PCE Instruments PCE- WP21 Manual de usuario

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PCE- Deutschland Gmb H & Co. KG

Tel: +49 029 03 976 99-0

Fax: +49 029 03 976 99-29

[email protected]

www.warensortiment.de

PCE Group Ibérica S.L.

Tel: +34 967 543 548

Fax: +34 967 543 542

[email protected]

www.pce-iberica.es

PCE Group Italia S.R.L.

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Fax: +39 0583 974 824

[email protected]t

www.pce-italia.it

USER MANUAL

PCE- WP21

Contents:

1. Application.................................................................................................................3

2. Technical data...........................................................................................................3

3. Description of the controls.........................................................................................3

4. Preparing the instrument...........................................................................................4

5. Measurements...........................................................................................................5

6. Remarks....................................................................................................................5

7. Density of selected wood types.................................................................................6

8. Calculating wood density...........................................................................................8

9. Errors ........................................................................................................................9

10. Changing the battery.................................................................................................9

1. Application

Wood Moisture Meter WIP-22D is designed for quick and non damaging measurement

of moisture contents in wood. The device measures the dielectric constant (SIC) of the

material. The wood is penetrated by the electromagnetic field generated by the device.

The Moisture Meter is equipped with knobs for setting the density and thickness of the

wood. It can be used to measure wood planks 10 mm to

60 mm thick and of density within the range of 0.3 to 1.1 g/cm³. The measuring range is

4% to 60% of moisture contents.

2. Technical data

Range 4% - 60%

Max. depth of penetration 60 mm

Display LCD, 12.7 mm

Resolution 0.1

Settings range:

density 0.3 – 1.1 g/cm³

thickness 10 – 60 mm

Minimal settings’ step:

density 0.02 g/cm³

thickness 2 mm

Power battery 6F22, 9V

Battery life approx. 5000 meas.

Low power indication yes

Size

device 165 * 80 * 33 mm

case 270 * 180 * 55 mm

3. Description of the controls

There are two control knobs on the front panel:

upper – to select the operating function,

OFF – power off.

DENSITY – setting the density with the lower knob.

THICKNESS – setting the thickness with the lower knob.

SETTINGS CHECK – alternately displaying the previously set density and thickness.

MEASURE – automatic calibration (approx. 4 sec.) and measurement.

lower –to set the density and thickness of the wood. This knob is active when the

upper knob is set to DENSITY or THICKNESS.

4. Preparing the instrument

a) Preparing the instrument without the change in settings

In this case quickly switch the upper control to SETTINGS CHECK. The LCD

will display the density and thickness set during the previous measurements (e.g. 0.56

and 42). Hold the device in the air (fig. 1), switch the upper control knob to MEASURE.

The device will calibrate automatically (the display shows - - -). The end of

calibration is indicated by the number 4.0 (the lower range limit) displayed on the LCD.

The device is ready for measurements.

Fig. 1

b) Preparing the instrument and changing the settings

Follow these steps:



set the upper control knob to DENSITY and then set the required density using the

lower control knob,



set the upper control knob to THICKNESS and set the required thickness with the

lower control knob,



set the upper control knob to SETTINGS CHECK. The LCD will display the density

and thickness alternately,



hold the instrument in the air (fig. 1) and set the upper control knob to MEASURE. The

device will calibrate automatically (the display shows - - -).

The end of calibration is indicated by the number

4.0 (the lower range limit) displayed on the LCD. The device is ready for

measurements.

A table with the density values for the most popular wood types is on the back of the

moisture meter.

Density values for other (also exotic) wood types are in chapter 7 of the users manual.

5. Measurements

The measurements should be conducted in at least several places. These places

should be as flat, smooth and clean as possible. The actual result of the measurements is

the arithmetic average of all the measurements. A line drawn between the electrodes

should be perpendicular to the fibres. If the timber is too thin, place the electrodes

parallel to the fibres.

Hold the device as shown on fig 2. Press the electrodes hard against the wood. Read the

result.

There should not be any metal elements, wet wood or concrete etc under the timber.

It’s best if the timber is

supported only by it’s ends or placed on a layer of

Styrofoam several centimetres thick.

The instrument is equipped with an automatic power off which activates 5 minutes

after the last change in upper

control knob setting. It can be switched off instantly by

setting the upper control knob to OFF.

