111
MRS-BA-defsi-0410
Description/calculation of the units
Explanation of the variables used
•
MW: Moist weight (weight value at the start of the
measurement)
•
DW: Dry weight (weight value at the end of the
measurement)
Unit Calculation
Dry mass in percent:
100 - 0%
DW
MW
-----------
100%⋅=
Moisture in percent:
0 - 100%
MW DW–
MW
-------------------------
100%⋅–=
ATRO dry mass:
ATRO 100 - 999%
MW
DW
-----------
100%⋅=
ATRO moisture:
ATRO 0 - 999%
MW DW–
DW
---------------------------
100%⋅–=
Residual weight in g / kg [‰]:
g / kg
DW
MW
-----------
1000⋅=
Residual weight in g:
RESIDUAL WEIGHT D W=
Moisture in g:
WEIGHTLOSS MW DW–=
Current balance weight in g:
BALANCEWEIGHT NETWEIGHT=
Explanations for the ATRO units
The ATRO unit is required exclusively in the wood industry.
In practice, wood contains different amounts of water, which can
change continuously. The water content affects the combustion
performance of the wood and the heat value. The water evaporates
during drying. When wood is stored in the open air, it reaches the
so-called air-dried status (A.D.) of 15% to 20% water content. The
moisture is completely removed from the wood by heating the wood
to temperatures over 100°C. This condition is called absolutely dry
(abs.dry).
The wood moisture (ATRO) is the amount of water contained in the
wood, expressed in terms of the percentage of the mass of the
water-free wood and is calculated from the difference between the
fresh weight (MW) and the dry weight (DW).
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