T-CAM 300 P-SERIES USER MANUAL
20
9-16 Emissivity
The correct emissivity value is important in order to receive the most accurate temperature
measurement. Emissivity of a surface can have a large effect temperatures the imager
observes.
To more accurately measure materials with a low emissivity, an emissivity correction is
necessary. Adjusting the emissivity setting will allow the imager to calculate a more accurate
estimate of the actual temperature.
Emissivity is set directly in the imager. The emissivity displays on the LCD screen as E=x.xx
SEE CHART ON NEXT PAGE FOR COMMON MATERIAL VALUES.
Users can change the emissivity as follows:
1.
Press the Menu button to display Main Menu.
2. Select the Settings icon:
3. Press the Confirm button to open Sub-menu.
4. Select Measure parameter.
5. Press the Confirm button to open the Sub-menu’s menu.
6. Select Emissivity.
7. Press the Confirm button.
8. Adjust number using Navigation buttons.
9. Press the Confirm button to set Emissivity.
10. Press the Previous button continuously to exit the menu and return to the thermal
image interface.
All objects radiate infrared energy. The amount of energy radiated varies based on the actual
surface temperature and the surface emissivity of the object. The Thermal imager senses the
infrared energy from the surface of the object and uses this data to calculate an estimated
temperature value.
Many common objects and materials such as painted metal, wood, water, skin, and cloth are
particularly good at radiating energy and it is easy to get relatively accurate measurements.
For surfaces that are good at radiating energy (high emissivity), the emissivity factor is >=0.90.
This simplification does not work on shiny surfaces or unpainted metals as they have an
emissivity of <0.6. These materials are not good at radiating energy and are classified as low
emissivity.
