PeakTech 4970 Bedienungsanleitung Seite 28

7.3. Locating a hot Spot
To find a hot spot aim the thermometer outside the area of interest,
then scan across with an up and down motion until you locate hot
spot.
NOTE!
1. The unit cannot measure through transparent surfaces such
as glass. It will measure the surface temperature of the glass
instead.
2. Steam, dust, smoke, etc. can prevent accurate measurement
by obstructing the unit´s optics.
7.5 Emissivity Values
Substance
Asphalt
Concrete
Cement
Sand
Earth
Water
Ice
Snow
Glass
Ceramic
Marble
Plaster
Mortar
Brick
Thermal
emissivity
0,90 to 0,98
0,94
0,96
0,90
0,92 to 0,96
0,92 to 0,96
0,96 to 0,98
0,83
0,90 to 0,95
0,90 to 0,94
0,94
0,80 to 0,90
0,89 to 0,91
0,93 to 0,96
Substance
Cloth (black)
Human skin
Lather
Charcoal (powder)
Lacquer
Lacquer (matt)
Rubber (black)
Plastic
Timber
Paper
Chromium oxides
Copper oxides
Iron oxides
Textiles
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Thermal
emissivity
0,98
0,98
0,75 to 0,80
0,96
0,80 to 0,95
0,97
0,94
0,85 to 0,95
0,90
0,70 to 0,94
0,81
0,78
0,78 to 0,82
0,90