Air Monitoring 35


New, sub-miniature, low- cost, high sensitivity and fast-response detector with built-in preamplifi er provides the ideal choice for industrial gas analysis applications


Hamamatsu has developed a new InAsSb photovoltaic detector (P16702-011MN) with built-in preamplifi er offering high sensitivity to mid-infrared light, up to 11 micrometers (μm) in wavelength. Hamamatsu achieved this by combining the latest InAsSb (indium arsenide antimonide) mid-infrared detector with their unique circuit design technology. Compared to Hamamatsu’s previous detector modules with same level of sensitivity, the P16702-011MN size and cost is drastically reduced, and it exhibits fast response time. This makes it an ideal choice for portable gas analysers able to immediately analyse exhaust gas components at measurement sites around factories.


The P16702-011MN is a compound semiconductor photodetector with built-in preamplifi er for electrical signal amplifi cation.


Each molecule has its own vibration and absorbs infrared light at a specifi c wavelength determined by its energy. This property can be used to analyse and identify the type and quantity of chemical components contained in a sample. Therefore, mid-infrared light is widely utilised in the analysis of nitrogen oxides and sulphur oxides contained in exhaust gases from factories, etc.


To meet needs in applications such as gas analysis and monitoring of processing laser equipment, Hamamatsu develop and sell InAsSb mid-infrared detectors and detector module products with enhanced sensitivity, by integrating these with electronic circuits and components including preamplifi ers. To keep up with the growing market demand of further downsizing equipment, Hamamatsu have been working on a sub-miniature, low-cost mid-infrared detector device that also offers high-speed response.


In designing this new device, Hamamatsu adopted the latest back-illuminated type InAsSb mid-infrared detector with a sensitivity 1.5 times higher than the regular type. Hamamatsu encapsulated it into a small cylindrical package with a diameter of approximately 9 mm. The device was drastically downsized to about 1/200th the volume of Hamamatsu’s module products, yet it still offers the same level of sensitivity capable of detecting mid-infrared light at wavelengths up to 11 μm. What’s more, the wiring in the package is optimised to increase the response speed up to 100 megahertz, which is twice as high as Hamamatsu’s module products, thus improving measurement accuracy. It also has a lower manufacturing cost since the number of required components was reduced.


The P16702-011MN will speed up the replacement of mercury-cadmium-telluride (MCT) infrared detectors which is currently the mainstream in high-precision mid-infrared spectroscopy but contains toxic substances restricted by the RoHS Directive (*1). Hamamatsu Photonics is one of the few companies in the world that manufacture both photodetectors and light sources. Using the P16702-011MN in conjunction with a quantum cascade laser or QCL (*2), which they also manufacture, allows making measurements at even higher speeds, resolution, and sensitivity.


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59648pr@reply-direct.com New multi-gas analyser off ers rapid and precise measurements


in continuous or mobile onsite applications The new MFA 10.0 from WITT is an extremely versatile multi-gas analyser that can determine the composition of 15 different gas mixtures - precisely and quickly. This makes the compact and lightweight device ideal for visiting on-site and continuous analysis.


The MFA 10.0 analyses various two-gas mixtures of argon, helium, carbon dioxide, methane, oxygen, nitrogen and hydrogen. The reading is carried out in a matter of seconds, applying the thermal conductivity measurement principle. This technology ensures a longer service life for the measurement cell. The new WITT analyser is particularly user-friendly. It is operated via a 7” touch screen with password protection. Gas combinations can be selected and alarm limits defi ned quite intuitively. If the limits are exceeded, an acoustic and/or visual alarm is triggered, and (where specifi ed) an alarm acknowledgement requirement. All measurements can be viewed and exported via the measurement history function.


Unlike other devices on the market, the MFA 10.0 does not have to be recalibrated when the gas combination is changed. This simplifi es handling and saves valuable working time.Thanks to its compact dimensions, low weight and integrated handle, the new MFA 10.0 with its robust stainless- steel housing can be used as a mobile unit. However, it is also suitable as a stationary unit for continuous monitoring of gas mixtures. An RJ45 network connection, an analogue output and three potential-free relay contacts are available for signal transmission. The input pressure may be in the range of 1.5 to 10 barg, the temperature range in the range of -5°C to 50°C. 100 - 230V are required for operation.


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Reliable, precise and cost- eff ective industrial emission monitoring system undergoes upgrade


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The MRU GmbH is a family-owned company based in Germany, specializing in the production of high-quality and durable portable and stationary industrial emissions monitoring systems. MRU has technologically revamped its long-standing SWG 300 IND (indoor) gas analysis system. We can now offer our customers an advanced multi- component gas analysis system for indoor applications. Using NDIR modules, the SWG 300 IND ensures continuous, precise, and selective measurement in the ppm range, even under the most challenging industrial conditions. Upon request, the system is available as SWG 300 OTD (outdoor) for outdoor use or as SWG 300 EX for hazardous areas (ATEX Zone 2 compliant).


The SWG 300 IND operates with optimized and precise NDIR technology, providing multiple options for infrared measurement modules, including 6-gas or 8-gas confi gurations. When using the 8-gas infrared module (NDIR), it can measure CO, CO2, NO, NO2, N2O, SO2, CH4, and HC. The O2 measurement can be performed using either an electrochemical or paramagnetic sensor. The emission monitoring system features a multi-stage Peltier gas cooler with two automatic condensate pumps for cold/ dry gas extraction, as well as automatic zero-point and calibration functions. Extended fi lter lifetimes result from the low sample fl ow volume of only 1 l/min.


The SWG 300 IND offers accurate, direct, and continuous measurements, even under variable pressure and temperature conditions. It features a 3.5-inch TFT color display, a keypad, and a standard RS485 interface (Modbus RTU). MRU provides a variety of probes tailored to the specifi c requirements of gas analysis, including options for low-dust and high-dust environments, as well as compact probes with heated gas sampling lines. The system supports heated gas sampling lines up to 70 meters for up to two measurement points.


The SWG 300 IND is designed for easy access to facilitate maintenance and operation. It includes a gas conditioning system with a heated acid separator, 8 analog and RS485 Modbus outputs, PC data and visualization software, as well as internal fl ow monitoring and alarms.


These versatile and reliable MRU measuring devices play a crucial role in emissions monitoring and reduction, enabling companies that use them to demonstrate a strong commitment to reducing air pollution. The SWG 300 series offers the ideal combination of cost-effectiveness, reliability, and precision, making it suitable for a variety of applications such as aluminum processing, breweries, biogas and biomass boilers, blast furnaces, cement industry, diesel generators, continuous emissions monitoring, CH4, CO, and CO2 measurements, gas turbines, compressors, iron foundries, steel industry, kilns, landfi ll gas analysis, power plants, refi neries, and petrochemicals.


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