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Gas sensors

Detecting CO, CO2 , NO, NO2 , and SO2

Witec (Germany) has developed gas sensors with CANopen interfaces. The Ultrasens and Infrasens products are able to measure different gas types.

The Ultrasens sensors (Photo: Witec)

The combined gas detection of two or more different gases in a complex gas mixture is important for industrial applications. Based on the selective absorption by gases in the Ultraviolet (UV) and Infrared (IR) spectral range the German company has developed a gas detection system. The brand names for these products are Ultra.sens and Infra.sens. Both gas detection systems are capable to measure different gas types simultaneously in the low ppm (parts per million) range. Typical combinations are SO2 (sulfur dioxide) and NO2 (nitrogen dioxide) for exhaust gas monitoring, SO2 and CO2 (carbon dioxide) for stack gas detection, or CO (carbon oxide) and NO (nitrogen oxide) for engine control. Other gases can be detected, too. This includes chlor dioxide and ozone. The CANopen interface allows to connect multiple gas detection systems to a host controller.

The Infrasens sensors (Photo: Witec)

The Ultrasens implements special LEDs in order to get stable emission of optical radiation. The result is a high-resolution gas analysis system, which can detect gas concentration changes of less than 500 ppb (parts per billion). The entire structure can be disassembled to make the maintenance/service easier. The different devices are sealed with O‐ring joining. Based on this modular design a variety of sample cell length between 5 mm up to 250 mm is possible. The devices can be equipped optionally with coated aluminum and stainless steel sample cells. Witec represented by Ritter also offers the Binos gas analyzer module combing the Ultrasens and Infrasens products.


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