Doser DM 4 A Manuale utente

Feuchtigkeitsmessgeräte Moisture Meter

Humidimètre

Moisture Meter type DM4A for wood building

materials, paper and cardboard

Description:

The electronic moisture meter DM4A is used to determine in a matter of seconds the moisture in materials. The

average moisture, down to a depth of approx. 3 cm is measured.

materials: wood, building materials, paper and cardboard

Measuring Ranges:

wood: 0,0 -99,9 % H O2

building materials: 0,0 -20,0 % H O2

paper and cardboard: 0,0 -50,0 % H O2

material temperature range: 5 -40°C

working temperature range: 5 -40°C

storage temperature range: -20 -70°C

Method of Operation:

The measuring electrodes  of the meter are pushed during the measuring process on the material to be

measured ‚ so that a high frequency electrical field is able to pass through the material. A micro processor

receives the measured signals and determines from the measured value the percentage water content taking into

account the material setting group.

Measuring Principle:

The meter works in accordance with the principle of an opened plate capacitor. The capacity of the capacitor

depends on the material-(dielectric)-constant of the material in between the plates. Compared with air (r » 1) , for

example water has a very high dielectric-constant (e » 80). The water content of a wet material can therefore be

determined

by determining the dielectric constant of this material.

Safety Tips:

 follow the operating instructions

 only use the meter as directed (see page 1)

. keep the meter away from live and current carrying parts

. avoid impacts

. protect the meter from heat

. keep the meter dry and try to prevent dirt from entering the case

. protect the meter from electrostatic discharge.

. the meter must be repaired or serviced only by qualified specialists

Damages caused by failure to follow the above Safety Tips are not covered by the warranty !

Measurement Preparation:

. material thicknesses<5cm ‚: use suitable bases �(for example: polystyrene or foamed plastic plates

-no metal!) or even better: hold the material to be measured into the air

. thin materials (< 2 cm) ‚: measure on a pile (thickness at least 2 cm, avoid air gaps between the

individual layers)

. look for an even, smooth surface ƒ (minimum size for the measurement 10x10cm)

. minimum distance of the electrodes

from the edge of the surface: 1 cm

Turn on the Meter:

. Push ON/OFF-button, the display shows the adjusted material group. Hold the instrument into the

air for automatic zero point measurement and correction, if the zero point is not in the valid range, the display shows

“NP-ERROR”.

. release the ON/OFF-button, the dislpay shows e.g. "A1: 0,00%" , the instrument is now ready for

use (the first two characters shows always the adjusted material group and number).

Parameter Settings:

With code numbers parameter settings can be changed. Press both arrow buttons, the display shows “code:00“,

adjust the required code with the arrow buttons and confirm it with OK. The following parameters are changeable:

code 11: storage adjustments (OFF, ON single, ON auto)

ON single: single values will be stored by pressing the OK-button ON auto: All values > 0 will be

stored automatically after pressing Ok till the storage is filled up or till the OK-button is pressed again.

code 12: number of measurements per second (mps) range0-10 code 13: number of

measurements till automatic switching off (loops) range 0 -999, loops = 0:

no automatic swiching off code 14: delete storage, through changing the

material setting the

storage will be deleted too. code 21: attenuation ( brake), range0-99 code 22: automatic maximum

value measurinhg (automax)

no automatic maximum measurement (float)

Material Groups:

For using the required stored material group the corresponding code

has to be selected (the sign is always displayed as the first character):

code 30: sign S, customer specific curves

code 31: sign H, wood (HD5)

code 32: sign P, paper and cardboard (PD2)

code 33: sign A, wood (BD2)

code 34: sign B, building materials (BD2)

the selected group is always displayed during the measurements

Additional adjustments can be made with the optional PC-Software DMI-Controller

Checking Measuring Quality:

We recommend carrying out regular periodical controlling check measurements, as different local circumstances

might need different material adjustments. (recommendation: controlling measurements by oven

Screed Moisture Measuring:

For accurate determination of moisture in different kind of screed we reccomend the instrument G812 together

with the test module PE05. On intrest, please contact:

DNS-Denzel Natursteinschutz GmbH • Am Wasserturm 5 • 73104 Börtlingen; Germany Tel: +49 (0) 7161 959

336 • Fax: +49 (0) 7161 959 337 • [email protected] • www.dns-denzel.de The DM4A can be used for

measuring moisture differences

1. 1. the measurements are non damaging

2. 2. the measurements are very quickly done

3. 3. if the measured values are too high time sensitive exact measurements e.g. the oven drying

method, are superfluous.

