Semiconductor gas sensors are popular commercial sensors applied in
numerous gas detection systems. They are reliable, small, rugged and
inexpensive. However, there are a few problem limiting the wider use of
such sensors.
Semiconductor gas sensor usually exhibits a low selectivity, low
repeatability, drift of response, strong temperature and moisture
influence on sensor properties. Sample flow rate is one of the
parameters that influence sensors response what should be considered in
the measurement system.
This paper describes low cost module for controlling measured gas flow
rate. The proposed equipment will be used as a component of electronic
nose system employed for classifying and distinguishing different levels
of contamination in air.
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