DOSER Messtechnik DM7 User manual

Feuchtigkeitsmessgeräte
Moisture Meter
Humidimètre
page 1version 2011
Moisture Meter type DM7 for
veneers, corrugated boards, sigle card boards,
cardboard pipes etc.
DM7 Operating Instructions

Moisture Meter Type DM7
Method of Operation:
The measuring electrodes 1 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.
page 2
3
2
1
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 (e = 1) , for example water has a very high dielectric-constant (e = 80).
rr
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 electrical 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 !
Description:
The electronic moisture meter DM7 is used to determine in a matter of
seconds the moisture in materials. The average moisture, down to a depth of
approx. 1 cm is measured.
materials: veneers, plywood, corrugated boards, single cardboards,
cardboard pipes
measuring ranges:
wood: 0,0 - 99,9 % H O
2
building materials: 0,0 - 20,0 % H O
2
paper and cardboard: 0,0 - 50,0 % H O
2
material temperature range: 5 - 40°C
working temperature range: 5 - 40°C
storage temperature range: -20 - 70°C
•field lines
‚material to be measured
ƒplate capacitor
DM4ADM4A
A2: 6.4%A2: 6.4%
MODEMODE
OKOK
ON
OFF
ON
OFF
1
2

page 3
Measurement Preparation:
- material thicknesses < 3 cm ‚: 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 (< 1 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
4 x 10 cm)
- minimum distance of the electrodes
from the edge of the surface: 1 cm
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 until the storage is filled up or until the OK-button
is pressed again.
code 12: number of measurements per second (mps)
range 0 - 10
code 13: number of measurements until 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), range 0 - 99
code 22: automatic maximum value measuring (automax)
no automatic maximum measurement (float)
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 always shows
the adjusted material group and number).
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
the selected group is always displayed during the measurements
Moisture Meter Type DM7
Additional adjustments can be made with the optional
PC-Software DMI-Controller
DM7DM7
code: 00code: 00
MODEMODE
OKOK
ON
OFF
ON
OFF
DM7 DM7
onon S1: 0.0%S1: 0.0%
MATMAT MATMAT
OKOK OKOK
ON
OFF
ON
OFF
ON
OFF
ON
OFF
DM7 DM7
code 030code 030 SPEZIALSPEZIAL
MODEMODE MODEMODE
OKOK OKOK
ON
OFF
ON
OFF
ON
OFF
ON
OFF
1
2
3

page 4
Material Moisture Measuring:
- press the meter on the material, if “automax” is activated, the maximum
value is taken automatically and
.
if the meter is pushed again with the
sensors to a material, a new measurement starts.
- read off the moisture
Setting of Material number:
With the MODE-button the required material number can be selected. The
display shows S1 if the material setting S1 was selected before. The
material number can be changed with the arrow buttons. At the material
groups A and B it’s possible to switch between wood to building materials
by pushing the MODE button. The change has to be confirmed with OK.
The material number is shown as the second character in the display.
Turn off the Meter:
After an adjustable number of measurements (loops) the instrument
switchs off automatically. If loops is adjusted to 0, the automatic turning off
is deactivated. In this case the instrument has to be turned off by pushing
the ON/OFF-button
- push "ON/OFF" button until the display shows “OFF”
- release "ON/OFF" button, the meter is turned off
Storing of Moisture Values:
If the storage is activated, by pushing the OK-button up to 100 values can
be stored. If the storage parameter is set to “on single” always one value is
stored, if the parameter is set to “on auto” every value > 0 is stored
automatically until the storage is full or the OK button is pressed again. The
number of measurements per second (mps) can be adjusted between 1
and 10. The storage procedure will be signed with an “S” at the end of the
display instead of the %-sign.
The stored values will be kept also during switching off position.
Restorage of the Stored Values:
By pushing the "OK" and the “â” button, the stored values can be restored
with the arrow buttons. The first two signs always shows the storage place:
MA: 8.7% highest value
AV: 4.5% average value
MI: 9.6% lowest value
01: 5,2% 1. stored value
·
·
·
100: 7,3% 100. stored value
With our optional PC-interface cable and software DMI-Controller the stored
values can be transfered to a PC for storing them into a file or showing them
on a graph.
Cancellation of the Stored Values:
After changing the material adjustment or with code 14, the stored values
will be cancelled, which is shown as “DELETE” on the display.
Moisture Meter Type DM7
1
2
Ser. Nr.Ser. Nr.
009871009871
made in germany
DM4ADM4A
A1A1
MODEMODE
OKOK
ON
OFF
ON
OFF
DM7DM7
OFFOFF
MODEMODE
OKOK
ON
OFF
ON
OFF
DM7DM7
S2: 6.5SS2: 6.5S
MATMAT
OKOK
ON
OFF
ON
OFF
DM7
AV: 6.5%AV: 6.5%
MODEMODE
OKOK
ON
OFF
ON
OFF
DM4A DM4A
code 014code 014 DELETEDELETE
MODEMODE MODEMODE
OKOK OKOK
ON
OFF
ON
OFF
ON
OFF
ON
OFF

