PeakTech 4960 Operation Manual page 48

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.
Reminders
1. The unit cannot measure through transparent surfaces such
as glass. It will measure the surface temperature of the glass
instead.
2. Steam, dust,
measurement by obstructing the unit´s optics.
7.4. Emissivity Values
Material
Aluminium
Brass
smoke,
Condition
polished
Raw surface
oxidized
Aluminium
oxide,
Aluminium
powder
matt
oxidized at
600°C
Polished
Wrought with
sandpaper
etc. can
Temperature-Range
50°C ... 100°C
20°C ... 50°C
50°C ... 500°C
normal Temperature
20°C ... 350°C
200°C ... 600°C
200°C
20°C
-47-
prevent accurate
Emissivity-
factor (ɛ)
0.04 ... 0.06
0.06 ... 0.07
0.2 ... 0.3
0.16
0.22
0.59 ... 0.61
0.03
0.2