Milwaukee M12 IR Operator's Manual download pdf (Page 20)

18 M12 160x120 Thermal Imager Operator’s Manual

Emissivity is the ratio of a target surface’s infrared output

(radiance) to that of a blackbody at the same temperature.

A “blackbody” is a theoretical perfect radiator of infrared

radiation (IR).

What this means is you can set the sensitivity of the

Thermal Imager to determine the true temperature of an

object, no matter what its IR radiation characteristics are.

The poorest radiators (surfaces with the lowest emissivity

ratios) need the most correction. These materials are things

like shiny metal and glass.

When you have a low-emissivity surface that you need

a very accurate temperature reading from, placing black

electrical tape or even painting it with at-black paint is

very effective. Black electrical tape and at-black painted

surfaces have an emissivity ratio of 0.95.

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Emissivity

Press , select SETUP, then press to get the Setup

Menu as shown in Figure 7. Press and as necessary

to select “EMISSIVITY.” This brings up the Emissivity Menu

as shown in Figure 11.

0.95 DEFAULT

0.30 ALUMINUM

0.30 CUSTOM

EMISSIVITY

MATERIAL

Figure 11. Emissivity Menu

This setting tells the Thermal Imager what surface

material it is measuring. This is important, because

setting the right emissivity has a signicant effect on the

accuracy of temperature readings. See Table 5 for a list

of the materials in the Thermal Imager Emissivity menu,

and their corresponding emissivity ratios. You can also

select “CUSTOM” in the emissivity menu, and select any

emissivity value. In Figure 11, “CUSTOM” shows “0.30,” but

when you select CUSTOM, you can choose any value.

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Milwaukee M12 IR Operator's Manual Page 20