User's Manual
Table Of Contents
- Table of contents
- 1 Warnings & Cautions
- 2 Notice to user
- 3 Customer help
- 4 Documentation updates
- 5 Important note about this manual
- 6 Parts lists
- 7 Quick Start Guide
- 8 Camera parts
- 9 Screen elements
- 10 Navigating the menu system
- 11 Connecting external devices and storage media
- 12 Pairing Bluetooth devices
- 13 Configuring Wi-Fi
- 14 Handling the camera
- 15 Working with images
- 16 Working with thermal fusion and picture-in-picture image modes
- 17 Working with measurement tools
- 18 Fetching data from external Extech meters
- 19 Working with isotherms
- 20 Annotating images
- 21 Recording video clips
- 22 Changing settings
- 23 Cleaning the camera
- 24 Technical data
- 25 Dimensional drawings
- 25.1 Camera dimensions, front view (1)
- 25.2 Camera dimensions, front view (2)
- 25.3 Camera dimensions, side view (1)
- 25.4 Camera dimensions, side view (2)
- 25.5 Camera dimensions, side view (3)
- 25.6 Infrared lens (30 mm/15°)
- 25.7 Infrared lens (10 mm/45°)
- 25.8 Battery (1)
- 25.9 Battery (2)
- 25.10 Battery (3)
- 25.11 Battery charger (1)
- 25.12 Battery charger (2)
- 25.13 Battery charger (3)
- 25.14 Battery charger (4)
- 26 Application examples
- 27 Introduction to building thermography
- 27.1 Disclaimer
- 27.2 Important note
- 27.3 Typical field investigations
- 27.3.1 Guidelines
- 27.3.2 About moisture detection
- 27.3.3 Moisture detection (1): Low-slope commercial roofs
- 27.3.4 Moisture detection (2): Commercial & residential façades
- 27.3.5 Moisture detection (3): Decks & balconies
- 27.3.6 Moisture detection (4): Plumbing breaks & leaks
- 27.3.7 Air infiltration
- 27.3.8 Insulation deficiencies
- 27.4 Theory of building science
- 27.4.1 General information
- 27.4.2 The effects of testing and checking
- 27.4.3 Sources of disruption in thermography
- 27.4.4 Surface temperature and air leaks
- 27.4.5 Measuring conditions & measuring season
- 27.4.6 Interpretation of infrared images
- 27.4.7 Humidity & dew point
- 27.4.8 Excerpt from Technical Note ‘Assessing thermal bridging and insulation continuity’ (UK example)
- 28 Introduction to thermographic inspections of electrical installations
- 28.1 Important note
- 28.2 General information
- 28.3 Measurement technique for thermographic inspection of electrical installations
- 28.4 Reporting
- 28.5 Different types of hot spots in electrical installations
- 28.6 Disturbance factors at thermographic inspection of electrical installations
- 28.7 Practical advice for the thermographer
- 29 About FLIR Systems
- 30 Glossary
- 31 Thermographic measurement techniques
- 32 History of infrared technology
- 33 Theory of thermography
- 34 The measurement formula
- 35 Emissivity tables
The temperature changes associated with variations in the U value are generally
gradual and symmetrically distributed across the surface. Variations of this kind do
of course occur at the angles formed by roofs and floors and at the corners of walls.
Temperature changes associated with air leaks or insulation defects are in most
cases more evident with characteristically shaped sharp contours. The temperature
pattern is usually asymmetrical.
During thermography and when interpreting an infrared image, comparison infrared
images can provide valuable information for assessment.
The sources of disruption in thermography that occur most commonly in practice are
■ the effect of the sun on the surface being thermographed (sunlight shining in
through a window);
■ hot radiators with pipes;
■ lights directed at, or placed near, the surface being measured;
■ air flows (e.g. from air intakes) directed at the surface;
■ the effect of moisture deposits on the surface.
Surfaces on which the sun is shining should not be subjected to thermography. If
there is a risk of an effect by sunlight, windows should be covered up (closing Venetian
blinds). However, be aware that there are building defects or problems (typically
moisture problems) that only show up when heat has been applied to the surface,
e.g. from the sun.
For more information about moisture detection, see section 27.3.2 – About moisture
detection on page 87.
A hot radiator appears as a bright light surface in an infrared image. The surface
temperature of a wall next to a radiator is raised, which may conceal any defects
present.
For maximum prevention of disruptive effects from hot radiators, these may be shut
off a short while before the measurement is taken. However, depending on the con-
struction of the building (low or high mass), these may need to be shut off several
hours before a thermographic survey. The room air temperature must not fall so much
as to affect the surface temperature distribution on the structure’s surfaces. There is
little timelag with electric radiators, so they cool down relatively quickly once they
have been switched off (20–30 minutes).
Lights placed against walls should be switched off when the infrared image is taken.
During a thermographic survey there should not be any disruptive air flows (e.g. open
windows, open valves, fans directed at the surface being measured) that could affect
the surfaces being thermographed.
110 Publ. No. T559597 Rev. a554 – ENGLISH (EN) – September 27, 2011
27 – Introduction to building thermography