Even in one room great differences of the moisture in the fooring are possible. Therefore non damaging

measurements are necessary to find out the critical places for an exact time sensitive measurement as e.g. the

oven drying method.

The number of such damaging measurements are then minimised.

The result of our capacitive moisture meter depends on differences in density, mixtures and surface roughness. It

depends also from the moisture profile. The influence to the moisture gets smaller for higher depth. The measuring

result is an average moisture value.

With our moisture meter it’s possible to observe the drying process. If at the same place after several days the

moisture result does not change, the moisture is in balance with the air humidity. In this case also at high

moisture readings an exact comparing measurement e.g. with the oven drying method is recommended.

Oven Drying Method:

The oven drying method is the most acurate way to measure the material moisture in

wood (ISO 3130-1975), building materials and paper (DIN ISO 287).

We recommend this for testing and calibrating of all electronic moisture meters.

Short description:

1. 1. For measuring the weights we recommend a balance with an measuring range of 200g and an

accuracy of 0,01g

2. 2. For drying you need an oven with adjustable temperatures of 40, 100 and 104°C

3. 3. Take a probe from wood with a sharp saw, avoid edge parts. For building materials take a probe

with a with a sharp chisel to a depth of approx 3cm. the probe should be at least 20g

4. 4. It is very important to take the weight of the first probe immediately, as air humidity may change

the moisture content. Name of the first weight: wet weight (WW)

5. 5. The probe must be dryed in the oven until the weight is constant. The maximum drying

temperatures: for wood: 104 °C (ISO 3130-1975) for paper 100°C (DIN ISO 287) for e.g. concrete flooring:100 °C

for anhydride flooring: 40°C

6. 7. The name of the dry weight is DW.

7. 8. The moisture content is calculated with the formulas:

Customer Specific Linearisation Curves:

It can be programmed up to 10 customer specific linearisation curves. Each curve is programmable with up to 8

points. The curves are stored in a EEPROM, the curves will not get lost through changing of the battery: For

changing the linearisation curves you need the PC interface cable and the software DMI-Controller.. The customer

specific curves can be selected with code 30. The material group is the “spec. curves”.

Basic Calibration:

The moisture meter can be tested andcalibrated with two test modules.

material group test module rated value

BD2 (A0) PE05 37±2%

BD2 (B0) PE05 10±1%

HD5 (H0) PE30 12±1%

PD2 (P0) PE30 8,5 ± 0,5%

For changing the calibration you need the PC interface cable and the software DMI-Controller.

Special Usings, Recommendation

Measuring moisture in caravans, trailers, moble homes

For this using we are producing instrumenst with shorted sensors as showed in the picture nearby.

With such sensors measurements can be made in edges without being influeced through the adjoined

wall.

We recommend the material settoing HD5(H) (code 31)

measurement:

1. 1. make a reference measurement at a dry place

2. 2. change the material setting til the instrument shows approx. 5%

3. 3. now different similar places can be checked for higher moisture content.

Attention:

Frames may also causes higher moisture readings. Therefore the instrument also can be used

to detect frames.

Moisture measurement in plastic boates:

Caused through Osmose plastic boates can get blisters below the water line. At thsi blistes the moisture in the

plastic rises up. Befor starting a repair such parts must be completely dry. To measure this we recommend to

select the wood material group, material no. 0. The surface of the place where you need to measure must be dry!

Measurement:

1. 1. take a reference measurement above the water line

2. 2. select the material no. till the reading is approx 10%

3. 3. now you can measure at similar places to see the moisture

differences.

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