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BM40
EN
OPERATING MANUAL
MOISTURE MEASURING
DEVICE
TRT-BA-BM40-TC-002-EN
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Table of contents
Safety
Notes regarding the operating manual................................. 1
Safety .....................................................................................1
Information about the device................................................2
Transport and storage...........................................................3
Operation ...............................................................................4
Measuring principle ..............................................................5
Maintenance and repair ........................................................6
Disposal .................................................................................6
Notes regarding the operating manual
Symbols
Warning of electrical voltage
This symbol indicates dangers to the life and health of
persons due to electrical voltage.
Warning
This signal word indicates a hazard with an average
risk level which, if not avoided, can result in serious
injury or death.
Caution
This signal word indicates a hazard with a low risk
level which, if not avoided, can result in minor or
moderate injury.
Note
This signal word indicates important information (e.g.
material damage), but does not indicate hazards.
Info
Information marked with this symbol helps you to carry
out your tasks quickly and safely.
Follow the manual
Information marked with this symbol indicates that the
operating manual must be observed.
You can download the current version of the operating manual
and the EU declaration of conformity via the following link:
Read this manual carefully before starting or using the
device. Always store the manual in the immediate vicinity
of the device or its site of use!
Warning
Read all safety warnings and all instructions.
Failure to follow the warnings and instructions may
result in electric shock, fire and/ or serious injury.
Save all warnings and instructions for future
reference.
This appliance can be used by children aged from
8years and above and persons with reduced physical,
sensory or mental capabilities or lack of experience
and knowledge if they have been given supervision or
instruction concerning use of the appliance in a safe
way and understand the hazards involved.
Children shall not play with the appliance. Cleaning and
user maintenance shall not be made by children
without supervision.
• Do not use the device in potentially explosive rooms.
• Do not use the device in aggressive atmosphere.
• Protect the device from permanent direct sunlight.
• Do not remove any safety signs, stickers or labels from the
device. Keep all safety signs, stickers and labels in legible
condition.
• Do not open the device with a tool.
• Observe the storage and operating conditions as given in
the Technical data chapter.
Intended use
Only use the device for moisture measurements of wood and
building materials within the measuring range specified in the
technical data.
To use the device for its intended use, only use accessories and
spare parts which have been approved by Trotec.
Improper use
Do not use the device in potentially explosive atmospheres, for
measurements in liquids or at live parts. Trotec accepts no
liability for damages resulting from improper use. In such a
case, any warranty claims will be voided. Any unauthorised
modifications, alterations or structural changes to the device are
forbidden.
Personnel qualifications
People who use this device must:
BM40
https://hub.trotec.com/?id=41251
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moisture measuring device BM40
• have read and understood the operating manual, especially
the Safety chapter.
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Residual risks
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BM40
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Warning
Risk of suffocation!
Do not leave the packaging lying around. Children may
use it as a dangerous toy.
Warning
The device is not a toy and does not belong in the
hands of children.
Warning
Dangers can occur at the device when it is used by
untrained people in an unprofessional or improper way!
Observe the personnel qualifications!
Caution
Keep a sufficient distance from heat sources.
Note
To prevent damages to the device, do not expose it to
extreme temperatures, extreme humidity or moisture.
Note
Do not use abrasive cleaners or solvents to clean the
device.
Device depiction
No. Designation
1 Measuring probe
2 Display
3 Power/ MODE button
4 Battery compartment with cover
Display
Information about the device
Device description
The device BM40 is suited for the non-destructive material
moisture measurement in mineral building materials and wood.
The measuring probe is pressed against the material to be
tested. The moisture level is then measured by capacitive
sensors using the dielectric measurement method, which is
absolutely non-destructive since no electrodes or probes have
to be inserted into the material.
For an increased accuracy of the measured values, which are
directly indicated in % by weight, there are 10selectable
material curves available for the most important types of wood
and building materials.
The device further features the following functions:
• Real-time measurement value display
• Temperature measurement
• Automatic switch-off
No. Designation
5 Measuring mode indication
6 °C / °F indication
7 % indication
8 Measurement value indication
9 Battery indication
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moisture measuring device BM40
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Technical data
Transport and storage
Parameter Value
Model BM40
Measuring principle Dielectric/capacitive
Electrode length Approx. 40 mm
Penetration depth, non-destructive 0 mm to 50 mm
Measuring range Solid brick 0 % to 20 %
Anhydrite screed 0 % to 20 %
Cement screed 0 % to 20 %
Sand-lime brick 0 % to 20 %
Gas concrete 0 % to 20 %
High-insulating
0 % to 20 %
brick
Concrete 0 % to 20 %
Hardwood 0 % to 50 %
Softwood 0 % to 50 %
Chipboard 0 % to 50 %
Temperature -10°C to 55°C
Resolution Wood 0.1 %
Mineral building
0.1 %
materials
Temperature 0.1°C
Ambient temperature -5 to 50°C with
0 to 85%RH
Power supply 1 x 9V battery
Automatic switch-off After approx. 10min
Dimensions (length x width x height) 168 x 35 x 75 mm
Weight 220 g
Note
If you store or transport the device improperly, the
device may be damaged.
