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Open Roads Forum  >  Tech Issues

 > Looking for time/temp display that shows full time Dew Point

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stacaz822

Phoenix, Arizona

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Posted: 09/10/19 06:03pm Link  |  Quote  |  Print  |  Notify Moderator

Has anyone found a fairly cheap time/temp/indoor/outdoor/moon phase type display that shows full time Dew Point temp? I find this to be much more useful than relative humidity. It is a simple calculation based on temp and RH...


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Rover_Bill

NE. Ohio

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Posted: 09/10/19 11:24pm Link  |  Quote  |  Print  |  Notify Moderator

Dew Point temperature (wet-bulb temp) along with the air temperature (dry-bulb temp) is measured by a psychrometer. I'm not aware of any inexpensive devices that contain a psychrometer to display an accurate wet-bulb temp.

An accurate Relative Humidity is derived from those wet/dry bulb reading. Many mechanical (analog) and electronic (digital) instruments only give a gross RH approximation. If that RH value is calculated back to a wet-bulb temp from those displays, the margin of error would be +/- 5 degrees (or more). That error makes a dew point temp display grossly inaccurate.

Oregon Scientific sells a nice line of home weather instruments. THIS is the one I have in my trailer.


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stacaz822

Phoenix, Arizona

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Posted: 09/14/19 08:38pm Link  |  Quote  |  Print  |  Notify Moderator

Rover_Bill wrote:

Dew Point temperature (wet-bulb temp) along with the air temperature (dry-bulb temp) is measured by a psychrometer. I'm not aware of any inexpensive devices that contain a psychrometer to display an accurate wet-bulb temp.

An accurate Relative Humidity is derived from those wet/dry bulb reading. Many mechanical (analog) and electronic (digital) instruments only give a gross RH approximation. If that RH value is calculated back to a wet-bulb temp from those displays, the margin of error would be +/- 5 degrees (or more). That error makes a dew point temp display grossly inaccurate.

Oregon Scientific sells a nice line of home weather instruments. THIS is the one I have in my trailer.




How about this one. I don't mind +- 4%.... https://www.homedepot.com/p/Extech-Instruments-Big-Digit-Humidity-Alert-Hygro-Thermometer-445814/203711583?cm_mmc=Shopping%7CG%7CVF%7CD27E%7C27-11_TOOLS_%26_ACCESSORIES%7CNA%7CPLA%7c71700000033101173%7c58700003868916496%7c92700031085777931&gclid=Cj0KCQjwn_LrBRD4ARIsAFEQFKvDGCvQSwWv5Oue4CXuhmQZJ1Bcj6m2ZBZEmmaQlXFDgpgUrJOUz5EaAqLwEALw_wcB&gclsrc=aw.ds

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