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STANDARD 9869-3
First edition
2023-11
Thermal insulation of building
elements — In-situ measurement
of thermal resistance and thermal
transmittance —
Part 3:
Probe insertion method
Isolation thermique des éléments de construction — Mesurage in
situ de la résistance thermique et du coefficient de transmission
thermique —
Partie 3: Méthode par insertion d'une sonde
Reference number
ISO 9869-3:2023(E)
© ISO 2023
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ISO 9869-3:2023(E)
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© ISO 2023
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Published in Switzerland
ii
© ISO 2023 – All rights reserved
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ISO 9869-3:2023(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and units. 2
5 Principle . 2
5.1 General . 2
5.2 Method without heat flow measurement . 2
5.3 Method with heat flow measurement . 2
6 Apparatus . 3
6.1 Temperature measuring devices . 3
6.1.1 Type of sensors and accuracy . 3
6.1.2 Sensor for measuring temperature distribution in walls . 3
6.1.3 Sensors for measuring surface and air temperatures . 4
6.2 Borescope . 4
6.3 Heat flow meter (HFM) . 5
7 Locations of the measured area and sensor installation . 5
8 Measurement conditions and period . 7
8.1 Gen
...