Comparison of the Measuring Method: Difference between revisions
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Author: [[User:Hschwarz|Hans-Jürgen Schwarz]]<br> | Author: [[User:Hschwarz|Hans-Jürgen Schwarz]]<br> | ||
<br> | |||
English Translation by [[user:SLeithaeuser|Sandra Leithäuser]]<br> | |||
<br> back to [[Air Humidity Measurement|Air Humidity Measurement]] <br> | |||
{{underConstruction}} | |||
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The table lists the different measuring principles, evaluates them and shows the different criteria for their application. | |||
The table lists the different measuring principles, evaluates them and shows the different criteria for application. | |||
<br clear="all"> | <br clear="all"> | ||
{|border="2" cellspacing="0" cellpadding="4" width="100%" align="left" class="wikitable sortable" | {|border="2" cellspacing="0" cellpadding="4" width="100%" align="left" class="wikitable sortable" | ||
|+''Table 1: Comparison of moisture measuring methods ( | |+''Table 1: Comparison of moisture measuring methods (according to <bib id="Weber:1995"/>) '' | ||
|- | |- | ||
|bgcolor = "#F0F0F0" | '''Name''' | |bgcolor = "#F0F0F0" | '''Name''' | ||
| Line 17: | Line 22: | ||
|- | |- | ||
|bgcolor = "#F7F7F7" | '''Chilled mirror hygrometer''' | |bgcolor = "#F7F7F7" | '''Chilled mirror hygrometer''' | ||
|bgcolor = "#FFFFEO" | | |bgcolor = "#FFFFEO" | condensation on a chilled mirror | ||
|bgcolor = "#FFFFEO" | a | |bgcolor = "#FFFFEO" | a | ||
|bgcolor = "#FFFFEO" | g | |bgcolor = "#FFFFEO" | g | ||
| Line 24: | Line 29: | ||
|bgcolor = "#FFFFEO" | 0 - 40 °C | |bgcolor = "#FFFFEO" | 0 - 40 °C | ||
|- | |- | ||
|bgcolor = "#F7F7F7" | ''' | |bgcolor = "#F7F7F7" | '''Capacitive <br>(Al-Oxide)''' | ||
|bgcolor = "#FFFFEO" | change in capacitance | |bgcolor = "#FFFFEO" | change in capacitance | ||
|bgcolor = "#FFFFEO" | a | |bgcolor = "#FFFFEO" | a | ||
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|- | |- | ||
|bgcolor = "#F7F7F7" | '''LiCl''' | |bgcolor = "#F7F7F7" | '''LiCl''' | ||
|bgcolor = "#FFFFEO" | LiCl | |bgcolor = "#FFFFEO" | LiCl equilibrium temperature | ||
|bgcolor = "#FFFFEO" | a | |bgcolor = "#FFFFEO" | a | ||
|bgcolor = "#FFFFEO" | g | |bgcolor = "#FFFFEO" | g | ||
| Line 40: | Line 45: | ||
|bgcolor = "#FFFFEO" | -10 - 50 °C | |bgcolor = "#FFFFEO" | -10 - 50 °C | ||
|- | |- | ||
|bgcolor = "#F7F7F7"| ''' | |bgcolor = "#F7F7F7"| '''Infrared''' | ||
|bgcolor = "#FFFFEO" | absorption | |bgcolor = "#FFFFEO" | absorption of infrared light | ||
|bgcolor = "#FFFFEO" | a | |bgcolor = "#FFFFEO" | a | ||
|bgcolor = "#FFFFEO" | g,l,s | |bgcolor = "#FFFFEO" | g,l,s | ||
| Line 76: | Line 81: | ||
|bgcolor = "#FFFFEO" | r | |bgcolor = "#FFFFEO" | r | ||
|bgcolor = "#FFFFEO" | g | |bgcolor = "#FFFFEO" | g | ||
|bgcolor = "#FFFFEO" | + direct display, | |bgcolor = "#FFFFEO" | + direct display, rinsible<br>- inaccurate, sensitive to dust | ||
|bgcolor = "#FFFFEO" | 0 - 100% RH | |bgcolor = "#FFFFEO" | 0 - 100% RH | ||
|bgcolor = "#FFFFEO" | -30 - 110 °C | |bgcolor = "#FFFFEO" | -30 - 110 °C | ||
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|bgcolor = "#FFFFEO" | r | |bgcolor = "#FFFFEO" | r | ||
|bgcolor = "#FFFFEO" | g | |bgcolor = "#FFFFEO" | g | ||
|bgcolor = "#FFFFEO" | +low price, small, quick<br>- | |bgcolor = "#FFFFEO" | +low price, small, quick<br>- drift, chemically sensitive,<br>calibration | ||
|bgcolor = "#FFFFEO" | 0 - 100% RH | |bgcolor = "#FFFFEO" | 0 - 100% RH | ||
|bgcolor = "#FFFFEO" | -40 - 180 °C | |bgcolor = "#FFFFEO" | -40 - 180 °C | ||
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|- | |- | ||
|bgcolor = "#F7F7F7" | '''Resistive''' | |bgcolor = "#F7F7F7" | '''Resistive''' | ||
