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.

EMISSIVITY

0.95DEFAULT

0.30CUSTOM

MATERIAL

0.30 ALUMINUM

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 significant 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.

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 flat-black paint is very effective. Black electrical tape and flat-black painted surfaces have an emissivity ratio of 0.95.

WARNING

To minimize the risk of electric shock, burn or fire, never apply electrical tape or paint to an electrically live surface. Always check to ensure the power has been turned off before touching a surface.

18	M12 160x120 Thermal Imager Operator’s Manual

2260-21 specifications

The Milwaukee 2260-21 is a state-of-the-art infrared thermometer designed primarily for industrial applications. This tool is integral for professionals who require precision in temperature measurements without direct contact with the surface being measured.

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The Milwaukee 2260-21 also boasts a backlit display, enabling visibility in low-light conditions. This feature is essential for professionals who often work in dimly lit environments, ensuring that temperature readings are clear and easily readable. Additionally, the display includes multiple measurement modes, allowing users to switch between Fahrenheit and Celsius according to their preferences.

Ease of use is another characteristic that sets the Milwaukee 2260-21 apart. The simple interface includes a one-handed operation feature, making it facile for technicians to take readings while performing other tasks. The device is also built with durability in mind, featuring a rugged housing that can withstand the rigors of job site conditions.

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