Note the information regarding transport and storage of
the device.
Transport
For transporting the device use a suitable bag to protect it from
external influences.
Storage
When the device is not being used, observe the following
storage conditions:
• dry and protected from frost and heat
• protected from dust and direct sunlight
• with a cover to protect it from invasive dust if necessary
• The storage temperature is the same as the range given in
the Technical data chapter.
• Remove the batteries from the device.
Scope of delivery
• 1 x Moisture measuring device
• 1 x 9V battery
• 1 x Quick guide
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moisture measuring device BM40
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Operation
+ -
Inserting the battery
Insert the supplied battery into the device before first use.
Note
Make sure that the surface of the device is dry and the
device is switched off.
Selecting the measuring mode
For an increased accuracy of the measured values, which are
directly indicated in % by weight, 10selectable material curves
are available for the following types of wood and building
materials:
Measuring
Designation Measuring range
mode
B1 Solid brick 0 % to 20 %
B2 Anhydrite screed 0 % to 20 %
B3 Cement screed 0 % to 20 %
B4 Sand-lime brick 0 % to 20 %
B5 Gas concrete 0 % to 20 %
B6 High-insulating brick 0 % to 20 %
B7 Concrete 0 % to 20 %
H1 Hardwood (e.g. maple, birch,
0 % to 50 %
beech, Douglas fir, oak, ash,
walnut)
H2 Softwood (e.g. spruce, pine,
0 % to 50 %
cherry, larch, Meranti, poplar)
H3 Chipboard 0 % to 50 %
°C Temperature -10°C to 55°C
1. Open the battery compartment at the rear of the device by
sliding down the cover.
2. Use the battery clip to connect the 9V battery with correct
polarity.
3. Place the battery with the battery clip into the battery
compartment.
4. Slide the cover back onto the battery compartment until it
locks in place.
Switching the device on
Info
Note that moving from a cold area to a warm area can
lead to condensation forming on the device's circuit
board. This physical and unavoidable effect can falsify
the measurement. In this case, the display shows
either no measured values or they are incorrect. Wait a
few minutes until the device has become adjusted to
the changed conditions before carrying out a
measurement.
1. Press the power button(3) for approx. 1s.
ð The device starts in the measuring mode°C.
ð The measured value is displayed in real time on the
measurement value display(8).
1. Repeatedly press the MODE button(3) until the desired
measuring mode is set.
Moisture measurement
Info
When pressing the contact surface of the measuring
probe against the object, apply a steady contact
pressure (approx. 10N which corresponds to approx.
1kg of weight force) but do not bend it to the point of
overlapping.
In order to become a better judge of what the right
level of contact pressure might be, we recommend
pressing the device a few times against a pair of
scales.
1. Use the MODE button(3) to select the desired measuring
mode.
2. Hold the device against the object at an angle of 90° and
make sure that the entire width of the measuring probe
rests on the contact surface.
ð The measured value is displayed in real time on the
measurement value display(8).
Switching the device off
The device switches off automatically after approx. 10min of
non-use.
1. Press the power button(3) for approx. 3s.
ð The device switches off.
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moisture measuring device BM40
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Measuring principle
The measuring device at hand serves for the rough
determination of the material or wood moisture content
according to the dielectric measuring principle. Fields of
application include the non-destructive moisture measurement
of sawn timber, lumber and firewood as well as of mineral
building materials.
The dielectric measuring method is an indirect measurement
method, since the moisture content of the measured material is
deduced from the changed dielectric permittivity.
Influencing variables suitable to change this parameter, e.g.
electrically conducting materials or dissolved salts, hence also
have a direct influence on the determined measured values.
Since the exact composition of building materials is generally
unknown before a moisture measurement, the displayed
measured values can only be regarded as an indicator of the
moisture content.
