Application Notes
29
Hydromette BL A plus
5.1.3
Test
adapter
for
resistance-based
wood
moisture measurement
The test adapter available with order no. 6070 for checking the
wood moisture measuring part can be used to check the
functionality of the device, the measuring cable MK 8 and the
electrodes M 18 and M 20.
For this, the device is connected with measurement cable MK 8
and the 4-mm plug of the cable in the socket of the test adapter.
The device must be set to wood type 4 and manual temperature
compensation set to 20 °C. No active sensor may be connected.
The display should show 21% at the top right in the first line. A
difference of +/- 0.5% is permitted.
5.1.4
Wood equilibrium moisture content
If wood is stored in a particular climate for a long period, it takes up
the moisture matching this climate, which is termed equilibrium
moisture content or equilibrium wood moisture content.
On reaching the equilibrium moisture content, the wood no longer
loses moisture if the surrounding conditions remain the same and
also does not absorb any moisture.
The wood equilibrium moisture content is between approx. 6.0 and
7.5% wood moisture (corresponds to 30
–40% relative humidity and
20-25 °C) in the winter months, and between approx. 10.5 and
13.0% (corresponding to 60
–70% relative humidity and 25 °C) in
the summer months. Further values and tables can be found on the
World Wide Web.
