Nigos DVD-240 Quick Reference Manual

TABLE OF CONTENTS

1.

QUICK REFERENCE GUIDE

2.

TECHNICAL SPECIFICATION

3.

DESCRIPTION OF MOISTURE METER

4.

TURNING METER ON / OFF AND AUTOCALIBRATION PROCEDURE

5.

DEVICE SET-UP AND ADJUSTMENT FOR MEASUREMENT

5.1

WOOD DENSITY (TYPE) parameter setting
WOOD THICKNESS parameter setting

5.2

WOOD MOISTURE CONTENT MEASUREMENT

6.

Timber MC measurement procedure

6.1

Veneer MC measurement procedure

6.2

6.3 HOLD

7. MAINTENANCE

APPENDIX

8.

8.1 :

8.2 Appendix 2: Wood density table

9. AIR TEMPERATURE AND RELATIVE HUMIDITY MEASUREMENT (OPTIONAL)

9.1 Air temperature and relative humidity measurement procedure

function

AND BATTERY REPLACEMENT

.......................................................................................................................................... 20

Appendix 1 Additional information regarding wood density and wood moisture content

................................................................................................................... 2

................................................................................................................. 5

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1. QUICK REFERENCE GUIDE

1. Turning the meter ON

ON

- Press the button briefly (back side untouched)

- Wait for autocalibration process to end and()
to be displayed

0)0

OFF

kal

2. Wood density adjustment

t

3

m

- Press and hold button
to adjust timber density (given in t/ )m

; use and

3

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0ff

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ON

OFF

)64

t

3

m

3

2#0

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ON

OFF

UP/DOWN

mm

t

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3

)64

HOLD

ON

OFF

UP/DOWN

mm

t

m

3

HOLD

3. Wood thickness adjustment 4. Measurement - moisture content reading

mm

- Press and hold button ; use and

to adjust wood thickness (given in mm)

2#0

UP/DOWN

mm

- Gently press the back side of the meter on the flat
and smooth surface of wood sample "along fibers"

- Read the measured value on display (in %MC)

- Repeat the measurement in several points

1%1

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ON

OFF

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ON

OFF

UP/DOWN

mm

t

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5. Measurement - option HOLD

-

If needed, press briefly button to hold the
measured value displayed for later reading

- Press same button again to continue measuring

HOLD

6. Turning the meter OFF

ON

-

Press the button briefly

OFF

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&1

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0ff

HOLD

ON

OFF

2.

TECHNICAL SPECIFICATION

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5

GENERAL CHARACTERISTICS

Power supply

Display

Operating conditions

t

3

m

ON

Storage

Device dimensions W H

(xxD)

Sensor dimensions (W x H)

Weight

9 V battery, Alkaline or NiCd Aku.

LCD, digital

0

T:550C;RH:590%

¸¸T:-40 85 C;RH:5 90%

80 x 140 x 40 (mm)

()

(42 x 78)

0

(mm)

¸¸

210 g

WOOD MOISTURE METER

DVD-240

MEASUREMENT

Measurement resolution

Wood MC measurement range

Wood thickness range

Wood density range

0.1 %

(0 100) (%)

¸

(0.5 40) (mm)

¸

(

0.30 1.10) (t/m )

¸

3

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3. DESCRIPTION OF MOISTURE METER

1

2$0

2

UP/DOWN

HOLD

3

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WOOD MOISTURE METER

mm

t

ON

OFF

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4

3

m

5

6

OPEN

7

8

7

DVD-240 FRONT SIDE LAYOUT

1. displays:

LCD DISPLAY

- Measured moisture content

- Parameter values during set-up

- State and error massages

2. button

WOOD THICKNESS

3. Buttons and used for increase or

4. button

5. Power button

6. button

DVD-240 BACK SIDE LAYOUT

7. measures moisture content when

8. Battery compartment

UP DOWN

decrease of value of selected parameter

WOOD DENSITY

ON / OFF

HOLD

SENSOR PLATE

pressed against smooth wood surface

Wood moisture content meter is made for
quick reading of wood moisture by simple pressing
on flat wooden surface.

Device is placed in the plastic case with large display
for indication of all measurement data and flat
keyboard for device control.

There is a specially designed sensor plate on the
back side of the meter which measures wood MC
when pressed on the wood surface.

In order to achieve accurate measuring data using
this meter it is required to perform certain procedures
before measurement such as autocalibration and
basic parameter adjustments. Following chapters of
this manual will contain more information th
procedures.

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about ese

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4. TURNING METER ON / OFF AND AUTOCALIBRATION PROCEDURE

ON

Turning the meter ON

functions immediately after powering on. When the button is pressed, message

During this time, meter is performing procedure, i.e. series of test-measurements
required for its adaptation to current operating conditions (ambient temperature, air humidity, etc).

