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re: problems with humidity
6 dec 2000
k3 wrote:
>hello nick,
hello kendall,
>i've been checking around for one of those "thingy's" that measures the
>humidity (along with the temp and barometric pressure), but they're all so
>expensive? got a name for the "thingy" that measures humidity and a source
>where i can purchase one that's not too expensive?
brannon makes a small combination dial temperature and relative humidity
meter, $18.95 for 1 or $11.37 each for 5 from greenhouse supplier e.c.
geiger at (800) 4-geiger. you need to adjust that rh measurement using
the room temp to find absolute humidity.
or you might use a glass of water and some ice and a metal- or plastic-
shielded stick thermometer (so the glass doesn't break when you stir the
ice) or an $11 taylor model 8840 digital version, -58 to 302 f in 0.1 f
increments.
>i am gonna try your experiment... i'm gonna place a glass of ice water both
>upstairs and downstairs and see which one develops condensation on the
>outside of the glass first...
might as well start with warm water and ice and measure the water temp
when condensation starts to form on the outside of the glass as the water
cools. you want to know the absolute vs relative humidity, and this dew
point measurement is simpler and more accurate. the higher the dew point,
ie water temp, the more moisture in the air, regardless of the room temp.
>...i've got the woodstove running downstairs right now which is definately
>gonna give me a false reading. maybe i should wait until we have a warmer
>day where as i don't need to burn the woodstove downstairs?
i'd measure both. if the absolute moisture in the basement air is higher
than the moisture in the upstairs air when the woodstove is running, you
may be evaporating moisture from the basement floor and walls and moving
it upstairs with the woodstove, and putting a vapor barrier (plastic film
or foamboard) over the walls and floor may help.
nick
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