Measuring
51
EN
5.1
Resistance measurements (wood)
The resistance measurement uses the needles/electrodes at the base of the instru-
ment. The meter will automatically determine the wood moisture
u
. This is the water
mass
m
w
bound in the fuel and related to the absolute dry fuel mass
m
B
according to
equation (1):
𝑢 =
𝑚
𝑤
𝑚
𝐵
∙ 100%
Equation 1
Explanation:
u
= wood moisture
m
w
= water mass bound in the wood
m
B
= absolute dry fuel mass
NOTE!
According to the above equation the wood moisture may be higher than 100 %.
The wood moisture must not be confused with the water content. The water content is
the water mass related to the total mass of fuel and water (wet basis).
𝑤 =
𝑚
𝑤
𝑚
𝐵
+ 𝑚
𝑤
∙ 100 %
Equation 2
Explanation:
w
= water content
m
w
= water mass bound to wood
m
B
= absolute dry fuel mass
The wood moisture can be converted to the water content as follows:
𝑤 =
𝑢
1+𝑢
∙ 100%
Equation 3
Explanation:
w
= water content
u
= wood moisture
Содержание HBF 420
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