It is essentially important to ensure that meter during autocalibration has
such position that sensor plate hangs free in the air, i.e. there is nothing
behind sensor plate blocking it! Do not hold fingers or other objects behind
sensor plate during autocalibration. Existence of any object near sensor
plate during autocalibration procedure can corrupt this process and result
in inaccurate measurement and measuring errors.

is performed with brief pressing on the button . Meter will perform certain additional

DVD-240 AUTOCALIBRATION

OFF

kal

is displayed for few seconds.

0ff

kal

After a few seconds, when autocalibration procedure is finished, meter will
display:

Autocalibration procedure is performed each time the meter is powered ON,
which ensures reliability of measurement in all declared conditions.

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which signals that it is ready for measurement or other adjustments.

0)0

,

ON

OFF

If there is any doubt in measuring accuracy and possible error in autocalibration as a cause of false

HOLD

ON

OFF

UP/DOWN

mm

t

m

3

measurement, autocalibration should be repeated by simple turning off and turning on the meter again.

Meter can detect large calibration errors itself. In this situation, after removing all objects away from back side
of the meter (so it "measures air"), message is displayed.

Turning meter OFF is performed with short pressing on the button .
Display will shortly display message
When it is turned off, the meter does not consume energy from the
battery

.

Ler

0ff

after which it will turn off.

ON

OFF

0ff

0ff

9

UP/DOWN

ON

OFF

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5.

DEVICE SET-UP AND ADJUSTMENT FOR MEASUREMENT

Correctly performed autocalibration upon powering the meter ON is not enough for accurate measurement.
It is required to set up the meter for specific type (i.e.. density) of timber as well as appropriate thickness of wooden
sample (board or veneer). This step during device set-up must not be forgotten because measured value greatly
depends on this parameter setting.
Once the parameters are set-up, they remain memorized and ready for use for next measurements (if the same
type of timber is tested), but parameter checking is suggested before each use.

5.1 WOOD DENSITY (TYPE) parameter setting

Information regarding type of wood for MC measurement is given via for that type of wood.
That is why it is required to determine wood density in as precisely as possible. Wood density is most

3

t/

m

WOOD DENSITY

commonly given as a table data for specific wood type (specie) when it is absolutely dry (with 0% MC).

Data regarding wood density of specific wood specie can be found in appendix of this manual, but other
reliable sources can be used.

Nondestructive portable moisture meter supports selection of WOOD DENSITY in range to

3

1.10

t/

m

.

also

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3

t/

m

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Wood density adjustment is performed in following way:

- ;

Press and hold button ( ). Device will display density value (in ) which was last enteredWOOD DENSITY

-

Holding the button pressed, press the buttons ( ) or ( ) to adjust desired value for

t

3

m

t

3

m

t/m

3

DOWN UP

density. Long pressing on these buttons will provoke faster change of
parameter in desired direction;

- Release all buttons. After this, device will again display currently measured
wood moisture content.

)53

t

3

m

11

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2#0

HOLD

ON

OFF

UP/DOWN

mm

t

m

3

5.2 WOOD THICKNESS parameter setting

12

Second essential parameter for correct moisture content measurement is thickness of the wooden sample.
Measured MC value greatly depends on this parameter (especially when thinner samples are used - thinner than
15 mm), so it is required to determine the thickness as precise as possible. Value is entered in and in range

to .

0.5 40 mm

Thickness parameter setting is performed similar to wood density (type) parameter setting:

- Press and hold pressed button ( ). Device will display
value (in mm) which was entered during last parameter set-up;

- Keeping the button pressed, press the buttons ( )

or ( ) to adjust desired value.

buttons will provoke faster change of parameter in desired direction;

- Release all buttons. After this, device will again display currently measured
wood moisture content.

UP

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mm

mm

WOOD THICKNESS

DOWN

Long pressing on these

mm

UP/DOWN

3)0

mm

HOLD

After these procedures, all needed parameters are loaded in meter's memory.

Once entered, these parameters remain stored in the memory and they are active until next adjustment.

In case there is no need to change these parameters frequently, it is enough just to check these values
before each measurement and proceed with measurement immediately.

13

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14

6.

WOOD MOISTURE CONTENT MEASUREMENT

Wood moisture content measurement is main purpose f this device. Moisture content value is given in

o

percentage (%) and displayed on LC display.

Measurement process is very simple and comes to proper placing

(aside previously described adjustment)

of the meter on the surface of wooden sample and reading of displayed value.

