Portable Lumber Grader
Structural lumber strength classes are determined by the EN-338 norm. The Portable Lumber Grader is designed to grade lumber according to the above norm, that handles two different species classes: deciduous and coniferous including poplar. Grading is based on the modulus of elasticity (MOE) and the average specific gravity of the lumber. The Portable Lumber Grader system determines the MOE and specific gravity as quickly as possible (1 second/lumber).
Load weighing scale.
Hit the end of the lumber by a hammer.
The results appear on the screen and, at the same time, also played as a voice message.
Weighing scale
Scale display unit
Tape measure
Steel hammer (100 g)
Battery and charger
Microphone
USB to serial converter cable
Portable Lumber Grader Software
User's manual
Specification |
Details |
|---|---|
Weighing scale |
|
Dimensions |
250 x 75 x 90 mm |
Capacity |
30-500 kg |
Resolution |
10 g |
Output |
RS232 signal |
Power supply |
12 V adapter or 4 AA size batteries |
Microphone |
|
Type |
Unidirectional |
Sensitivity |
-56 dB (0 dB = 1 V/mbar at 1000 Hz) |
Frequency range |
100 - 15000 Hz |
Operational temperature |
5 - 40 °C |
Hammer |
|
Weight |
0.1 – 3% of the lumber weight |
Grading |
|
Principle |
mass, CKDR and MOE determination |
Time requirement |
~1 s |
Grading table |
identical to the EN-338 norm |
