testo 0614 1635 Información De La Aplicación página 3

Application information
Application
With the temperature probe for determining the U-value, in combination with a compatible
testo measuring instrument and a further temperature probe, the thermal conductivity
coefficient can be determined. The U-value is an important indicator for evaluating the
thermal characteristics of ready-to-use materials and building components.
Equipment required for determining U-value:
· For recording the measurement values: Measuring instrument testo 635-2
(recommended) or testo 635-1
· For measuring wall surface temperature Tw and indoor air temperature Ti: Temperature
probe for determining U-value 0614 1635
· For measuring outdoor air temperature: Radio probe 0613 1001 / 0613 1002
(recommended) or air probe 0602 1793.
· When using radio probes: Radio module 0554 0188 / 0554 0190
1) When using radio probes / module, observe approval for individual countries.
Carrying out U-value determination
In the following passage, the determination of the U-value with manual measurement
value recording is described, this is possible with the instruments testo 635-1 and
testo 635-2. Testo recommends recording the measurement values via a measurement
program (measurement rate 15min, measurement over one night), followed by
measurement data evaluation using PC software. This is possible with the instrument
testo 635-2 and the testo Comfort software. To set up a measurement program, please
read the documentation delivered with the measuring instrument testo 635-2.
The following prerequisites must be fulfilled in order to obtain correct measurement
results:
· Clear temperature difference between inside and outside (ideal: >15°C)
· Constant conditions (e.g. no sunlight radiation warming the outside wall)
· Heat transfer coefficient Alpha correctly set in the instrument (Recommended:
factory setting 7.69; suitable for most standard cases, since almost constant)
· Do not touch the wires/plugs of the temperature probe during the measurement
(Indoor temperature is determined via a sensor in the probe plug)
· Position the instrument during the measurement in a place protected from cold or
heat radiation (do not place on a windowsill, do not hold in your hand), distance
from the wall approx. 30cm, as far as possible at the same height as the three
wires of the temperature probe.
Temperature probe for calculating U value
0614 1635
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