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Gas Detection Flammable Gas Detector Tested by Micropack for Offshore Use
Crowcon’s (UK) innovative new IREX infrared (IR) pellistor-replacement flammable gas detector has been proven suitable for offshore use after undergoing testing by Micropack Engineering Ltd. The device went through rigorous performance testing by the highly respected testing authority based in Aberdeen, Scotland.
IREX is designed to replace pellistor (catalytic bead) type flammable gas detectors, resulting in faster response times and greatly reduced zero drift. Capable of detecting methane, butane, propane and many other hydrocarbons, IREX is specifically designed for applications such as offshore platforms, refineries, gas storage and distribution networks, sewage treatment plants and certain manufacturing processes (such as aerosol production).
Pellistor and some other IR type gas detectors are fitted with sinters (flame arrestors) to achieve Exd flameproof certification. Sinters slow response times significantly and can become blocked by contaminants, a frequently underestimated problem. Because IREX does not use sinters it has an extremely fast T90 response time of less than four seconds – comparable with the most expensive conventional IR gas detectors. Excellent zero stability is also achieved, with none of the drift issue associated with pellistors and cables.
Because IREX operates from the same control systems as pellistor-based detectors, it allows existing pellistor-based systems to be easily upgraded without any of the costs associated with installing a new control system. Sophisticated systems and algorithms ensure reliable operation at all times, with no adjustments necessary to the detector itself. Zero and span adjustments (if required) are performed at the control panel, and gas response tests and calibration can also be done remotely, with test gas simply applied via a tube to the standard weather cover.
Mil-Ram’s New Gas Alarm Instrument for Toxic, Oxygen and LEL Combustible Gas Detection. Hundreds of different gases utilizing several sensor technologies; electrochemical, catalytic, infrared, photo- ionization, solid-state and more.
The Gas Alarm features integrated Strobe and Horn for visual/audible alarm acknowledgement in busy industrial environments.
IREX is designed to provide over 10 years reliable operation, and as there are no sensors which need replacing and because routine testing requirements are minimised, operating costs during its entire lifetime are minimal. The detector produces a mV Wheatstone Bridge type signal (identical to a pellistor) and operates from as little as 2.9Vdc. In addition, it is supplied with a M20 type fixing, allowing originally installed detector junction boxes and cables to be retained. Manufactured from 316 stainless steel; IREX has both ATEX and IECEx approval and is undergoing assessment for IEC61508 SIL 2 compliance.
Reader Reply Card no 26 Infrared and PID Sensors Provide Safety
The Microtector II G460 from GfG (Germany) measures up to 7 gases simultaneously in ambient air for increased workplace safety. The sensor slots can be equipped individually. Different detection principles are available for optimal measuring results.
Mil-Ram Technology, Inc
Tel: 510-656-2001 Fax: 510-656-2004 Email:
sls@mil-ram.com Web:
www.mil-ram.com
For increasing the user’s safety, the Microtector II G460 detects carbon dioxide by means of a selective infrared sensor (NDIR). This sensor provides long- term stable detection values. Unlike electrochemical sensors, IR technology is not subject to cross sensitivity from toxic hydrogen sulphide. The Microtector II G460 is the smallest detector world-wide which can be equipped with both an infrared sensor and a PID.
Reader Reply Card no 27
Photoionisation detector (PID) equipped instruments are increasingly viewed as the best choice for measurement of VOCs at exposure limit concentrations. Familiar substances containing VOCs include solvents, paint thinner and nail polish remover, as well as the vapors associated with fuels such as gasoline, diesel, heating oil, kerosene and jet fuel. The category also includes many specific toxic substances such as benzene, butadiene, hexane, toluene, xylene, and many others. Most VOC vapors are flammable at surprisingly low concentrations. For most VOCs, however, the toxic exposure limit is exceeded long before readings reach a concentration high enough to trigger a combustible range alarm.
The loop data logger records gas concentrations and alarms over a period ofup to 50 hours. This data can be transferred to a PC to be displayed and evaluated. The data logger has a storage capacity of 1800 measuring points per gas. Storing intervals and mode (average, peak, instantaneous values) are programmable individually.
Inaccessible areas, like tanks and containers, can contain lethal gas mixtures. With the G400-MP1 an attachable high-performance pump is available that can sample the gas from up to 100 metres away. The pump and tube is attached easily and has its own power supply does not affect the operational time of the instrument.
A truly independent source of sensor technology and sensor products: • NDIR Gas Sensors for hydrocarbons and carbon dioxide
• State Of The Art OEM 4-20mA Transmitters
• Catalytic Gas Sensors • OEM Gas Sensor Heads • Custom Sensor Design and Development
• Professional Technical Support
Little Braxted Hall, Little Braxted, Witham, Essex, CM8 3EU, U.K.
Tel: +44 (0) 1376 516414, Fax: +44 (0) 1376 516415
Keeping Sludge AD Working
Southern Water has an important routine; every single day it checks the health of its sewage sludge anaerobic digesters on eighteen sites. There, each day Southern Water treats and recycles 1,400 million litres of wastewater from nearly two million house- holds at 373 treatment works from its 21,500-kilometre sewer network. With that huge responsibility this utility company, like any other, needs to ensure the security of its sewage sludge digesters working at their optimum. Central to achieving that is Southern Water’s ‘Best Practice for the Operation of Sludge Digesters’. It produced this document to ensure industry best practice operating routines are carried out at each site. They include daily analysis of pH/alkalinity, volatile fatty acids (VFAs) and biogas composition.
For biogas analysis Southern Water uses fourteen Biogas Check portable biogas analysers from Geotech (UK). They measure methane
(CH4), hydrogen sulphide (H2S), oxygen (02) and carbon dioxide (CO2) – as the balance gas. Southern Water checks each digester is healthy, producing over sixty percent CH4, the minimum for its CHP engines to run and generate electricity. The CHPs have a 1000ppm
maximum for H2S. Above that, H2S may damage CHP engines.
Southern Water selected the simple-to-operate Biogas Check as their field instrument for anaerobic digester biogas gas analysis for which it was designed. ATEX certified for use in potentially explosive atmospheres, the field-proven technology enables consistent collection
of data for improved analysis and accurate reporting. User-configurable operation measures concentrations of CH4, CO2, O2 and H2S. An optional temperature probe measures gas temperatures. All readings are stored including, in-field calibration results. On-board rechargeable batteries last ten hours.
Reader Reply Card no 28 Reader Reply Card no 30 Reader Reply Card no 29
IET
Annual Buyers Guide 2009
Single Channel Gas Alarm Control System
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