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gSKIN
®
U-Value KIT: Instruction Manual
green
TEG
AG
Hofwisenstr. 50A
8153 Rümlang, Switzerland
T: +41 44 515 09 15
greenTEG.com
b.
For U-value measurements, make sure that the ambient air temperature is measured
(i.e. by measuring the temperature more than 5 cm away from the building element
and avoid direct solar radiation).
Note: The cables are typically used in aerospace and therefore meet highest requirements.
6.
Please verify that all sensors (temperature and heat flux) are displayed correctly by reviewing their graphs
under
“Real
-
time measurement”
. Here you can also directly review the approximate U-value (the U-value
will still fluctuate).
7.
On the home screen, push the
“Start logging“ button
and then do the following steps:
-
Check the sensitivity
1
-
Select the frequency for data logging (under ”Sampling rate”, e.g. 10 min or 30 min
2
)
-
Select start time (under “Start mode“, e.g. “immediately“)
-
Add a comment e.g. specifications about measurement location
After
you push the “Start measurement”
button, your data logging process begins. In the lower part of
your screen, you will see the text switch
from “save settings..” to “Measurement running..”
. While logging,
the LED of the logger flashes in blue (when charging it flashes in yellow; when it is fully charged the
logger stops flashing yellow light while having a connection to the computer).
NOTE: If the LED of the logger is red, no connection with your computer is established. In this case,
please make sure that all cables are connected correctly and that there is no problem with the USB port
you use.
8.
After logging data for
72 hours
, you should receive an exact U-value according to ISO 9869
2
. You can
stop the measurement process by selecting the
“
L
ogger”
tab and there the
“
Stop measurement
“ function.
We recommend that you first review your current measurement process (as indicated in step 9) before
you stop your ongoing measurement. The following box outlines the conditions, which should be fulfilled
for a successful measurement according to ISO 9869
2
:
Short outline of the measurement conditions regarding ISO9869:
I.
Duration of the measurement > 72h (+ an integer multiple of 24). The software automatically calculates
the appropriate time frame (see Appendix A)
II.
U-value obtained at the end of the test does not deviate more than 5% from the value obtained 24h
before (dR24)
III.
The U-value obtained during the first 2/3 of the overall measurement period does not deviate more than
5% from the values obtained during the last 2/3 of the overall measurement period.
IV.
The change in heat stored in the wall is <= 5% of the heat passing through the wall.
While test conditions I.
–
III. are validated by the software, condition IV. is not tested. greenTEGs measurement
system does not allow measurement of heat storage changes of the wall.
Appendix A explains the test conditions in detail.
9.
To analyse your logged data and to verify if you really should stop the logging, please select
“
Read
r
ecord”
(on home screen). In the next window, you need to select the data set you want to be displayed
1
You can a
dapt the sensitivity of your sensor by selecting the “calibrate” function. Please make sure that the sensitivity shown
here matches the sensor’s sensitivity on your
calibration sheet.
Please change these settings only if you use another heat flux
sensor
; the value stored here should match with the sensor`s sensitivity shipped to you.
2
ISO 9869 indicates that data acquisition intervals should be less than 30 min. (1 data point per 10 min. can easily be handled
with a fully charged data logger
–
the battery will be charged automatically via the USB cable when connected to your laptop).
Ensure that you have connected the data logger to your computer for some hours, before you start with your first measuring
trial, as for longer measuring times you need to have a fully charged battery.
