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PTi120
Users Manual
12
Emissivity Adjustment
All objects radiate infrared energy. The actual surface temperature and emissivity of the target
affects the quantity of energy radiated. The Imager senses the infrared energy from the surface of
the target and uses the data to calculate an estimated temperature value. Many common materials
such as wood, water, skin, cloth, and painted surfaces, including metal, radiate energy well and have
a high emissivity factor of
≥90 % (or 0.90). The Imager measures temperatures accurately on targets
with a high emissivity.
Shiny surfaces or unpainted metals do not radiate energy well and have a low emissivity factor of
<0.60. For the Imager to calculate a more accurate estimate of the actual temperature of targets with
a low emissivity, adjust the emissivity setting.
W Warning
To prevent personal injury, see emissivity information for actual temperatures.
Reflective objects result in lower than actual temperature measurements. These
objects pose a burn hazard.
Set emissivity as a direct value or from a list of emissivity values for some common materials. If the
emissivity value is <0.60, a caution shows on the display.
Note
Surfaces with an emissivity of
<
0.60 make it difficult to determine reliable and consistent actual
temperatures. The lower the emissivity is the greater the potential of error is when the Imager
calculates the temperature measurement because more of the energy reaching the camera is
specified as background temperature. This is also true even when adjustments to the
emissivity and reflected background adjustments are performed properly.
Transmissivity
When you do infrared inspections through IR windows, not all of the infrared energy emitted from the
target is transmitted through the optical material in the window. If you know the transmission
percentage of the window, adjust the transmission percentage in the Imager or in Fluke Connect
desktop software to improve the accuracy of the measurement.
When you do not do infrared inspections through an IR window, set Transmissivity to 100 % to
disable the correction percentage.
1.888.610.7664 sales@GlobalTestSupply.com
Fluke-Direct.com
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