page 5
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 drying method
ISO 3130-1975 for wood or DIN ISO 287 for paper)
Screed Moisture Measuring:
For accurate determination of moisture in different kind of screed we reccomend the instrument G812 together with
the test module PE05. For further information, please contact:
DNS-Denzel Natursteinschutz GmbH Am Wasserturm 5 73104 Börtlingen; Germany
Tel: [phone] Fax: [phone] [email protected] www.dns-denzel.de
The DM4A can be used for measuring moisture differences:
1. the measurements are non damaging
2. the measurements are very quickly done
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 is 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. For measuring the weights we recommend a balance with an measuring range of 200g and an accuracy of 0,01g
2. For drying you need an oven with adjustable temperatures of 40, 100 and 104°C
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. 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. 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
7. The name of the dry weight is DW.
8. The moisture content is calculated with the formulas:
••
•••
MOISTURE =
(WW - DW)
DW * 100 %
wood moistue (ISO 3130-1975):
MOISTURE =
(WW - DW)
WW * 100 %
building materials and paper:
Moisture Meter Type DM7

page 6
Moisture Meter Type DM7
Customer Specific Linearisation Curves:
The meter can be programmed for 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 stay in the memory during replacement 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”.
material group
SPECIAL (S0)
test module
PE30-7
rated value
10,5 ± 0,5%
DM7DM7
N016 015N016 015
MODEMODE
OKOK
ON
OFF
ON
OFF
DM7DM7
CAL1HIGHCAL1HIGH
MODEMODE
OKOK
ON
OFF
ON
OFF
DM7DM7
176 0189176 0189
MODEMODE
OKOK
ON
OFF
ON
OFF
DM7DM7
CAL1LOWCAL1LOW
MODEMODE
OKOK
ON
OFF
ON
OFF
Calibration:
The moisture meter can be tested and calibrated with the
test module PE30-7.
For calibration use code no. 97,
in the display the text “NPW UF” is shown shortly
1.test of zero point: the display shows e.g. “N16 15”, than the zero point is
16 and the actual measuring value is 15. For testing hold the instrument
free into the air, wait till the two values are equal. The zeropint must be <
50! The optimum value is between 20 and 30. Press “OK” for the next
calibration step.
2. first measurement on PE30-7:
the display shows shortly “CAL1HIGH”, then e.g. “176 0189”, the first
value is the calibration factor, the second is the measuring value. Change
with the arrow buttons till the measuring value is 210±5 and press “OK”
3.second measurement on PE30-7:
the display shows shortly “CAL1LOW”, the rated value is 210±10
4.first measurement on PE30-7:
the display shows shortly “CAL2HIGH”, the rated value is 210±5
5.first measurement on PE30-7:
the display shows shortly “CAL2LOW”, the rated value is 210±10
The calibration factors can be changed in the range between 150 and 255
By pressing the “OK”-button in the 5th step, the changed calibration factors
will be stored. The instrument is then ready calibrated.
If the calibration is not able, please send the instrument for repair. .
Alternatively the calibration can be done with the PC and the software
DMI-Controller. Important: through the connection cable the measurement
value can be influenced a little!
Test meausurement on PE30-7:

page 7
Moisture Meter Type DM7
Moisture measurement in plastic boats:
Caused through Osmose plastic boats can get blisters below the water
line. At this blisters the moisture in the plastic rises up. Before starting a
repair such parts must be completely dry. To measure this we
recommend you select the wood material group, material no. 0. The
surface of the place where you need to measure must be dry!
Measurement:
1. take a reference measurement above the water line
2. select the material no. until the reading is approx 10%
3. now you can measure at similar places to see the moisture
differences.
Attention: Frames or moutings may also causes higher moisture
readings. Therefore the moisture meter also can be used to detect
frames or mountings at the opposite side of the wall.
Special Usings, Recommendation
Measuring moisture in caravans, trailers, mobile homes
For these applications we produce instruments with shortened sensors
as shown in the picture opposite. With such sensors measurements can
be made in edges without being influenced through the adjoined wall.
We recommend the material setting HD5(H) (code 31)
measurement:
1. make a reference measurement at a dry place
2. change the material setting until the instrument shows approx. 5%
3. now different similar places can be checked for higher moisture
content.
Attention:
Frames may also cause higher moisture readings. Therefore the
instrument can also be used to detect frames.

Our operating instructions are intended for guidance and to provide information on our products and their uses.
They should not be taken to imply special characteristics or suitability for any specific purpose, other than those
stated.
We constantly work to improve our products and reserve the right to alter our products and operating instructions
without advanced notification.
Moisture Meter Type DM7
Battery:
we absolutely recommend the lithium battery type U9VL. The using time is
10 times more than the alkaline one. The lithium battery is allowed to stay
up to 10 years in the instrument, without the fear for running out.
Also the self descharging is neglectable.
If the battery is running low, the display shows “B” instead of the % in final
position.
Change battery:
- open the battery box for example with a small screw driver
- take out the battery
- insert new battery type 9V-Block alkaline, observing the correct polarity
Attention!
In accordance with battery legislation, all used batteries must be
disposed off in special battery collecting bins.
The disposal of old or used batteries as part of normal waste is not
allowed!
Ser. Nr.Ser. Nr.
009871009871
made in germanymade in germany
DM4ADM4A
A1: 7.5BA1: 7.5B
MODEMODE
OKOK
ON
OFF
ON
OFF
Optional Extras:
- test module PE30-7 for checking and calibrating the moisture meter
- plastic case for better protection
- different types of moisture meters
- special calibration of the moisture meter
- interface cable and PC software DMI-Controller
- alkaline battery 9V block
DOSER MESSTECHNIK GmbH & Co.KG - Kemptener Str. 73 - 87629 Füssen - Germany
Tel:[phone] - Fax:[phone] - [email protected] - www.doser.de