LiCl Condensation Hygrometer: Difference between revisions
Jump to navigation
Jump to search
No edit summary |
No edit summary |
||
| Line 4: | Line 4: | ||
back to [[Moisture measurement methods|Moisture measurement methods]] | back to [[Moisture measurement methods|Moisture measurement methods]] | ||
<br> | <br> | ||
{{underConstruction}} | |||
<!-- | <!-- | ||
== Abridged Version == | == Abridged Version == | ||
The LiCl condensation hygrometer '''(also called a DEWCON-sensor?? Habe ich nicht gefunden)''' is an electrolytic conductivity sensor. | The LiCl condensation hygrometer '''(also called a DEWCON-sensor?? Habe ich nicht gefunden)''' is an electrolytic conductivity sensor. | ||
[[Datei:Schematischer Aufbau eines LiCL-Messelements.JPG|thumb|left|300px|'''Abbildung 1''' - Schematischer Aufbau eines LiCl-Messelementes [Weber:1995]]] | |||
The principle of operation is that the LiCl-salt containing ceramic sensor, which has been equipped with a heating meander and Pt 500 measuring resistor, heats up until it reaches the [[Deliquescence humidity|equilibrium moisture level/deliquescence humidity]] of the salt. At this point, no more electric current flows and the heating stops, resulting in a temperature drop. Now the sensor picks up moisture again and starts re-heating. After a while and at a specific temperature, the sensor adjusts to equilibrium. The temperature depends exclusively on the water vapor partial pressure of the ambient air. Automatically, and free of hysteresis, the water vapor pressure of the ambient air that is to be measured, is kept in equilibrium and the sensor temperature is a physically clear measure of the dew-point, similar to the automatic dew-point hygrometer. | The principle of operation is that the LiCl-salt containing ceramic sensor, which has been equipped with a heating meander and Pt 500 measuring resistor, heats up until it reaches the [[Deliquescence humidity|equilibrium moisture level/deliquescence humidity]] of the salt. At this point, no more electric current flows and the heating stops, resulting in a temperature drop. Now the sensor picks up moisture again and starts re-heating. After a while and at a specific temperature, the sensor adjusts to equilibrium. The temperature depends exclusively on the water vapor partial pressure of the ambient air. Automatically, and free of hysteresis, the water vapor pressure of the ambient air that is to be measured, is kept in equilibrium and the sensor temperature is a physically clear measure of the dew-point, similar to the automatic dew-point hygrometer. | ||
Revision as of 11:04, 28 October 2012
Author: Hans-Jürgen Schwarz
English Translation by Sandra Leithäuser
back to Moisture measurement methods
| This article will be released soon. |