech-online.com IET March / April 2012


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