|bgcolor = "#FFFFEO" | | |bgcolor = "#FFFFEO" | resistance of a hygroscopic layer | ||
|bgcolor = "#FFFFEO" | r | |bgcolor = "#FFFFEO" | r | ||
|bgcolor = "#FFFFEO" | g | |bgcolor = "#FFFFEO" | g | ||
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*'''''time response.''''' | *'''''time response.''''' | ||
The '''''time response''''' for most sensors is mainly determined by the amount of water needed for equilibrium. However, the time the water takes to diffuse onto the sensor needs to considered, too. Since this amount of water can be provided or discharged by the ambient air, the amount of air that flows onto a sensor plays an important role. | The '''''time response''''' for most sensors is mainly determined by the amount of water needed for equilibrium. However, the time the water takes to diffuse onto the sensor needs to be considered, too. Since this amount of water can be provided or discharged by the ambient air, the amount of air that flows onto a sensor plays an important role. | ||
Because the diffusion rate is a function of temperature, a sensor will always have a slower reaction the lower the temperature. Other factors apply for sensors with different measuring principles, e.g. chilled mirror hygrometer. | Because the diffusion rate is a function of temperature, a sensor will always have a slower reaction the lower the temperature. Other factors apply for sensors with different measuring principles, e.g. chilled mirror hygrometer. | ||
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<br clear="all"> | <br clear="all"> | ||
{|border="2" cellspacing="0" cellpadding="4" width="70%" align="left" class="wikitable sortable" | {|border="2" cellspacing="0" cellpadding="4" width="70%" align="left" class="wikitable sortable" | ||
|+''Table 2: | |+''Table 2: Response time of different measurement methods (according to <bib id="Weber:1995"/>)'' | ||
|- | |- | ||
|bgcolor = "#F0F0F0" | '''Type''' | |bgcolor = "#F0F0F0" | '''Type''' | ||
|bgcolor = "#F0F0F0" | '''T<sub>50</sub>-time''' | |bgcolor = "#F0F0F0" | '''T<sub>50</sub>-time''' | ||
|bgcolor = "#F0F0F0" | '''Interval | |bgcolor = "#F0F0F0" | '''Interval''' | ||
|- | |- | ||
|bgcolor = "#F7F7F7" | ''' | |bgcolor = "#F7F7F7" | '''Resistive''' | ||
|bgcolor = "#FFFFEO" | <nowiki><</nowiki> 60 s | |bgcolor = "#FFFFEO" | <nowiki><</nowiki> 60 s | ||
|bgcolor = "#FFFFEO" | 30 / 80 % RH | |bgcolor = "#FFFFEO" | 30 / 80 % RH | ||
|- | |- | ||
|bgcolor = "#F7F7F7" | ''' | |bgcolor = "#F7F7F7" | '''Capacitive''' | ||
|bgcolor = "#FFFFEO" | <nowiki><</nowiki> 5 min | |bgcolor = "#FFFFEO" | <nowiki><</nowiki> 5 min | ||
|bgcolor = "#FFFFEO" | 30 / 80 % R | |bgcolor = "#FFFFEO" | 30 / 80 % R | ||
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|bgcolor = "#FFFFEO" | <nowiki>-</nowiki>20 / 0 °C TP | |bgcolor = "#FFFFEO" | <nowiki>-</nowiki>20 / 0 °C TP | ||
|- | |- | ||
|bgcolor = "#F7F7F7" | ''' | |bgcolor = "#F7F7F7" | '''Elektrolytic''' | ||
|bgcolor = "#FFFFEO" | <nowiki><</nowiki> 30 min | |bgcolor = "#FFFFEO" | <nowiki><</nowiki> 30 min | ||
|bgcolor = "#FFFFEO"| 0 / 100 ppm | |bgcolor = "#FFFFEO"| 0 / 100 ppm | ||
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|bgcolor = "#FFFFEO" | 10 / 90 % RH | |bgcolor = "#FFFFEO" | 10 / 90 % RH | ||
|} | |} | ||
<br clear="all"> | <br clear="all"> | ||
== Literature == | |||
[[Category:Humidity Measurement]] [[Category:R-HSchwarz]] [[Category:R-SLaue]] [[Category: | <biblist/> | ||
--> | |||
[[Category:Humidity Measurement]] [[Category:R-HSchwarz]] [[Category:R-SLaue]] [[Category:inProgress]] | |||
Revision as of 16:46, 9 November 2012
Author: Hans-Jürgen Schwarz
English Translation by Sandra Leithäuser
back to Air Humidity Measurement
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