Qualvista - Siloxane Measuring System
The patented Qualvista siloxane measuring system is based on the NDIR (Nondispersive Infrared) method. The NDIR method is well-known and the most robust method for measuring absorption of the infrared light of the gas sample provided. The gas flow goes through the equipment at 0.5 l/minute, so continuous measurement is possible. One measurement takes 10 to 40 minutes to complete, depending on the siloxane concentration.
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The system is sensitive and its detection limit is approx. 0.1 mgSi/m3 for total silicon level. The unit can be followed remotely by using state-of-the-art communication technologies. Optionally it can also be coupled to the local automatisation via analog signals and/or communication buses, like Ethernet or ProfiBus. The monitor installation includes a temperature-stablized cabinet for indoor and outdoor use.
The principle of the Qualvista NDIR method.
The modulated IR light source is focused and led through a cuvette. The lense after the cuvette focuses the beam to the gas detector. The information received from the detector enables the Qualvista system to calculate the total amount of silicon using a specific scientific algorithm.
The Qualvista online reporting tool gives the user a comprehensive, customizable view of the biogas measurement information, such as siloxane purification efficiency and current amount of siloxane entering gas engines or turbines. Siloxane information can be reported in any required unit(s), for example mgSi/m3, ppm or ppb. The online reporting information can be accessed anywhere with standard PC and mobile devices. The data can also be downloaded.
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