EQUIPMENT FOR MEASUREMENT&CONTROL AND DRYERS
B. Nikolica-Serjoze 12, 18000 Nis, Serbia; Phone/Fax:+38118 211-212, 217-468; office@nigos.rs; www.nigos.rs
Automatic control unit MC-2000 (version 5.4.6) 5
2.4.CONNECTION OF TEMPERATURE, EMC AND 8-POINTS MC MEASUREMENT SET
In the standard configuration, measuring set for temperature, EMC and 8-
points wood MC is included with MC-2000 controller. This measuring set
consists of one MKM-08 box, two boxes DS-04t, probes, sensors and
appropriate cables.
DS-04t box is made to provide connection of temperature probe,
equilibrium moisture content (EMC) probe and four wood moisture (MC)
probes to communication box MKM-08. DS-04t boxes are placed inside
the drying chamber, MKM-08 is placed outside.
Temperature measurement: Temperature probe (sensor) Pt1000 is used
for temperature measurement. This probe is mounted inside the DS-04t
box in NIGOS factory, and is connected to printed circuit board UGL-01
which is also mounted inside the DS-04t box. See picture 2.4 for
LI6YC6Y 12x0.34mm2cable connection.
Equilibrium Moisture Content (EMC) measurement: Two hole-plugs,
marked EMC, are placed on the top of the DS-04t box. They are for
connecting EMC paper holder and DS-04t box, as shown on picture 2.5.
EMC paper is rectangular shaped and made of special hydroscopic
material. Since one EMC paper-element is used for ONE drying cycle
only, it should be discarded after it, and new one should be fitted when a
new drying cycle starts. Certain amount of this paper (sufficient for
exploitation in period of 1 to 2 years) is delivered to user upon delivery of
other equipment. Additional amounts of the paper are provided when
needed or during regular service. Unused EMC paper should be stored on
a dry and dark place.
EMC paper fitting sequence: Unscrew nuts on the paper holder, so the
springs remain free. Place new EMC paper between aluminum plates.
Screw nuts back to achieve good coherence between EMC paper and
aluminum plates.
NOTE: EMC paper is used for ONLY ONE drying cycle. That means,
after each drying cycle is finished, the old EMC paper should be discarded
and replaced with new one according to given instructions
Picture 2.5. Connection of the measurement elements to
DS-04t and EMC paper holder
Measurement of wood moisture content (MC) in 8 points: 8-points MC measurement set consists of 4 connection cables and a set of wood
moisture probes. These probes are multiple-time-use INOX nails.
Drying process is primarily based on average wood MC that is obtained from 8 different measuring spots. Therefore, proper fitting of the
probes in the wood and their symmetrical disposition inside the chamber is most important.
STAINLESS STEEL NAIL PROBES SET-UP (probes for multiple use):
These are stainless steel (INOX) - multiple use probes. After each drying cycle they must be carefully taken out of timber and saved for later
use. They are replaced with new ones only in case of mechanical damage. Each MC probe has one pair of stainless steel nails. Recommended
lengths of nails are: 30 mm used for lumber up to 40 mm thick (thin lumber); 45 mm used for lumber above 40 mm thickness (thick
lumber). One pair of probes is used for each MC measurement point. Probes are hammered in the lumber perpendicularly to board at distance
of 30 to 35 mm (optimally 32 mm). A pair of holes Ø3.2 (3 ÷ 3.5) mm should be drilled in the lumber before hammering the probes. Depth
should be 15 mm shorter than the probes' length. Probes should be than hammered into the holes whit paying attention that the depth of
penetration must not be smaller than 1/3 of board depth (1/2 of board depth is best). In case when thin and soft lumber is used, user does not
need to drill holes, but he can hammer the probes directly into the lumber. Probe cable is connected on the other side to the patch board (DS-
04t) placed on the wall, inside the drying chamber.
