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13
Always replace all the batteries at the same time. Only use
batteries from the same manufacturer and which have the
same capacity.
u
Take the batteries out of the measuring tool when you
are not using it for a prolonged period of time
. The bat-
teries can corrode and self-discharge during prolonged
storage.
Operation
Starting operation
u
Protect the measuring tool from moisture and direct
sunlight.
u
Do not expose the measuring tool to any extreme tem-
peratures or variations in temperature.
For example,
do not leave it in a car for extended periods of time. In
case of large variations in temperature, allow the measur-
ing tool to adjust to the ambient temperature before put-
ting it into operation. The precision of the measuring tool
may be compromised if exposed to extreme temperat-
ures or variations in temperature.
u
Make sure that the measuring tool is correctly accli-
matised.
In case of large variations in temperature, accli-
matisation can take up to
30
minutes. This may be the
case, for example, if you store the measuring tool in a cool
car and then perform a measurement in a warm building.
u
Avoid hard knocks to the measuring tool or dropping
it.
After severe external influences and in the event of ab-
normalities in the functionality, you should have the
measuring tool checked by an authorised
Bosch
after-
sales service agent.
u
Do not close or cover the humidity and temperature
sensor
(1), the reception lens
(2) or the laser outlet
aperture
(3).
Switching on/off
The following options are available for
switching on
the
measuring tool:
– Switch on the measuring tool using the
on/off
button
(13)
. After a short start sequence, the measuring
tool is ready to use with the settings (operating mode,
emissivity) that were saved when the tool was last
switched off. No measurement is initiated at this stage
and the laser is still switched off.
– Switch on the measuring tool using the
measuring
button
(4)
. After a short start sequence, the laser is
switched on and the measuring tool initiates a measure-
ment straight away, using the settings (operating mode,
emissivity) that were saved when the tool was last
switched off.
u
Never leave the measuring tool unattended when
switched on, and ensure the measuring tool is
switched off after use.
Others may be dazzled by the
laser beam.
u
Do not direct the laser beam at persons or animals and
do not stare into the laser beam yourself (even from a
distance).
The brightness of the display lighting is reduced 30 seconds
after a button is pressed to save energy. Pressing any button
will switch the display lighting back to full strength.
To
switch off
the measuring tool, press the on/off
button
(13)
.
If no button on the measuring tool is pressed for approx.
4
minutes, the measuring tool will automatically switch off to
preserve battery life.
Measurement preparations
Emissivity for surface temperature measurements
To determine the surface temperature, the tool performs a
contactless measurement of the natural infrared thermal ra-
diation emitted by the object at which the tool is aimed. To
ensure correct measurement, the emissivity setting on the
measuring tool must be checked
before every measure-
ment
and adapted to the measuring object if necessary.
You can select from three different emissivity groups on the
measuring tool. The commonly used materials listed in the
following table are a selection of examples from the emissiv-
ity group to be used.
High emissivity group:
Concrete (dry), brick-
work (red, rough), sandstone (rough),
marble, roofing felt, stucco (rough), mortar,
gypsum, parquet flooring (matt), laminate,
PVC, carpet, wallpaper (patterned), tiling
(matt), glass, aluminium (anodised), enamel,
wood, rubber, ice
Medium emissivity group:
Granite, paving
stones, fibreboard, wallpaper (slightly pat-
terned), paint (dark), metal (matt), ceramics,
leather
Low emissivity group:
Porcelain (white),
paint (bright), cork, cotton
The following emissivity gradings are specified for the selec-
ted examples:
– High emissivity grading: Approx. 0.95
– Medium emissivity grading: Approx. 0.85
– Low emissivity grading: Approx. 0.75
To change the emissivity group, press the emissivity
button
(14)
repeatedly until the indicator
(g)
shows the re-
quired emissivity for the next measurement.
u
Temperature measurements will only be correct if the
emissivity setting matches the emissivity of the ob-
ject.
Otherwise, object temperatures could be shown to
be hotter or colder than they are, which may present a
danger if touched.
Measuring surface for surface temperature
measurements
The laser circle produced by the measuring tool indicates the
measuring surface. The infrared radiation of this measuring
surface is then determined when performing a contactless
surface temperature measurement.
Bosch Power Tools
1 609 92A 4NX | (20.04.2021)
