38 Gas Detection One System for Stationary and Mobile Gas Analysis
All plant operators producing energy from biogas, sewer gas or landfill gas aim to optimise processes and thus ensure greater efficiency. At the same time, however, harmful components in the gas need to be kept to a minimum.
Only constant monitoring of the composition of the raw biogas in a plant can indicate changes before it is too late and thereby prevent prolonged outages. For
example, if there is a warning of too much H2S at the measurement location before the motor, the operator can act immediately to protect the motor from expensive damage.
The Multitec BioControl from Hermann Sewerin GmbH (Germany), is a combined measuring instrument comprising the fixed Multitec BioControl and the mobile Multitec 540 gas measuring device and therefore offering users the greatest possible flexibility and ease of use.
Depending on the product version, the gas composition and volume can be automatically measured and monitored live at up to eight measurement locations. The Multitec 540 measures the values at the individual measurement locations sequentially and then transfers them to the Multitec BioControl via an interface.
Individual measurement locations can also be set up for mobile measurement if preferred. The Multitec 540 is removed from the docking station for mobile measurement and the measuring results are stored under the name of the measurement location. When it is replaced in the docking station following the mobile measurement, the stored protocols are automatically transferred to the Multitec BioControl and displayed. Mobile measurements allow you to integrate even remote outdoor measuring points reliably and cost-effectively into the system.
The Multitec BioControl offers a reliable and lasting solution to measuring raw Biogas. ATEX-certified flow rate and temperature transmitters, which can be permanently installed outdoors, are available as optional accessories.
The intelligent compensation of pressure, temperature, moisture and gas composition means that the raw gas volume can be recorded and analysed reliably and accurately. As well as displaying the instantaneous and cumulative flow rates at individual measurement locations, it also shows the associated gas energy.
The Multitec BioControl has a large colour touchscreen displaying a live view of all key measurement values. This together with the clearly laid-out menu structure makes the device very easy and intuitive to use. It is configured to the user's individual requirements, and all settings are password-protected. The device performs continuous self-tests while it is in use.
Enhanced Ammonia (NH3) Sensing using 1512nm Single-Mode Diode Lasers
Eblana Photonics Ltd (Ireland) have announced the release of a Single Wavelength 1512nm Laser Diode for Ammonia detection, using Tunable Diode Laser Absorption Spectroscopy (TDLAS) systems. This laser is available as a high performance “14 pin Butterfly” component (with integrated TEC and isolator) or at a higher level of integration with a built-in low noise current driver and temperature controller in the form of Eblana’s DX1-Sensing module.
The EP1512-DM product series broadens Eblana’s existing portfolio of lasers for gas detection which
already included lasers for detecting Methane (λ=1654nm), Carbon Dioxide (λ=2004nm) and Moisture (λ=1392nm & 1877nm). All of these lasers are now available in the DX1-Sensing format.
The EP1512-DM is fabricated using Eblana’s Discrete Mode (DM) single-line laser technology platform, which delivers DFB-like performance at a price point geared to high volume applications. Eblana’s strained quantum well InP design provides stable, high performance, single wavelength operation and a wide degree of current tuning for wavelength control.
Dr. Rob Lennox, Sales & Marketing Manager at Eblana, says “The 1512nm DM laser was introduced in response to an increasing demand for a cost effective laser for scalable deployment of NH3 detection systems based on TDLAS. Eblana’s lasers provide precise wavelength control and stable performance at a compelling price point for large-scale adoption of laser based gas detection systems. This latter point is our primary focus.”
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The Future of Oxygen Sensing in a Flash
In addition, all relevant components are resistant to aggressive gases. All measurement values and settings are automatically stored on a USB stick at regular intervals to prevent loss of data. The device can also be maintained and diagnosed remotely via the internet.
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The universal FireStingO2 is a compact, PC controlled (USB) fibre-optic oxygen meter with 1, 2, or 4 channels for a broad range of fibre-optic sensors from Pyro Science GmbH (Germany). The oxygen sensors work both in liquids and gases, and are available as full range and trace sensors. Further, the FireStingO2 meter can be easily extended to a multi-channel system, can be combined with a USB-powered temperature extension module for independent temperature compensation of all oxygen sensors and is available as compact one-channel module for OEM applications.
The FireStingO2 meter unites several innovative technological improvements, like the unique REDFLASH technology. This technology offers high precision and reliability with low power consumption and rapid response times, making it the new standard of high precision oxygen sensing.
IET September / October 2013
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