© PCE Instruments
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8
Further information
8.1
Field of view
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The object under test should be larger than the spot size calculated by the field of view diagram.
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The smaller the target object is, the closer the meter should be to it for accurate measuring.
-
When accuracy is critical, make sure the target is at least twice as large as the spot size.
8.2
Distance and spot size
As distance (D) from the object increases, the spot size (S) of the area measured by the unit
should become larger.
8.3
Locating a hot spot
To find a hot spot, first aim the thermometer at the area around the target, then scan up and down
until the hot spot is located.
8.4
Tips
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Not recommend for measuring shiny or polished metal surfaces like stainless steel, aluminium,
etc.
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You cannot make measurements through transparent surfaces such as glass.
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If the surface of the object under test is covered with frost, oil, grime, etc., clean it before making
a measurement.
9
Emissivities
Substance
Asphalt Concrete
Marble Human skin Ice
Cloth(black) Aluminium
Emissivity
0.95
0.95
0.94
0.98
0.98 0.98
0.30
Substance
Rubber Frozen food Timber Carbon
Brick Plastic
Lacquer
Emissivity
0.95
0.90
0.94
0.85
0.90 0.85
… 0.95 0.80 … 0.95
Substance
Ceramic Hot food
Fat-lute Copper
Snow Plaster
Glass
Emissivity
0.95
0.93
0.94
0.50
0.90 0.80
… 0.90 0.90 … 0.95
Substance
Leather Water
Textiles Lead
Sand Paper
Iron oxides
Emissivity
0.95
0.93
0.94
0.50
0.90 0.70
… 0.94 0.78 … 0.82
