Bosch Professional GIS 1000 C Original Instructions Manual page 16

16 | English
Errors – causes and corrective measures
Error
Measuring tool cannot be switched on.
Function indicator (s) for contact temper-
ature measurement does not appear on
the display.
Measuring tool cannot be connected to a
computer.
Glossary of terms
Infrared thermal radiation
Infrared thermal radiation is electromagnetic radiation emit-
ted by every body. The amount of radiation depends on the
temperature and the emissivity of the body.
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.
Reflected Temperature/Reflectivity of an Object
The reflected temperature is the thermal radiation that is not
emitted by the object itself. Depending on the structure and
material, background radiation is reflected in the object to
be measured, therefore distorting the actual temperature
result.
Thermal bridge
A thermal bridge is defined as a position on the external wall
of a building, where there is a localised increase in heat loss
due to a structural defect.
1 609 92A 62P | (14.10.2020)
Cause Corrective measures
Battery pack or batteries Charge the battery pack or change the batteries.
empty
Battery pack too hot or too Allow the battery pack to reach the correct temper-
cold ature or change it.
Image memory defective Format the internal memory by deleting all images
(see "<Delete All Images>", page 15). If the prob-
lem persists, send the measuring tool to an author-
ised Bosch after-sales service centre.
Image memory full Transfer the images to another storage medium
(e.g. computer or Notebook) when necessary. Then
delete the images in the internal memory.
Measuring tool faulty Send the measuring tool to an authorised Bosch
after-sales service centre.
Connection (25) for ther- Check the function of the thermocouple and send
mocouple or the thermo- the measuring tool to an authorised Bosch after-
sales service centre.
couple is defective
Measuring tool not recog- Check whether the driver on your computer is up to
nised by computer. date. It may be necessary to have a newer operating
system version on your computer.
Micro USB port or Micro Check whether the measuring tool can be connec-
USB cable defective ted to a different computer. If not, send the measur-
ing tool to an authorised Bosch after-sales service
centre.
Humidity and ambient tem- The other functions of the measuring tool can still be
perature sensor (5) defect- used. Send the measuring tool to an authorised
Bosch after-sales service centre.
ive
In order to evaluate the thermal bridges, the minimum re-
quirement of a heat shield outlined according to DIN 4108-2
can be used.
According to DIN 4108-2, the minimum requirement of a
heat shield is met if the temperature factor f
0.7.
The temperature factor f
T
1
f =
Rsi
T
3
T : Internal surface temperature
1
T : External temperature
2
T : Internal ambient temperature
3
The minimum heat shield acts to avoid mould under stand-
ard boundary conditions. This avoids buildings being put in
danger.
Under standard conditions (external temperature of –5 °C,
internal ambient temperature of 20 °C), the surface temper-
ature should not fall under 12.6 °C. This corresponds to an
Rsi
is calculated as follows:
Rsi
– T
2
– T
2
T T
3 1
is larger than
T
2
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