odalogodalog sewer   The OdaLog® is a portable gas detector specifically designed for the wastewater industry, manufactured by App-Tek International – the industry-proven gas detection specialist for harsh environments.

   Due to the nature of the environment in which the instrument has to operate, the OdaLog® is designed to be intrinsically safe, corrosion-resistant, robust and able to log data for extended periods of time. The OdaLog® is primarily used at a location close to the source of Hydrogen Sulphide (H2S) emissions such as those found within sewerage pumping stations, receiving manholes and inside sewer collection lines. Also, it can be used as personal safety device for confined spaces (OdaLog® 7000 MkII).

key issues for selecting o-sensors   In this paper, an innovative device to measure odour emission known as Electronic Nose (ENs) is presented. These devices allows a continuous monitoring in situ of odour emisions and are able to detect quick changes in the emission rate of odours avoiding a time-consuming use of a laboratory. In this article, the author comments the application of different sensors for a each particular case and compare in the use of an EN in different activities. In addition, a short introduction about the different e-noses available in the market is presented.

   Keywords: Odour; Pollution; Sensors; Olfactometry; Statistical Software.

odorant sensors

   Recent developments in the technology of odours have carried out the emergence of new devices mainly for odour monitoring. These systems were previously known as electronic noses or "e-noses", however this term in incorrect because these devices do not have a sense of smell, which is a human thing. A more correct term would be odorant sensor or o-sensor. In some cases the term "o-sensor" would be maybe too restrictive as it would exclude some other instruments for odour monitoring such as Gas Chromatograps for example.

   The primary application of these instruments is to generate odour metrics that are relevant indicators for the presence and attributes of odour as would be perceived by human observers.

   A benefit of instrumental odour monitoring systems is that they can be used for continuous measurement.

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