Professional Series Thermal Imagers
Menus
15
3. Push:
•
Y
to decrease the temperature span.
•
Z
to increase the temperature span.
•
W
to move the span to a higher temperature level.
•
X
to move the span to a lower temperature level.
The scale along the right side of the display shows the thermal span increasing or decreasing in size and shows
the span as it moves to different levels within the total range. See Table
for more information about the minimum span.
Note
The Imager always powers up in the same Level/Span mode, Auto or Manual, as when the Imager was
powered down.
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 can 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.
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.com
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