22 Gas Detection


Detecting unseen gas dangers before it’s too late


First laser open path H2 S gas detector for safety related applications


Teledyne Gas and Flame Detection is unveiling its GD1 laser-based gas detector with full SIL2 approval. This ground-breaking development means that the GD1 SIL2 is the market’s fi rst open-path gas detector for hydrogen sulphide (H2S) safety-related applications.


The global importance of SIL (Safety Integrity Level) has grown substantially in the oil, gas, petrochemical and other process industries over the past 10 years. It makes sense, therefore, that devices such as gas detectors demonstrate their suitability and competence in line with the latest SIL2 third- party certifi cation.


The GD1 from Teledyne GFD fi rst entered the market in 2011, with well over 800 units since deployed at oil and gas exploration and production companies throughout the Middle East and the rest of the world. With its new accreditation, the GD1 is now suitable for use in systems with SIL2 requirements. To provide some context, a typical SIL1 ATEX-certifi ed gas detection device/system will come complete with the functional approval according to IEC 60079-29-3 and require regular maintenance. The step from SIL1 to SIL2 requiresthe self- testing of hardware components, reduced maintenance intervals for sensors, strict requirements during development and thoroughly documented software.


Unknown dangers await us in many working environments. This is especially true for gases whose presence is often not detected until it’s already too late. But there are various different measures you can take to be prepared as well as possible and thus increase personal safety.


Toxic and combustible gases as well as divergences in the oxygen levels (both too low and too high) pose dangers to people. Precisely assessing the situation for dangers is therefore crucial and should be done before each work assignment. This is, of course, especially important in situations you are anticipating dangers from gases to arise, such as fi refi ghting operations, maintenance personnel entering a sewer or entering hazardous material storage. If you know in advance that a certain gas will pose a direct risk, monitoring for this specifi c gas or danger, such as lack of oxygen, can be suffi cient. However, in most cases, it is more complicated than that.


A person wearing a portable multi-gas detector correctly (i.e. in the area of the air the wearer is breathing in) can increase their own safety and that of the people around them while also being able to concentrate on the task at hand. GfG’s Polytector III G999 is available with sensor confi gurations for monitoring up to eight different gases. This will facilitate the 0prevention of several risks, stemming from different toxic and combustible gases as well as lack of oxygen, at once with only one gas detection device. Portable gas detectors need to be “bump tested” before the start of each shift to guarantee that all monitored gases will be detected in time. This can be done with automated docking stations, e.g. the DS404 with four gas inlets.


If you need to enter confi ned spaces or containers for your operational processes, they must be analysed before and after entering, as part of risk prevention measures. The G999 with its integrated powerful pump is well suited for this task and will detect any present dangers when


it matters: before you enter the dangerous area. It is of course also the responsible choice to wear a multi-gas detector for work in confi ned spaces. The compact Microtector III G888 offers the complete functionality of a fully equipped 7-gas detector, without impeding its wearer’s freedom of movement by its size or weight. Even if the air in a potentially dangerous area has been analysed before entering, the situation can change at any moment. The high bandwidth detectors can monitor multiple dangerous gases and the oxygen concentration, ensuring that they will sound an alarm before a dangerous situation can arise.


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IET MARCH / APRIL 2023


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Teledyne GFD’s innovative GD1 will prove attractive in SIL2 applications for a number of reasons, not least its unique, tunable laser diode that eliminates any environmental effects from sun, rain or fog. In fact, the GD1 can operate with up to 98% obscuration, boosting overall site safety. This capability is possible because light emitted by the detector travels as a cone from one point to another, rather than as a conventional straight beam. In other words, the beam expands after transmission and is almost a metre in diameter when it reaches the receiver. It can therefore penetrate harsh environments that competitor solutions may fi nd diffi cult.


With its fast and fail-safe laser, the GD1 performs real-time automatic calibration and automatic proof testing, eliminating the need for manual intervention and reducing maintenance costs. Further advantages include low power consumption, very long lifespan and a high sampling/detection rate of 8000 times per second thanks to its ultra-stable optomechanical design and construction. Furthermore, there is no potential of cross interference; the laser scans single absorption lines where there is no interference from other gases.


All of these added-value characteristics mean the GD1 can replace multiple standard detectors to cover the same risk, making it an economic solution that typically demonstrates real cost savings within two years.


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Thermal and optical camera system for monitoring hazardous areas


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SeSys’s ATEX and IECEx compliant digital cameras are designed to facilitate remote monitoring in inhospitable, hazardous or explosive areas.


Also known as explosion proof cameras, SeSys cameras reduce the dangers posed to personnel - live video images are accessed via a web browser, allowing users to monitor areas and processes from a safe distance with both optical and/or thermal imaging available. Cameras are connected using PoE (Power over Ethernet), through a single cable installation that is fl exible, reliable and safe.


One of the key benefi ts of ATEX-approved cameras is their ability to provide real-time monitoring of high-risk areas, such as refi neries, offshore platforms, and drilling rigs. This allows operators to quickly identify and respond to potential safety hazards, such as leaks or equipment failures, before they become major issues.


The use of ATEX-approved cameras is also in line with the industry’s growing focus on sustainability and reducing


emissions. By providing more accurate monitoring of operations, these cameras can help companies reduce their environmental impact and meet regulatory requirements.


These devices provide superior image quality; they are now even more light sensitive and have greater resolution sensors offering 6 megapixel low-light technology, which are up to 30 x larger than conventional CCTV images, the full image is recorded even if the live image has zoom applied. If the footage is later required to be used then the full image can be reviewed using the post processing software, which enables any part of the image to have zoom applied.


Camera images can be accessed at a safe distance from a control room or, with enabling hardware, from any location via a web browser, over wireless (wi-fi ) or mobile networks, including Alarm Receiving Centres (ARCs). SeSy’s cameras integrate with many of the industry’s leading ARC software including Genetec, Milestone and Sentinel.


The cameras also feature integrated recording and image storage of up-to 1TB. Recording can be continuous, or event driven e.g. via activity sensor, motion and sound, which saves on storage. The intuitive user interface makes it easy to search and retrieve recorded events with no requirement to purchase additional video management software.


Alarm/event activation is performed via e-mail alarms, complete with images, thus alerting users to events without the need for constant monitoring. The ATEX camera integrates with most management applications and event triggers can include motion detection, loitering and temperature thresholds (up to 20 in one image).


Low power consumption makes the cameras safe and suitable to be used in locations where there is limited power, and contributes to rapid return on investment. Also interfaces with solar/ wind power and fuel cells.


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