English | 15
Bosch Power Tools 2 609 140 909 | (5.7.12)
ture in line a, the calculated dew point temperature in line c
and the measured surface temperature in line l.
The measuring tool automatically compares the values and in-
terprets the results as follows:
– Green signal LED 8: No risk of mould under the current
conditions.
– Yellow signal LED 8: The values are in the limit range; pay
attention to room temperature, humidity and heat bridges,
and repeat the measurement at a later point of time as re-
quired.
– Red signal LED 8: There is an increased risk of mould, as
the dew point temperature is significantly higher than the
surface temperature, or because the humidity is too high.
The flashing symbol for relative humidity d indicates too
high humidity in the room,
the flashing symbol for ambient temperature e indicates
too low room temperature,
the flashing symbol for surface temperature h indicates
thermal bridges.
When the risk of mould is given, you should – depending on the
cause – reduce the humidity through more frequent and thor-
ough ventilation, increase the room temperature and eliminate
thermal bridges. If required, refer to a building expert.
Note: The measuring tool cannot detect mould spores. It only
indicates the possible formation of mould when the condi-
tions remain the same.
Troubleshooting – Causes and Corrective
Measures
All of the following error messages in the display are accom-
panied by the red signal LED 8.
Measuring Tool not Acclimatized
The measuring tool was exposed
to severe variations in tempera-
ture and did not have enough time
to adapt.
The measuring tool switches off
automatically after 5 seconds.
Wait approx. 10 to 30 minutes
until the measuring tool has adapted to the current tempera-
tures. The acclimatization is accelerated when the measuring
tool is periodically moved around in the room.
Ambient Temperature not in Operating-temperature
Range
The ambient temperature is too
high or too low for operation of the
measuring tool. The measuring
tool switches off after 5 seconds;
taking measurements in this envi-
ronment is not possible.
Surface Temperature not within the Measuring Range
The surface temperature of the object in the laser circle is too
high (“Hi”) or too low (“Lo”). The temperature of this object
cannot be measured. Point the laser circle to another object
and start a new measurement.
Internal Error
The measuring tool has an inter-
nal error and switches off after
5 seconds.
To reset the software, remove the
batteries, wait a few seconds and
then insert the batteries again.
If the error continues, have the measuring tool checked by an
authorised Bosch after-sales service.
Definitions
Emissivity Degree
The emissivity degree of an object depends on the material
and the structure of its surface. It indicates whether an object
(in comparison with other objects with the same tempera-
ture) emits much or little infrared heat radiation.
Thermal Bridge
A thermal bridge is defined as an object that undesirably
transmits heat from one side to the other.
As the surface temperature at thermal bridges is lower than in
the rest of the room, the risk of mould increases significantly
at these locations.
Relative Humidity
The relative humidity provides information on how intensive
the air is saturated with water vapour. It is stated as a percent-
age of the maximum amount of water vapour that the air can
absorb. The maximum amount of water vapour depends on
the temperature: The higher the temperature, the more
amount of water vapour the air can absorb.
When the relative humidity is too high, the risk of mould in-
creases. Too low humidity can lead to health impairments.
Dew Point Temperature
The dew point temperature indicates the temperature at
which the water vapour in the air starts to condense. The dew
point temperature depends on the relative humidity and the
air temperature.
When the temperature of a surface is below the dew point
temperature, water begins to condense on this surface. The
larger the difference of both temperatures and the higher the
relative humidity, the greater the condensation.
Condensate on surfaces is a major cause for the formation of
mould.
Maintenance and Service
Maintenance and Cleaning
Store and transport the measuring tool only in the supplied
protective pouch 16. Do not, as an example, store the meas-
uring tool in a plastic bag, as the evaporation could damage
the humidity and temperature sensor 1. Do not attach stick-
ers onto the measuring tool close to the sensor.
OBJ_BUCH-1625-001.book Page 15 Thursday, July 5, 2012 8:56 AM
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