T-CAM 380 P-SERIES USER MANUAL
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8-22 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
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.
Users can change the emissivity as follows:
1.
Press the Menu button or tap the touchscreen to display the Main Menu.
2. Select the Parameter Settings icon:
3. Press the OK button to open Sub-menu.
4. Select Emissivity.
5. Press the OK button.
6. Adjust number using Navigation buttons.
7. Press the OK button to set Emissivity.
8. Press the Previous button to exit the menu.
A CHART CONTAINING COMMON EMISSIVITY VALUES APPEARS ON THE
NEXT PAGE.
SURFACES WITH AN EMISSIVITY OF < 0.60 MAKE RELIABLE AND CONSISTENT
MEASUREMENTS PROBLEMATIC. THE LOWER THE EMISSIVITY, THE GREATER
POTENTIAL FOR ERROR WITHIN THE DEVICE’S CALCULATIONS. ERRORS MAY
STILL OCCUR EVEN WHEN ADJUSTMENTS ARE PERFORMED PROPERLY.
