Resistance Measurements (Wood) - Wohler HBF 420 Bedienungsanleitung

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 bound in the fuel and related to the absolute dry fuel mass m
w
equation (1):
Explanation:
u = wood moisture
m = water mass bound in the wood
w
m = absolute dry fuel mass
B
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).
Explanation:
w = water content
m = water mass bound to wood
w
m = absolute dry fuel mass
B
The wood moisture can be converted to the water content as follows:
Explanation:
w = water content
u = wood moisture
�� = ∙ 100%
��
��
��
��
�� =
�� = ∙ 100%
��
1+��
∙ 100 %
��
��
�� + ��
�� ��
Measuring
according to
B
Equation 1
Equation 2
Equation 3
49
EN