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Bosch Power Tools 2 609 140 909 | (5.7.12)
f Remove the batteries/rechargeable batteries from the
measuring tool when not using it for longer periods.
When storing for longer periods, the batteries/rechargea-
ble batteries can corrode and discharge themselves.
Operation
Initial Operation
f Protect the measuring tool against moisture and direct
sun light.
f Do not subject the measuring tool to extreme tempera-
tures or variations in temperature. As an example, do
not leave it in vehicles for long time. In case of large varia-
tions in temperature, allow the measuring tool to adjust to
the ambient temperature before putting it into operation.
In case of extreme temperatures or variations in tempera-
ture, the accuracy of the measuring tool can be impaired.
f Avoid heavy impact to or falling down of the measuring
tool.
f Do not shut or cover off the humidity and temperature
sensor 1, the reception lens 2 and the laser beam exit
opening 3.
Switching On and Off
For switching on the measuring tool, the following possibili-
ties are given:
– Switch the measuring tool on with the On/Off button 13.
After a short start-up sequence, the measuring tool is
ready for operation with the settings (operating mode,
emission degree) saved after switching off last. A meas-
urement is not started as yet and the laser is switched off.
– Switch the measuring tool on with the measuring button
4. After a short start-up sequence, the laser is switched on
and the measuring tool immediately starts a measurement
with the settings (operating mode, emission degree)
saved after switching off last.
f Do not point the laser beam at persons or animals and
do not look into the laser beam yourself, not even from
a large distance.
To save energy, the brightness of the display illumination is
reduced 30 seconds each time after pressing a button. After
pressing any button, the display illumination is switched on
again at full brightness.
To switch the measuring tool off, press the On/Off button 13.
When no button on the measuring tool is pressed for approx.
4 minutes, the measuring tool automatically switches off to
save the batteries.
Preparing for Measurement
Setting the Emissivity Degree for Surface-temperature
Measurements
To determine the surface temperature, the natural infrared
heat radiation emitted by the object is measured contact-
free. For correct measurements, the emissivity degree set on
the measuring tool (see “Emissivity Degree”, page 15) must
be checked and if required, adapted to the object being meas-
ured prior to each measurement.
You can select between three emissivity degrees. The com-
monly used materials specified in the Table below are exem-
plary for selection of the emissivity degree to be used.
To change the emissivity degree, press the emissivity degree
button 14 until the appropriate emissivity degree for the next
measurement is indicated in display element g.
f Correct surface-temperature indications are only pos-
sible when the set emissivity degree and the emissivity
degree of the object correspond. Correct notes on ther-
mal bridges and the risk of mould thus also depend on the
set emissivity degree.
Measuring Surface for Surface-temperature Measure-
ments
The laser circle generated by the measuring tool indicates the
measuring surface; its infrared radiation is determined in the
course of the contact-free surface-temperature measurement.
The centre laser point marks the centre of the measuring sur-
face. For optimal measuring results, align the measuring tool
in such a manner that the laser beam impinges perpendicular-
ly on this point of the measuring surface.
f Do not point the laser beam at persons or animals and
do not look into the laser beam yourself, not even from
a large distance.
The size of the laser circle and thus of the measuring surface
increases with the clearance between the measuring tool and
the object being measured. The optimal measuring distance
is 0.5 m to 1 m.
f Do not hold the measuring tool directly against hot sur-
faces. The measuring tool can be damaged through heat.
The indicated measuring result is the mean value of the meas-
ured temperatures within the measuring surface.
Notes on the Measuring Conditions
Highly reflecting or transparent surfaces (e.g., shiny tiles,
stainless steel fronts or cooking pots) can affect the surface-
temperature measurement. If necessary, mask off the meas-
uring surface with a dark, matt tape that conducts heat well.
Allow the tape to briefly acclimatize to the surface.
On condition of the principle, taking measurements through
transparent materials is not possible.
High emissivity degree: Concrete (dry), bricks
(red, course), sandstone (course), marble, roof-
ing felt, stucco (course), mortar, gypsum, parquet
flooring (matt), flooring panels, PVC, carpet, wall-
paper (patterned), tiles (matt), glass, aluminium
(anodised), enamel, wood, rubber, ice
Medium emissivity degree: Granite, paving
stone, fibre board, wallpaper (lightly patterned),
varnish (dark), metal (matt), ceramic, leather
Low emissivity degree: Porcelain (white),
varnish (light), cork, cotton
For the selected examples, an emissivity degree is indicated as follows:
– High emissivity degree: 0.95
– Medium emissivity degree: 0.85
– Low emissivity degree: 0.75
OBJ_BUCH-1625-001.book Page 13 Thursday, July 5, 2012 8:56 AM
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