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OPERATION
Using the Thermometer
Pull the trigger of the Infrared Thermometer to measure the surface
temperature of an area.
Field of Measurement
The Infrared Thermometer measures average surface temperature on the basis
of distance to spot diameter (D:S) ratio. This ratio is the size of the area being
measured by the thermometer as it relates to distance. The targeted area being
measured becomes larger as the distance from the thermometer increases. The
smaller the target, the closer the thermometer should be to it.
The D:S ratio for the Infrared Thermometer is 12:1, illustrated below.
Examples: If you're standing 12-feet (3.6 m) away from the target surface, the
area being measured will be 1-foot (0.3 m) in diameter. If your target surface is
1-inch (25 mm) in diameter, the thermometer must be within 12-inches (300 mm)
of the target.
Spot
1-In
2-In
3-In
1-Ft
(25mm)
Size
(50mm)
(75mm)
(300mm)
12-Inch
24-Inch
36-Inch
12-Feet
(300mm)
(600mm)
(900mm)
(3.6m)
Distance
Emissivity
Emissivity is the measurement of an object's ability to radiate heat. Emissivity
values range from 0 (shiny mirror) to 1.0 (blackbody). Most organic materials
and painted or oxidized surfaces have an emissivity close to 0.95. This
thermometer is preset (non-adjustable) to an emissivity value of 0.95. Refer to
the chart for a list of emissivity values for common surfaces.
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