page 4
Version 2.4_en
100
%
Mn
Mt
Mn
F
Calibration curves
Calibration curves
Declaration
Measuring range
Wood chips
Standard wood chips
10 - 50 %
Coarse chips
Coarse wood chips
10 - 50 %
Industrial chips
Industrial wood chips
10 - 50 %
Test block
! Only for testing the BLL with the test block !
Wood chips:
standard chips of wood (forest wood chips)
according to standard EN ISO 17225-1 class
P16, P31
and
P45
.
Coarse chips:
for coarse wood chips
P45 or P31 but
with
fewer fines.
Industrial chips:
for industrial chips of wood
without barks and
fines
(similar
P45
or
P63
)
Definition of wood chips classes (according EN ISO 17225-1)
The stated numbers refer to the particle size that goes through
round gaps of the corresponding diametres (e.g. P16: 16 mm).
o
P16
minimum 75% of the bulk is between 3.15 and 16 mm
o
P31
minimum 75% of the bulk is between 8 and 31.5 mm
o
P45
minimum 75% of the bulk is between 8 and 45 mm
o
P63
minimum 75% of the bulk is between 8 and 63 mm
Compression of wood chips
The humimeter BLL is calibrated for normally compressed wood chips. If the
measured wood chips are compressed to a much lesser or greater extent,
this will cause measuring imprecisions. Normally compressed wood chips
are defined in norm EN 15103 (determination of the bulk density).
Determination of the material reference moisture
The principle is a comparison measurement with the dehydration
method according to EN 14774. Take the measured sample and
weigh it. Dry it out in an oven and weigh it again.
M
n
: Mass with average moisture content
M
t
: Mass of the dried sample
%F: Calculated absolute moisture