Fig. 2

6. Remarks

The size of the timber should not be less than 80 x 40 mm. Measuring moisture

contents of smaller pieces leads to results lower than the real moisture contents.

The electrodes are made of special silicon bronze and during normal operation should

not get deformed. If due to excess force or accidental fall the electrodes get deformed, they

should be bend to their original shape. Deformed or misplaced electrodes are the source

of errors and in extreme cases can prevent proper calibration of the device.

Avoid measurements when the timber or the operator of the device are loaded with

high electrostatic charges. Such charges (sparks) make measurements difficult and can

damage the instrument.

Wood type(brand name) Density

(g/cm

)

Abacji 0,35

Abura 0,53

Afara white 0,52

Afrormosia 0,65

Alder, Blackalder 0,51

Alerce 0,34

Ash common 0,65

Ash japanese 0,61

Ash white 0,64

Aspen, Poplar 0,45

Balsa 0,08

Basswood, Lime 0,49

Beech 0,68

Birch common 0,61

7. Density of selected wood types

Californian Redwood 0,39

Mountain Cherry 0,54

Chestnut, Sweet 0,55

Douglas Fir, Oregon 0,47

Eberesche 0,73

Ebony Macassar 1

Elm 0,64

European Cherry 0,55

Spruce European 0,43

Hickory, White heart 0,76

Hornbeam common 0,79

Iroko 0,63

Larch European 0,55

Larch japanese 0,49

Lauan White 0,52

Locust black 0,74

Mahogany Broad 0,55

Mahogany Grand, Bassam 0,47

Mansonia 0,6

Maple 0,59

Maple 0,58

Maple sugar 0,63

Maple soft 0,47

Meranti dark red 0,67

Meranti White 0,82

Merbau 0,77

Niangon, Wishma 0,6

Oak, European 0,65

Oak, White 0,74

Okoume, Gaboon 0,41

Pear 0,7

Pine insignis 0,4

Pine, Weymouth 0,37

Pine, Europ. Black 0,53

Pine, Redwood 0,49

Popular Black Populus nigra 0,41

Ramin 0,56

Rubberwood 0,49

Redoak, Northern 0,66

Sapele 0,62

Silver Fir 0,41

SpruceW.H. Alaska pine, 0,44

Teak 0,63

Utile 0,59

Walnut 0,64

8. Calculating wood density

Calculating the density of a wood type can be necessary when the wood type is

not in the table in chapter

7 or when it is suspected that the local wood has the density considerably different from the

average for this type.

Follow these steps to calculate the density of the wood type:

a) cut a regular cube of the wood and measure it’s size with the accuracy of 1 mm

(e.g. 46 * 64 * 32) mm; calculate it’s volume (in cm

)

V = a * b * h (e.g. 94.2 cm

)

b) weight the cube with the accuracy of 1 gram; note the result G in grams (e.g. 62g)

c) measure the approximate moisture contents with Wood

Moisture Meter WIP-22D setting:



thickness –according to h,



density – based on your expertise or tables

Note the result W % (e.g. 17.2%)

d) calculate the density with the following formula:

G 100

g = x

V 100 + W

where:

G – weight of the sample (g)

V – volume of the sample (cm

)

W – moisture contents (%)

g – density (g/cm

)

For the example values given in a, b and c the result is:

62 100

g = x = 0.56

94.2 100 + 17.2

e) now you can use the calculated density (e.g. 0.56) for any future measurements of this

type of timber.

9. Errors

If the instrument can not calibrate properly it indicates the following error:

-AIr - generator voltage too low

AIr - generator voltage too high

In such case power off the device, check the geometry of the electrodes, clean the

electrodes, make sure the device is dry and then start the calibration again (see chapter 4).

If the instrument still reports error contact the producer.

10. Changing the battery

The device is equipped with a power level control circuit. When the power drops

below acceptable level a sign ”LO BAT” appears on the left side of the LCD. This

indicates that the battery has expired and should be replaced with a new one.

To replace the battery unscrew the screw on the back of the instrument and carefully

remove the back panel.

Store the device in a dry place.

In this direction will find a vision of the measurement technique:

http://www.industrial-needs.com/measuring-instruments.htm

NOTE: "This instrument doesn’t have ATEX protection, so it should not be used in potentially explosive

atmospheres (powder, flammable gases)."

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