Checkline BLL - Manual (Page 3)

 Electromatic Equipment Co., Inc.
-14-
NOTES
 Electromatic Equipment Co., Inc.
-3-
2.0 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 EU-norm
CEN/TS 14961 class P16 and P45.
• Coarse chips: for coarse wood chips P45 but with fewer fines.
• Industrial chips: for industrial chips of wood without barks and fines (similar
P63)
Definition of wood chips classes
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 80% of the bulk is between 3,15 and 16 mm
o P45 minimum 80% of the bulk is between 3,15 and 45 mm
o P63 minimum 80% of the bulk is between 3,15 and 63 mm
Compression of wood chips
The 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 CEN/TS 15103
(determination of the bulk density).
3.0
DETERMINATION OF THE MATERIAL REFERENCE MOISTURE
The principle is a comparison measurement with the dehydration method according
to CEN/TS 14774. Take the measured sample and weigh it. Dry it out in an oven
and weigh it again.
100 %
×
−
=
Mn
Mt Mn
F
M n : Mass with average moisture content
M t : Mass of the dried sample
%F: Calculated moisture content