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Gas Detection Biogas Analyser: Multi-Point Sampling
and High & Low-Range H2S The latest Geotech (UK) fixed biogas analyser is the user-installed GA3000 PLUS. It can now
optionally monitor up to three sample points and hydrogen sulphide (H2S) ranges of 0- 50ppm and 0-10,000ppm. The new developments enhance the widely used ATEX Zone 2
certified GA3000 which analyses methane (CH4) carbon dioxide (CO2) and oxygen (O2) in landfill gas and AD biogas.
With three sample points, AD operators can measure gas quality from more than one digester to check output from each. Tracking production at source can help improve output and spot problems early.
Landfill operators can measure different gas field sections before the gas is mixed. All operators can check mixed gas before it goes to the CHP engine. By measuring the mixed gas going to CHP and to flare, operators can control both.
With multi-point sampling, operators achieve more analysis from one fixed analyser giving even better value. A 4-20mA output for each gas is standard as is MODBUS digital output, allowing communication with SCADA systems. Alarm relays are user configurable.
The GA3000 PLUS offers the advantage of high- and low- range H2S measurement in the same system but from different sample points usually for biogas monitoring before and after desulphurisation. For AD and landfill operators, H2S measurement pre- and post-treatment shows the effectiveness of H2S removal and maintaining H2S below acceptable CHP thresholds and compliance with CHP manufacturer warranty contracts. Vital for CHP restart and protection against sudden gas level changes, the GA3000 PLUS fixed biogas analyser can pay back in weeks or even days.
Reader Reply Card No. Sensors for Mining
City Technology’s (UK) gas sensors are the heart of personal and fixed gas detectors, protecting lives and facilities in inhospitable environments and dangerous industries such as mining. The industry has grown rapidly during the last five years in China, SE Asia, Africa and Latin America to meet the increasing demand for minerals as these economies develop. With individuals’ lives potentially at risk, reliability is critical, so all our sensors are tested under extreme conditions to ensure that they will function flawlessly throughout their design life.
City’s sensors are approved to the demanding specifications issued by the mining industries in emerging regions as well as more established markets of North America and Europe. The challenges vary widely: in deep coal, precious metal and rare earth mines, extreme temperature changes, rapid humidity variations and significant pressure changes are experienced as miners travel down from the surface. In South African mines, hydrogen cross-sensitivity is a major issue; in both deep and open cast coal mines methane gas is an ever-present hazard.
John Warburton, City Technology strategic marketing manager, said, “Our products are designed to meet the most stringent global requirements. We have a strong, field-proven portfolio and our most recent developments have been specifically designed for mining applications. 4OXV, our latest oxygen sensor, is highly stable under rapid pressure change, and our new carbon monoxide sensor, 4CM, offers the fastest response and recovery times in the industry. Our robust Pellistors are poison-resistant and offer outstanding shock and vibration immunity, a critical requirement for the mining industry. We are the approved sensor supplier for the majority of instrument manufacturers who serve these markets. As our sensors are trusted to protect people’s lives in these industries, we are confident that they will perform reliably and faultlessly in all other applications.”
Reader Reply Card No. 70 69 Wireless Gas
Detection Sensors - Ideal for Mobile Applications
Detcon’s (USA) rugged new CXT- Series wireless gas detection sensors are designed for use in heavy industrial environments and especially suitable for mobile applications. These “environmentally bulletproof” field devices include fully encapsulated sensor electronics housed in a stainless steel enclosure, thereby eliminating potential damage that may be caused from water ingress. The CXT is equipped with one of two sensor technologies - electrochemical to monitor toxic gases, and infra-red for combustible hydrocarbons. Power is supplied by a rechargeable Smart Battery Pack or disposable battery options. When powered by the Smart Battery Pack, infra-red sensors can work continuously for more than six months, and indefinitely with accompanying solar panels.
While all CXT-Series gas detectors use an innovative “Self-Healing Mesh Network” topology, the CXT-300 is equipped with the most advanced innovation in network safety. Designed with Detcon’s patent pending “Fault Tolerant Safety Network” technology, the CXT-300’s processing power is shared among all network devices, allowing any device in the network to take over as “master” should the designated master device fail. Consequently, the CXT-300 does not depend on a single controller to maintain network operation and ensure safety. Detcon’s patent pending “Fault Tolerant Safety Network” guarantees no single point of failure.
Reader Reply Card No. Take a look at our website
www.envirotech-online.com New Guide to Gas Detection Published
A new independent Guide to Gas Detection has been published by CoGDEM (The Council of Gas Detection and Environmental Monitoring) to provide industry professionals with a complete reference document on the accurate, reliable measurement of gas concentrations in both process control and occupational safety applications.
This book provides the latest information on UK, EU and global regulations, guidance on flammable, toxic and asphyxiant gases, workplace safety, gas detection requirements, sensor technologies, calibration and performance evaluation.
“There is an emphasis on providing practical guidance throughout this book. For example, a quick reference guide explains the key issues in gas detection system selection, this book will be essential reading for anyone with a professional interest in gas detection.”
To order this book please log onto
http://www.ilmpublications.com or email
info@ilmpublications.com
The new version of the smartMODUL-FLOW from smartGAS Mikrosensorik GmbH (Germany) is able
to detect remains of sulphuryl fluoride (SO2F2) in small concentrations. Sulphuryl fluoride is used as a pesticide in containers, which are loaded with wood or goods stored in wooden boxes. Fumigation of the containers with the pesticide avoids reproduction of insects, which could destroy or damage the goods during transport.
The use of SO2F2 as a fumigant increased since the 1980's, when it replaced methyl bromide, which
damages the ozone layer. The new sensors are ideally suited for the detection of the toxic gas in a range from 0 to 100 ppm. The sensor utilises infrared (NDIR) absorption and has various advantages compared with other types of sensors. By using highly selective IR absorption technology and integrated optical gas filters cross sensitivities with other gases are reduced to an absolute minimum.
This book is available in Hard Copy at
www.ilmpublications.com Reader Reply Card No. IET November / December 2012
www.envirotech-online.com 73
Due to the dual-beam-technique the sensor shows practically no ageing or long term drift. The sensor is available with many standard interfaces like Modbus ASCII with RS485, UART or 4…20 mA enabling an easy integration into existing control architectures.
Reader Reply Card No. 72
Detection of the Pesticide
Sulphuryl Fluoride 71
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