Moisture Meters: Correcting for Temperature
I asked a company in Holland that sells moisture meters if the weather has anything to do with why the meters are not working and the guy told me that the moisture inside the wood freezes and I will not get a correct reading. I funny thing is I have done this job for the past five years and have never had this kind of a problem (that I know of). Does anyone have any insight to this or know anything about this?
From Gene Wengert, forum technical advisor:
I assume you are dealing with air-dried or kiln-dried lumber. The moisture in the wood does not freeze at this moisture level. However, there is a correction of about 1% MC for every 20 F above or below 70 F for pin meters. So, if the wood temperature is 30 F, then the meter will read about 2% lower than the true reading (that is, reading is 7% MC, the true value is 9% MC). Note that an incorrect oven test will almost always result in a lower MC than the true value.
Incidentally, it is the wood temperature and not the air temperature that matters. Of course, sometimes they are equal. Sometimes if the meter or wires are cold and the brought into a warmer and more humid room, moisture will condense in the wire or meter and give a false reading.
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