General notes on use
Calibration curves for measuring the moisture level in different
mineral building materials, hardwood, softwood and chipboard
are stored in the device. If precise material moisture values are
required, an additional control measurement applying the Darr
procedure is recommended. Especially for precise wood
moisture measurements for other wood temperatures or with
due regard to the type and bulk density of a certain timber it is
recommended to use a wood moisture measuring device with
temperature comparison function and selection option for the
specific wood type calibration.
• When selecting the measuring positions observe the
following:
– Always measure the material moisture at three different
positions in order to achieve a sufficient accuracy by
means of the arithmetic average.
– Do not measure the face, because there are mainly dry
areas.
– Preferably do not measure at cracks, branches or resin
pockets either.
Notes on use regarding the material moisture
measurement:
No further settings are required for the quick determination of
the material moisture at the device. Nevertheless, when
assessing the measurement results one has to bear in mind that
the results can be influenced by various factors.
• The measurement's accuracy depends on the contact
pressure of the measuring electrodes. Ideally, they should
be applied with a steady contact pressure of approx. 10N
(this corresponds to approx. 1kg of weight force), however
not bent to the point of overlapping.
• Measuring depth
– Depending on the material's bulk density and degree of
moisture penetration, the device's penetration depth
ranges up to 50mm. Conclusions regarding zones
located at a lower level cannot be drawn.
• Material characteristics
– Increased occurrences of soluble salts in the measured
material can distort the result of the measurement. The
more salts present, the higher the conductivity of the
material and the higher will be the displayed
measurement value.
– If possible, do not measure wood with a temperature
below -5°C. Too low wood temperatures distort the
result of the measurement.
– The material should be preferably homogenous and not
have any air pockets.
• Electrically conducting materials or electrical fields
– If a construction material contains electrically
conducting substances, the dielectric constant is also
increased, which then simulates high moisture values.
Consequently, a too high measured value will be
displayed.
– From visual inspection it is not always apparent,
whether there are any electrically conducting
substances inside the construction material. Some of
the main error sources here are in particular
reinforcements, metal laminations and conducting
insulation such as slag in timber beam ceiling
constructions. Especially in case of insulation materials
with metal lamination, measured values are often
misinterpreted.
– Avoid static charge of the material to be measured due
to friction. Static charge distorts the measurement
result.
– With a wood moisture of less than 10%RH,
electrostatic forces may occur at the good to be
measured. This can falsify the result of the
measurement. Experience has shown that this occurs at
the outlet of veneer drying plants. Remove the static
charge by use of suitable grounding measures.
– For optimum conditions neither electrical fields nor
conducting materials should be present.
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moisture measuring device BM40
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• Surface condition
Li-Ion
– Oily and/or aqueous timber preservatives affect the
measurement result.
– The surface of the material to be measured should be
as level as possible to permit thorough contact of the
measuring probe.
• Moisture distribution
– With material thicknesses of less than 2 cm there is a
danger of humidity values from adjacent material layers
affecting the measured value.
– Ideally, the moisture should be evenly distributed within
the material to be measured.
Quantitative conclusions about the moisture content of the
mineral material to be measured can only be drawn by applying
the Darrprocedure or the CMmethod.
Maintenance and repair
Battery change
A battery change is required when the battery indication(9) is
displayed or the device can no longer be switched on (see
chapter Inserting the battery).
Cleaning
Clean the device with a soft, damp and lint-free cloth. Ensure
that no moisture enters the housing. Do not use any sprays,
solvents, alcohol-based cleaning agents or abrasive cleaners,
but only clean water to moisten the cloth.
Disposal
The icon with the crossed-out waste bin on waste
electrical or electronic equipment stipulates that this equipment
must not be disposed of with the household waste at the end of
its life. You will find collection points for free return of waste
electrical and electronic equipment in your vicinity. The
addresses can be obtained from your municipality or local
administration. For further return options provided by us please
refer to our website www.trotec24.com.
The separate collection of waste electrical and electronic
equipment aims to enable the re-use, recycling and other forms
of recovery of waste equipment as well as to prevent negative
effects for the environment and human health caused by the
disposal of hazardous substances potentially contained in the
equipment.
In the European Union, batteries and accumulators must not be
treated as domestic waste, but must be disposed of
professionally in accordance with Directive 2006/66/EC of the
European Parliament and of the Council of 6September 2006
on batteries and accumulators. Please dispose of batteries and
accumulators according to the relevant legal requirements.
Repair
Do not modify the device or install any spare parts. For repairs
or device testing, contact the manufacturer.
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moisture measuring device BM40
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Trotec GmbH & Co. KG
Grebbener Str. 7
D-52525 Heinsberg
+49 2452 962-400
+49 2452 962-200
info@trotec.com
www.trotec.com
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