-12-
-13-
Distance(D) to Spot (S) size D:S=12:1
D=9.45in(24cm)
D=14.17in(36cm)
S
0.79in
( 2cm)
1.18in
( 3cm)
To take accurate temperature measure-
ment of reflective surfaces with low
emissivity, place a strip of masking
tape over the surface and allow for it to
adjust to the temperature of the surface
for approximately 30 minutes. Measure
the surface, scanning the taped section,
eliminating the issue of inaccuracy.
Emissivity
The emissivity of a material is its
efficiency in emitting thermal energy.
Non-reflective surfaces have a higher
emissivity (closer to 1) than reflective
surfaces (closer to 0). Inaccurate
results may occur when measuring
reflective surfaces such as glass,
polished wood, and granite.
The emissivity of most organic
For the most accurate results, make
sure the target has a surface area of
twice the corresponding spot diameter.
Insufficient surface area will result in
inaccurate results. The recommended
distance to hold the thermometer from
the surface of measurement is 7.87inch
(20cm). This creates a spot
measurement area of 0.66inch(1.67cm)
in diameter.
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