12 Gas Detection Portable, precise and dependable leak-tightness testing system for hydrogen fuel cells


It is widely anticipated that hydrogen, used as an energy carrier, will play a signifi cant role in the energy transition which will reduce our use of fossil fuels. For example, it can store excess renewable energy generated by solar panels or wind turbines. Electric batteries produce waste and lose storage capacity over time; hydrogen tanks, on the other hand, are much better suited for storing large amounts of energy, while producing zero waste.


Hydrogen, stored in these tanks, can be converted back into electricity via a fuel cell system. Electricity, heat and water are produced when hydrogen bonds with oxygen in the air, all without creating any carbon dioxide emissions. The converted electricity can then be utilised as a power source for a wide range of applications, from stationary and industrial equipment to mobile appliances. Fuel cell systems are now a major part of the energy chain and they will only grow in importance over the coming years. Hydrogen is Earth’s smallest molecule; it permeates almost anything and is highly fl ammable when in contact with air. It is therefore crucial to prevent hydrogen tanks from leaking and to discover any such leaks as early as possible.


H2PULSE recently developed a high-precision, portable leak detection system for fuel cell systems. This system works on a simple principle; the fuel cell being tested is attached to the leak detection system via a standard plug-in connector. Hydrogen fuel cells have three channels: one for air/oxygen, one for hydrogen and a cooling channel. Each channel is connected individually to the H2PULSE system.


When the fuel cell is not operational, a gas fl ow is connected to the fl uidic chain that feeds the three channels. The tests are performed independently of one another, fi rst using nitrogen, and then hydrogen, to detect any leaks in the system. The cooling channel’s sole purpose is to cool the fuel cells, which heat up during operation.


KELLER’s 33X and 21Y pressure sensors measure pressure at the fuel cell inlet and outlet. The measurements are recorded on a regular basis throughout the process and are displayed on-screen in real-time, to enable and ensure continuous monitoring. A reduction in pressure would indicate that there is a leak in one of the three fl ow channels. The high level of precision of KELLER’s pressure transmitters enables operators to detect leakages in the smallest non-leak-tight areas, thus ensuring that fuel cells remain safe to use.


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Detecting natural gas and hydrogen in One instrument email:


Teledyne Gas & Flame Detection is releasing an enhanced version of the popular Gasurveyor 700 (GS700), known as the GS700-Hydrogen. This upgraded model incorporates the capability to detect hydrogen (H2


single instrument enhances versatility and performance across various gas utility applications. Notably, extensive testing and collaboration with major UK gas utility companies played a crucial role in the development of this new instrument.


Whether it’s natural gas, pure hydrogen (100% H2 barholing and pipeline gas testing. Providing safety and peace of mind, the fully ATEX-certifi ed instrument enables utilities to quickly determine the source of gas leaks.


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In Scotland, SGN’s H100 Fife project will establish the world’s fi rst green hydrogen gas network in Levenmouth, Fife. This pipeline, entirely dedicated to 100% hydrogen, will run parallel to the existing natural gas distribution pipeline, providing customers with a choice between the two gases. SGN collaborated with Teledyne Gas Measurement Instruments, a Teledyne GFD brand, to develop the GS700- Hydrogen. This collaborative process ensured the instrument’s suitability for emergency response and engineering teams, enabling them to precisely detect and locate both H2


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and natural gas leaks. The collaboration resulted in refi ning the instrument’s operation and validating its technology.


Teledyne GMI subsequently partnered with Northern Gas Networks as part of the UK’s ‘H21’ hydrogen homes project. Northern Gas Networks adopted the GS700-Hydrogen to ensure safety within their H21 networks and measure hydrogen during activities like purging and pipeline commissioning.


The successful outcome of this collaborative development approach, under real-world operating conditions, led to the inclusion of many added-value features. These include user-friendly display options that provide comprehensive gas readings at users’ fi ngertips. The instrument displays LEL, PPM and volume gas readings, with 360° alarms ensuring operator safety. Users can effortlessly view either the total fl ammable reading or the individual LEL readings (natural gas or hydrogen) at the touch of a button. The user interface is fully confi gurable, allowing customisation to the specifi c requirements and preferences of gas utilities.


Dedicated application modes, such as gas leak outdoors, purging, barholing and search operations, offer inherent fl exibility. Each mode delivers fast and accurate measurements, aiding in swiftly pinpointing gas leaks and ensuring utilities are best equipped to protect people and safeguard property. Additionally, the GS700 incorporates compliance features through intelligent data-logging and optional GPS mapping. These functionalities simplify data collection and empower managers to make informed decisions based on data driven reports.


With the new GS700-Hydrogen from Teledyne Gas and Flame Detection, any gas utility involved in hydrogen transitioning can now leverage the benefi ts of both H2


performance and highly fl exible all-in-one instrument. More information online: ilmt.co/PL/Ve2y


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and natural gas detection using a high- 61138pr@reply-direct.com


Extended temperature range available for range of highly precise and


reliable gas sensors LogiDataTech GmbH’s MF420-P product range has been using a catalytic sensor (pellistor) to determine the concentration of explosive gases and vapours reliably and accurately in an air mixture for many years. In addition, they can also monitor for hydrogen, methane or LPG, as well as gases from the alcohol family such as methanol, ethanol, propane.


The measuring range of the gases is 0 to 100% LEL. The concentration is output via a 4 to 20 mA interface for further processing. In addition to the previously available temperature range of -10° to +50°C, a temperature range of -30°C - +60°C is now also available. The system is delivered in a robust aluminium housing with IP54 certifi ed protection, which can also be used in dusty or dirty environments.


In combination with LogiDataTech’s limit value detectors (GWZ), reliable gas detection systems for detecting explosive gases and vapours in the ambient air can be set up at low cost. Typical applications for the system are storage rooms with explosive gases and vapours, refrigeration systems or process monitoring.


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The development of the lightweight (1.4kg) yet durable GS700-Hydrogen was supported by comprehensive fi eld trials aligned with the hydrogen transition efforts of prominent UK utility companies: SGN and Northern Gas Networks.


), or hydrogen blends, the portable GS700-Hydrogen simplifi es gas detection across applications like outdoor and indoor leak detection, purging, ), in addition to its existing ability to detect natural gas (NG). This integration of natural gas and H2 detection within a 61125pr@reply-direct.com


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