16 Air Monitoring
Oxygen Measuring Device for Flue and Process Gases
The oxygen measuring device OMD 14, from Dr. Födisch Umweltmesstechnik AG (Germany), is used for the measurement of the oxygen concentration in flue gases and process gases. Thereby the concentration of the free oxygen is measured.
The oxygen measuring device OMD 14 consists of an in-situ probe and a probe head. The probe is equipped with a regulated sensor heating and electronics for operating and visualisation. The evaluation electronics and the measuring value display are located in the probe head. The centrepiece of the device is a potentiometric zirconium dioxide sensor.
The measuring gas diffuses through the measuring cell of the probe rod. Thereby the oxygen concentration is detected. Thanks to the electronics the analogue sensor signal is converted and is provided on transfer clamps as an mA signal.
The oxygen measurement is carried out by means of a zirconium dioxide cell. Inside the cell the measuring gas is separated from the reference gas (ambient air) via a zirconium membrane. Depending on the oxygen partial pressure the oxygen ions move through the membrane. This results in an electric potential difference.
The used oxygen sensor consists of a measuring cell and a pump cell which provides a constant oxygen concentration in the measuring cell. The thereby spent energy is a degree for the oxygen concentration.
Due to the proven proportionality of the signal to the concentration a steady exactness in all oxygen concentration ranges is ensured.
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Gas Analysis Workshop Focuses on FTIR Versatility
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Gasmet Technologies (Finland), the manufacturer of FTIR gas analysers, organised a meeting in Lisbon, immediately prior to the CEM 2016 conference and exhibition in May, to provide delegates with an insight into the wide variety of applications for which FTIR technology is employed.
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The measurement of greenhouse gases (GHGs) was a particular focus for the event, with presentations from a number of speakers outlining the advantages of simultaneous
RAW GAS • FLUE GAS • PROCESS
multigas analysis with Gasmet’s fixed and portable FTIR analysers. Dr Joseph Storlien from Saint John’s University, Minnesota USA, described his work with portable Gasmet FTIR analysers in the measurement of soil flux GHGs. He explained how robust field-use instruments such as the DX4040 enable faster, easier collection of monitoring data; delivering more data points than the more costly and time-consuming methods that rely on laboratory analysis.
Dr Storlien summarises his presentation in a short video that can be viewed on the Gasmet YouTube channel. This webpage also features a video demonstrating how to employ portable FTIR for soil gas analysis.
Prior to the Lisbon meeting, Gasmet received notification that its CEMS II e continuous emissions monitoring system had successfully completed EN 15267-3 testing for the analysis of low range Hydrogen Fluoride, low range Nitrous Oxide, Methane and Formaldehyde. “This means that it meets the performance specifications in European directives and also the more stringent specifications in the type approval standard EN 15267-3 for a larger number of components than any other FTIR in this market,” commented Gasmet’s Antti Heikkilä. A brief video explaining the importance of this certification also features on the Gasmet YouTube channel.
The newly certified emissions analyser was the highlight of Gasmet’s booth at CEM 2016, the industrial emissions monitoring conference that also took place in Lisbon. “Focusing as it does on continuous emission monitoring, CEM 2016 could not have been better timed,” says Heikkilä. “The Conference was attended by international delegates from key sectors such as Power Generation and Waste Incineration, so there was enormous interest in the new performance data for our FTIR analysers.”
Gas Monitoring in Tough Areas
Emissions monitoring can be a challenge due to corrosive gases, high dust load, and high temperatures.
Based on a non-contact method, OPSIS provides an accurate analyser that will operate with a minimum of maintenance.
The OPSIS cross-stack system has been tested and approved for the best performance and longest calibration intervals.
Read more about our gas monitoring solutions on our website
opsis.se.
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Scan the QR code to watch our videos on OPSIS Play, or go directly to
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OPSIS AB
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For the First Time in Sodar History... ... a wind energy certification campaign has started with
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absolutely no post filtering of the data. Moreover, there has even been no preliminary intercomparison period before the official start of the experiment. Remtech (France) brought one PA0 Sodar (belonging to a customer and a few years old) onto the WindGuard test site and simply started it. WindGuard specialists have retrieved the Sodar data and made the statistical intercomparison analysis with their tower data to which Remtech has never had access.
The fact that our instrument is capable of outputting only good data (never any outlier) is fundamental. You can trust the data, and you do not have to spend a lot of time and money trying to “filter” the data after the fact with no assurance regarding the final result. The recovery rate is very high.
This is achieved thanks to: Multiple frequency coded transmission, noise subtraction in the Fourier domain, the “apparent” angle of arrival signal processing, and phase gradient versus frequency.
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