P

roper placing of the meter on the surface of wooden sample means following:

-

longer side of sensor plate must be parallel to wood fibers

- wooden sample must be wider than sensor plate and entire surface of sensor plate must be laid on
wooden sample

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OPEN

Complete measurement procedure is performed in following way:

- Before the start of measurement turn the meter ON. Pay attention to autocalibration process which is performed
automatically immediately after powering the meter (chapter 4);

- Check parameter settings for and and correct the values if needed;

- Position the meter on the wooden sample (back side turned to sample), check if it is placed properly, gently press
the meter and take a reading.

It is recommended to take a reading in several points (if conditions allow it) to achieve best possible knowledge
of actual moisture content and its distribution throughout entire wooden sample.

After wood moisture content measurement is finished, turn the meter OFF in order to preserve battery.

WOOD DENSITY WOOD THICKNESS

15

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6.1 Timber MC measurement procedure

16

For accurate MC measurement in timber boards following must be payed attention to:

-

Moisture distribution along depth of the board should be uniform (board surface must not be dried due to

exposure to direct sun light or during extensive drying. If necessary, cut the sample in half.

-

Place the board (sample) on wooden bars to avoid the influence of the ground on the measurement. Thick

piece of polystyrene (styropor) can be used instead of bars.

>50mm

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6.2 Veneer MC measurement procedure

Veneer MC measurement is very specific, so it is required to perform following preparation for accurate reading.

- Precisely determine sample thickness, because thickness parameter has great influence for thin samples.

- Place veneer sample on expanded polystyrene layer at least 50 mm thick (polystyrene does not influence
measuring!).

Veneer

17

>50mm

NOTES:

- Powering ON should be performed while meter is placed on the polystyrene layer (without veneer sample
beneath meter). Remove hands aside and avoid moving near the meter during autocalibration procedure.

- It is easure MC of multiple veneer layers (at least 3) with adequate thickness selection.

more accurate to m

- In case veneer is already stacked, set the thickness to 40 mm (best is to avoid this kind of measurement).

Polystyrene

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6.3

HOLD

18

function

HOLDFunction is very useful in cases where timber sample is partially unaccessible, so it is impossible to see the

display directly, but it is possible to reach the sample with the meter.

During measurement, after the meter is positioned properly and measurement conditions are stable, press
button. Meter will now freeze the measured value on the display, so it is readable even after the meter is
removed from the wooden sample.

Turning the "frozen" display OFF is performed in the same way like turning ON, with the press of the button .

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7. MAINTENANCE AND BATTERY REPLACEMENT

kal

mm

t

3

Portable meter has plastic housing which under normal exploitation conditions provide necessary
mechanical firmness and protection. Rough manipulation, hitting and exposing the meter to extreme conditions
(high temperature, high humidity, offensive chemicals, high mechanical tensions, etc) should be avoided.
Do not open the device and perform unauthorized service because it can damage device and corrupt
measuring accuracy.
Do not place stickers or other materials on sensor plate because it will corrupt measuring accuracy.
Device is supplied by one standard 9V alkaline battery. It is placed inside the housing in separate battery com­partment which can be accessed from the back side of device. When low battery is detected, "LO BAT" symbol
is displayed in upper left corner of the LC display.
Empty battery should be replaced with new one, same type.

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LO BAT

1^9

OPEN

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8. APPENDIX

Appendix 1 Additional information regarding wood density and wood moisture content

8.1

Wood density is given for wood specie (type) in absolutely dry condition (0% moisture content) and is expressed

33

t/ g/c

mm

in or . It is calculated as weight of absolutely dry wooden sample divided by its volume.

:

This density is often given as constant value for specific wood type from specific climate and it represents important
data for wood moisture content measurement.

oisture content for a given sample of wood is defined as the weight of water in wood expressed as a

Wood m

percentage of the weight of wood fibrous material (which is the weight of the absolutelly dry sample).

content is calculated by the following equation:

u (%) = (m - m ) / x100

m

ouo

u

where:

- equals wood moisture content (MC)

u(%)

-

m

equals weight of wet sample

-

m

equals weight of absolutely dry sample

o

.,

i.e wood moisture content (MC) in wooden sample equals weight of existent moisture content in sample divided

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with weight of absolutely dry (same) sample and multiplied by 100.

