International Environmental Technology 24.4

Gas Detection 39 New Low Power Version of Best Selling Miniature Infrared Gas Sensor

A new Low Power ‘Platinum’ version of a best selling miniature Infrared Gas Sensor series has been announced by Dynament (UK). The new sensors consume only 15 milliamps at 3 volts dc which represents an approximate reduction of 80% compared with the company’s ‘Premier’ sensors. They are designed for use in solar, wireless and battery powered applications and will detect a wide range of Hydrocarbon gases such as Methane, Propane, Butane, etc and Carbon Dioxide.

The sensors are compatible with the company’s existing ‘Premier’ series with all sensor varaints available in the new low power format. They also utilise the same technology which has proven itself over the past 10 years with over 500,000 in use worldwide in 40 countries in a wide variety of industries and applications including mining.

The sensors can be supplied either in either ‘Ex’ certifi ed form (including Mining) for direct use in Original Equipment Manufacturer’s gas detection equipment or in ‘Non-Ex’ form for use in either non-hazardous area applications or in hazardous area certifi ed equipment where the gas detector manufacturer provides the ‘Ex’ protection. Single-Gas versions are available for detection of either Hydrocarbons (e.g. Methane, Propane, Butane etc) or Carbon Dioxide.

The company also offers a Dual-Gas version for the simultaneous measurement of Hydrocarbons / Carbon Dioxide within a single package. Both versions can

accurately detect gas levels over the range of 0 to 100% volume. The sensors can be pre-confi gured for specifi c measurement ranges according to customer requirements. Methane versions feature auto- ranging in order to provide high resolution for Lower Explosive Level (LEL) measurement.

An additional option is for EN 50271 / SIL 1 SIRA certifi ed versions.

The standard operating temperature range for the sensors is -20 to +50 degrees C. Every individual sensor undergoes full temperature compensation over this range for Methane, Propane and Carbon Dioxide gases with the characteristics stored within the sensor electronics. Extended temperature versions of the ‘Non-Ex’ form only are available to special order covering either -40 to +50 degrees C (‘XT’ type) or -40 to +75 degrees C (‘XTR’ type).

Advanced Remote Networking for Gas Detection

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The Sentinel SiteWatch connects Detcon wired or wireless gas and fl ame detection systems to your smartphone, tablet, laptop or desktop computer and provides email messaging with date and time stamps for all alarm and fault conditions that occur. The Ethernet version includes a webpage that can be accessed from anywhere in the world and allows real-time viewing of detector type, serial number, location/name, gas concentration, gas type, alarm and fault status, along with battery life and communication link quality for wireless systems.

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Strong SSL/TLS-based encryption is used to provide communication security over the Internet. The Sentinel SiteWatch connects to Detcon Controllers X40, MCX-32, and Site Sentinel SmartWireless CXT, through RS-485.

Portable Gas Detector Puts an End to Costly, Time-Consuming Leak Surveys Detection of gas leakage with the

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fl ame ionisation and semiconductor technologies used to date is time- consuming and cost-intensive. They require close approach to the leak location, which can be risky for leaks far above ground level or in hazardous areas. Esders GmbH (Germany) has now developed a solution to this problem: a laser detector which senses gas leakage, even in diffi cult-to-access locations, at distances up to 30 m. ELLI (Esders Laser Leak Indicator) is a portable gas monitor which is used to locate leaks from gas supply stations, biogas or industrial plants and gas lines, even those situated well above ground level. The detector senses methane concentrations even through double-pane windows in buildings.

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“In biogas fermenters for instance, the seals around agitator shafts are often not completely airtight.” explains Sebastian Wilkens, Product Manager at Esders GmbH. “The biogas emitted is typically over 50 % methane, which ELLI detects selectively”. Gas leaks can be encountered in other systems as well including industrial plants, gate stations, compressor stations, gas storage facilities, etc. Leak surveying procedures used to date require close-up scanning with hand-held probes over the entire gas-carrying system. Problems are posed by areas which are inaccessible, hard to reach or located in hazard zones requiring use of personal protective equipment. In contrast, the TDLAS (Tunable Diode Laser Absorption Spectroscopy) remote sensor technology incorporated in ELLI reliably detects methane at safe distances up to 30 m. Detection at greater distances is possible as well under favourable refl ective conditions.

“Simply point the laser beam at the area you want to check.” explains Wilkens. The ELLI detector, compactly sized with dimensions of 213 x 155 x 66 mm, measures methane concentration by determining the difference in intensity of the infrared laser beam when emitted and when refl ected back. The measurement takes place at a specifi c wavelength to ensure selective detection of methane. The reading is displayed in units of ppm · m, i.e. the product of the methane concentration between the detector and the target and the path through the gas plume. ELLI senses methane over a detection range from 0 to 50,000 ppm · m.

The results of the detector check, which can be carried out at ambient temperatures ranging from -17 °C to + 50 °C, are shown with a lag time of only 0.2 seconds on a colour LCD touch panel display. The monitor indicates even the smallest methane accumulations or leakage in virtually real-time operation. Hazardous readings are accompanied by an audible warning alarm with user-defi nable settings.

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Detcon (USA), an IST company, is pleased to introduce the Sentinel SiteWatch, an advanced networking device that provides safety-critical information of gas and fl ame detection systems through Ethernet or cellular communications.

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1911ad@reply-direct.com www.envirotech-online.com IET Annual Buyers’ Guide 2014/15

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