Bosch PTD 1 Notice Originale page 15

– Red indicator LED (8): The flashing surface temperat-
ure symbol (h) indicates that the surface temperature of
the measuring surface deviates significantly from the am-
bient temperature. There is a thermal bridge in the meas-
uring area, which is an indication of poor insulation. The
ambient temperature symbol (e) also flashes if the ambi-
ent temperature is low. The room is too cold – if it is being
heated normally, then the low temperature is an indica-
tion of poor insulation overall.
If there are thermal bridges, check the thermal insulation in
this area. If necessary, consult a building expert.
Mould warning mode (see figure C)
The ambient temperature and relative humidity (see "Relat-
ive humidity", page 16) are measured in mould warning
mode. The dew point temperature (see "Dew point temper-
ature", page 16) is calculated based on both values. The
surface temperature is also measured.
The dew point temperature is compared to the surface tem-
perature and the result is interpreted with regard to the risk
of mould forming.
Press the mould warning mode
button (12) to select the mould
warning mode. The indicator (i)
appears in the display for con-
firmation.
Press the measuring button (4) and aim the laser circle so
that it is perpendicular to the centre of the measuring object.
Once the measurement is complete, the measured relative
humidity is displayed in line (b), the measured ambient tem-
perature 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
interprets the result as follows:
– Green indicator LED (8): There is no risk of mould form-
ing under the current conditions.
– Yellow indicator LED (8): The values are near the limit;
pay attention to room temperature, thermal bridges and
humidity, and repeat the measurement if necessary at a
later point in time.
– Red indicator LED (8): There is an increased risk of
mould forming because the humidity is too high or the
surface temperature is close to the dew point temperat-
ure. The flashing relative humidity symbol (d) indicates
that the humidity in the room is too high; the flashing am-
bient temperature symbol (e) indicates that the room
temperature is too low; the flashing surface temperature
symbol (h) indicates thermal bridges.
When the risk of mould is given, you should – depending on
the cause – reduce the humidity through more frequent and
thorough ventilation, increase the room temperature and
eliminate thermal bridges. Contact a building expert, if ne-
cessary.
Note: Mould spores cannot be detected with the measuring
tool. It only indicates that mould may form if the conditions
remain unchanged.
Bosch Power Tools
Errors – causes and corrective measures
The following error messages on the display are all indicated
by the red indicator LED (8).
Measuring tool is not acclimatised
The measuring tool has been
subjected to extreme fluctu-
ations in temperature and did
not have sufficient time to ad-
just.
The measuring tool switches off automatically after five
seconds. Wait approximately 10 to 30 minutes until the
measuring tool has acclimatised to the current temperature.
You can speed up this process by regularly moving the meas-
uring tool in the room.
Ambient temperature outside the operating temperature
range
The ambient temperature is too
high or too low for the measur-
ing tool to operate. The measur-
ing tool switches off after five
seconds; no measurement can
be performed in these condi-
tions.
Surface temperature outside the measuring range
The surface temperature of the measuring object in the laser
circle is too high (Hi) or too low (Lo). The temperature of this
object cannot be measured. Aim the laser circle at another
object and start a new measurement.
Internal error
The measuring tool has experi-
enced an internal error and
switches off after five seconds.
To reset the software, remove
the batteries, wait a few
seconds and then reinsert the
batteries.
If the error persists, have the measuring tool checked by a
Bosch customer service agent.
Glossary of terms
Emissivity
The emissivity of an object depends on the material and the
structure of its surface. This specifies how much infrared
thermal radiation the object emits compared with an ideal
radiant warmer (black body, emissivity ε = 1) and accord-
ingly has a value between 0 and 1.
English | 15
1 609 92A 4NX | (20.04.2021)