The moisture

8.2 Appendix 2: Wood density table

0.35

0.5

0.65

0.45

0.65

0.45

0.4

0.65

0.75

0.85

0.2

0.65

0.45

0.60

3

Birch

0.52

Camphorwood

Cedar

0.75

Cherry

Chestnut

Cypress

Daru Daru

0.6

Durian

0.82

Ebony

0.85

Elm

Fir, Silver, Douglas

Hickory

0.88

Hornbeam

Iroko

WOOD SPECIE WOOD SPECIE

Abachi (Samba)

DENSITY (t/m )

min minmax maxaverage average

0.25

Abura

Acacia

0.6

Afara, White

Afrormosia

Agathis

Alder

Ash

Atlas

0.45

0.41

0.6

Balau

Balsa

Beech

0.49

Beech, Chilean

Bintangor

DENSITY (t/m )

0.46

0.5

0.35

0.52

0.4

0.7

0.52

0.32

0.66

0.6

0.55

0.45

0.55

0.5

0.4

0.90

0.60

0.85

0.6

0.45

0.7

0.8

0.6

21

3

0.8

0.6

0.55

0.62

0.55

1.0

0.64

0.71

0.8

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22

WOOD SPECIE WOOD SPECIE

DENSITY (t/m )

min minmax maxaverage average

Ivory Wood, Pink

Jelutong

Juniper

0.3

Kapur

Kekatong

Kempass

Keranji

Keruing

Kranji

Kulim

Larch

Laurel, Chilean

Linden (Lime)

0.4

0.45

0.32

Magnolia

0.8

0.45

0.4

0.75

0.82

0.72

0.80

0.78

0.75

0.78

0.5

0.48

0.45

0.5

3

0.64

0.82

0.5

0.56

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Mahogany, African

Mahogany, Sapelli

Mahogany, White

Mahogany, Philippines

Mango Wood

Maple

Meranti, Dark Red

Meranti, Light Red

Meranti, White

Merawan

Merbau

Niangon

Nyatoh (Balam)

Oak, European

DENSITY (t/m )

0.41

0.48

0.4

0.39

0.5

0.65

0.45

0.55

0.55

0.6

0.6

0.54

0.58

0.70

0.85

0.6

0.65

0.65

3

0.9

0.75

0.63

0.93

0.4

0.75

0.7

0.7

0.65

0.50

0.45

0.35

0.7

0.4

0.45

0.72

0.82

0.52

3

Rosewood

0.57

Rubberwood

Seminai

Sequoia

Seraya

0.76

Spruce

Teak

0.48

Teak, Rhodesian

Ulin

Walnut, African

0.56

Walnut, European

Willow, White

Yew

Zebrano

WOOD SPECIE WOOD SPECIE

Okume

DENSITY (t/m )

min minmax maxaverage average

0.31

Olive Tree

Padauk

Palisander

Pear

0.55

Perupok

Pine

0.38

Pine, White, Yellow

Plum

Poplar

0.36

Pulai

Punak

Pyinkado

Ramin

DENSITY (t/m )

0.45

0.61

0.80

0.55

0.95

0.35

0.50

0.40

0.60

0.8

0.95

0.45

0.65

0.4

0.65

0.65

3

23

0.75

0.74

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24

9 AIR TEMPERATURE AND RELATIVE HUMIDITY MEASUREMENT (OPTIONAL)

.

DSVT-03 PROBE GENERAL CHARACTERISTICS

Power supply

Tube dimensions (D(mm) / )

Cable length / connector

Operating conditions

Storage

Weight

MEASUREMENT

Output signal

Temperature accuracy

Relative humidity accuracy

DVD-240

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From VD-



140 / 22

2m / USB type

T: -20 80 C; RH: 0 100%

T:-40 70 C;RH:5 90%

0

¸

¸¸

¸

0

85 g

Digital, encoded

Class 1

Class 2

On customer request, probe for air temperature and relative humidity measurement is delivered.
In that case, additional connector for connection of this probe (USB type) is installed on moisture meter .

9.1 Air temperature and relative humidity measurement procedure

Air temperature and relative humidity measurement using portable moisture meter and probe for air
temperature and relative humidity is very simple and quick. It is only required to connect the probe to
universal portable moisture meter via special USB type connector, turn the meter on and press the button

to read current air temperature ( ), i.e., press the button to read current air humidity ( ).
It is required to wait at least 1 minute before initial measurement in order to allow the sensor inside the probe to
adopt to ambient conditions (if it was previously stored on significantly different temperature or humidity). Also,
for more accurate measurement, if hole measurement set is taken from cold into warm room, it should be left
for short time (several minutes) to adopt, and then proceed with measurement.

During temperature and humidity measurement inside the dryer, probe body should be placed inside the
chamber, while part of cable with connector and portable meter is held outside of it. This is precaution
measure to avoid damaging the meter if operating conditions are exceeded. Measurement should be
performed after sensor is adopted to ambient conditions inside the chamber (few minutes).

DSVT-03

DSVT-03

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o

in C in %

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