Capacitive Measuring Methods: Difference between revisions
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English Translation by [[user:SLeithaeuser|Sandra Leithäuser]]<br> | English Translation by [[user:SLeithaeuser|Sandra Leithäuser]]<br> | ||
back to [[Air Humidity Measurement|Air Humidity Measurement]] <br> | back to [[Air Humidity Measurement|Air Humidity Measurement]] <br> | ||
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== Abstract == | == Abstract == | ||
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*Limited long-term stability | *Limited long-term stability | ||
*Susceptible to condensation and corrosive media | *Susceptible to condensation and corrosive media | ||
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[[Category:Humidity Measurement]] [[Category:Schwarz,Hans-Jürgen]] [[Category:inProgress]] [[Category:R-SLaue]] [[Category:R-HSchwarz]] | [[Category:Humidity Measurement]] [[Category:Schwarz,Hans-Jürgen]] [[Category:inProgress]] [[Category:R-SLaue]] [[Category:R-HSchwarz]] | ||
Revision as of 10:32, 28 October 2012
Author: Hans-Jürgen Schwarz
English Translation by Sandra Leithäuser
back to Air Humidity Measurement
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A major advantage of the capacitive measuring method, is the wide temperature range in which humidity measurements can be performed. For instance, some modern, industrially used humidity sensors allow for measuring humidity and temperature with a standardized output signal at -40°C to 180°C. The capacitive measuring method has another advantage: due to the purely electrical measurement, the humidity sensors can be equipped with the latest high quality microprocessor technology that offer a wide range of features. Gas pressures and air velocities have little influence on the capacitive humidity sensor, therefore versions are available that work in pressure-loaded systems between 0-100 bar.
The accuracy varies between devices and ranges between ± 2% and ± 5% RH. Sometimes an accuracy of even ± 1% RH may be achieved.
Advantages:
- Inexpensive, quick and precise
- Wide measuring range (0 .. 100 %RH, -4 .. +180 ºC
- Long-term stability
- Small, portable devices
- Does not depend on air pressure
- Measuring is possible without maintenance, even at temperatures below freezing
Disadvantages:
- Limited long-term stability
- Susceptible to condensation and corrosive media
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