including magnetic, eddy current and ultrasonic coating thickness,
environmental, surface profile, shore hardness durometer, salt
contamination, and ultrasonic wall thickness probes.
Emissivity refers to a material’s ability to emit infrared energy,
compared to an ideal black surface at the same temperature. The
ratio varies from 0 to 1, and each material has a specific emissivity
associated with it. The
PosiTector
IRT
has built in emissivity
settings for certain materials as well as a user-adjustable
emissivity option (pg. 6).
Most organic and painted surfaces have an emissivity of around
0.95, and are ideal surfaces for accurate infrared temperature
readings. Shiny or reflective surfaces can be difficult to measure
with an infrared thermometer, as they tend to reflect ambient
infrared energy instead of their own. To compensate for this, cover
such surfaces with flat paint or a piece of electrical tape. Allow the
paint or tape to acclimate to the surface’s temperature, and take a
measurement over the paint or tape.
Emissivity
Emissivity
Distance to Spot Ratio (D:S)
Distance to Spot Ratio (D:S)
The distance to spot ratio refers
to the relationship between the
diameter of the area being
measured compared to the
instrument’s distance from the
area. As the distance (D) from
the target increases, the spot
size (S) of the area being
measured by the unit becomes
larger. The D:S ratio of the
PosiTector
IRT
is 5.7:1. For
example, when the instrument is
100 cm (40 inches) from the
target, the spot size will be about
18 cm (7 inches) in diameter.
Distance
Spot Size
4
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