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Application of electronic nose and ion mobility spectrometer to quality control of spice mixtures
(2009)
Five miniaturized sensors based on dew-point,
capacitance or resistance measurement were tested for the
detection of humidity in compressed gases.
The dew-point sensors with optical or dielectric detection of
condensation were used at gas pressures up to 3 MPa in
dew-point range of -20 to 70°C and show no systematic
deviation and an uncertainty of dew-point temperature
mostly less than 1 K. The LiCl sensor has also a low
uncertainty but exhibit a systematic deviation to higher
values of dew-point. Capacitive polymer sensors can
indicate also a dew-point, even down to -70 °C and have an
uncertainty of about 1 to 2 K. The oxide sensor works in the
dew-point range of -10 to 20°C and has a signal what
exponential decreases with increasing gas pressure up to 10
MPa.
All types of sensor can be applied in compressed gases at
least up to 3 MPa, but their different change of sensor signal
due to the gas pressure has to be considered.