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InfraRed Thermometer User Manual
14.Distance & Spot Size
As the distance (D) from the object increases, the spot size (S) of the
area measured by the unit becomes larger.
14-1.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.
14-2.Reminders
•
Not recommended for use in measuring shiny or polished metal
surfaces (stainless steel, aluminum, etc.).See Emissivity
•
The unit cannot measure through transparent surfaces such as glass.
It will measure the surface temperature of the glass instead.
•
Steam, dust, smoke, etc., Can prevent accurate measurement by
obstructing the unit's optics.
14-3.Emissivity
Emissivity is a term used to describe the energy-emitting characteristics
of materials. Most (90% of typical applications) organic materials and
painted or oxidized surfaces have an emissivity of 0.95 (pre-set in the
unit). Inaccurate readings will result from measuring shiny or polished
metal surfaces. To compensate, cove the surface to be measured with
masking tape or flat black paint. Allow time for the tape to reach the
same temperature as the material underneath it. Measure the
temperature of the tape or painted surface.
14
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