Multigas sensors

Automatic baking control by introduction of intelligent multigas sensors (artificial noses). 

Automated baking Multigas sensor, electronic Non MST, Infrared UD... 

The ability to develop single-gas or multigas sensors to the requiranents of different industrial applications expands in size and in complexity the sensor s parts that can be produced, as well as increasing structural efficiency and design flexibility, optimizing materials compatibility, maximizing sensor properties, and minimizing cost. Unfortunately, it has to be admitted that the advances in sensor development have not kept pace with the advances in materials. 

Melendez J., de Castro A. J., Lopez F., and Meneses J., Spectrally selective gas cell for electrooptical infrared compact multigas sensor. Sens. Actuators A, 46(47), 417-421, 1995. 

Table 15.1 summarizes notable developments in multi-gas instrumentation and volcanic electrochemical sensor deployments over the past decade. The first multigas system contained an electrochemical sensor for SO2 and a CO2 sensor based on infra-red spectroscopy. Subsequent multi-gas instrument developments include the incorporation of an additional electrochemical sensor for H2S, and infra-red spectroscopic detection of H2O alongside Recently, electrochemical... 

Further sensor response modelling approaches are in development for other multi-gas sensor pairs. In summary, it is emphasized that accurate determination of plume gas ratios from co-deployed in situ electrochemical (and other) sensors requires a consideration of sensor response times. Non-identical sensor response times can result in scatter and bias in the derived gas ratios, particularly in cases where cross-sensitivities need to be removed. Reported plume gas ratios from multigas instruments may need to be revisited in this context, and the effect is likely also important in the monitoring of other environments, such as urban pollution. 

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