Emissivity Adjustment; Transmissivity; Memory Menu (Memory Gallery) - Fluke PTi120 User Manual

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
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.
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.
Surfaces with an emissivity of
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.

Memory Menu (Memory Gallery)

When the memory is 90 % full, a yellow message bar shows at the top of the display. When the memory
is full, the message bar changes to red. To capture more images when the internal memory is full, save
the images to an external memory device and delete the images from the Product.
Images are saved to the internal memory storage. Use the Memory menu to view, edit, or delete images. Images
are organized by the date they were captured with the newest images at the top.
W Warning
Note
< 0.60 make it difficult to determine reliable and consistent actual
Note
Pocket Thermal Imager
Memory Menu (Memory Gallery)
90 % (or 0.90). The
≥
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