Author Topic: humidity sensor  (Read 2674 times)

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Offline adomas

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humidity sensor
« on: July 03, 2008, 10:20:04 AM »
Just a short question: what will happen, if a humidity sensor is put in the soil :?: Will it show all time 100% humidity? Will it be damaged or not #-o Thanks.

Offline WeatherBeacon

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Re: humidity sensor
« Reply #1 on: July 03, 2008, 11:02:29 AM »

First, I'm no electronics expert, but I suspect it would damage your humidity sensor. It's designed for the air, not soil.

Second, by doing so you'd be mixing apples and oranges. I believe humidity sensors are still designed to work in concert with the thermometer to give the relative humidity reading. Both need to be exposed to air in the same vicinity. Imagine placing the thermometer outside and placing the humidity sensor in the bathroom with a hot shower running. Suppose the station says the relative humidity is 80%. Does that mean the humidity outside or the humidity in the bathroom is 80%? Neither. The reading is pretty meaningless because the two sensors that are meant to work together are exposed to different conditions.

Third, you can get soil moisture sensors for some stations (Davis, for example).


Mae govannen!
Kevin  (Member AMS)               Genesee County, Michigan
Hardware:  Davis Vantage Pro Wireless, Midland WR-300
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Offline ccronan

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Re: humidity sensor
« Reply #2 on: November 25, 2008, 10:20:39 PM »
At the risk this topic is abandoned: modern humidity sensors have combined water vapor and temperature on a single chip.  I don't think it would read 100% unless the ground is saturated.  And you would have to make sure the sensor would not get physically wet.  I think it could be done but I also think, unless you're in a desert environment, there won't be much dynamic range to the humidity readings.