MSA Evolution 6000 Operating Manual page 16

Use
High and Low Sensitivity Mode
The camera has a high and a low sensitivity mode for showing images in different temperature
ranges.
After turning the camera ON it will be in the high sensitivity mode.
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The camera automatically switches from high sensitivity mode to low sensitivity mode in case
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of extreme heat (a significant portion, 32% of pixels) of the image exceeding 140 °C.
In this case, the display shows a small green triangle above the color reference bar to indicate
that the scale changed from the high sensitivity mode scale. A larger green triangle appears in
the upper left-hand corner of the display.
The camera switches from low sensitivity mode to high sensitivity mode when 89% of pixels
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show less than 120 °C.
In the low sensitivity mode, the camera's dynamic range expands to enable the user to distinguish
objects and people more easily in environments with large temperature ranges. This mode also
prevents white-out. (White-out or oversaturation occurs when a thermal imaging detector is sub-
jected to too much thermal energy, and the image, which appears as a white cloud, no longer iden-
tifies fine details in the scene.)
Shutter Indicator
When the camera is in operation, it is periodically necessary to refresh the focal plane array in
order to operate properly. This occurs via an internal shutter mechanism. When the camera shut-
ters, the camera image freezes for approximately one second.
The shutter indicator is a green square shown at the top left of the display for approx. 3 sec before
and during the shuttering cycle (Pos. 1, Fig. 4, page 15).
Shuttering may occur more frequently with greater heat load.
Digital Temperature Target/Digital Temperature Indicator
The Digital Temperature Indicator provides an approximate numeric temperature of an object in
Fahrenheit or Celsius, depending on the camera settings. To measure the temperature of an ob-
ject, aim the camera so the digital temperature target (Pos. 5, Fig. 4, page 15) in the center of the
display is on the object to be measured.
NOTE: Displayed temperature is an average of pixels within the green box. An incorrect temper-
ature could display if all pixels are not on the object to be measured.
Temperature range is:
-40°F (-40°C) to 1022°F (550°C) in Low Sensitivity mode and
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-40°F (-40°C) to 320°F (160°C) in High Sensitivity mode.
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Displayed temperature is intended to provide the user with an approximate temperature reading.
See chapter 7 for the Digital Temperature Indicator accuracy.
Temperature Indicator Bar
The Temperature Indicator Bar works with the Digital Temperature Indicator to graphically repre-
sent the approximate temperature of an object in the green box in the center of the display.
16 EVOLUTION 6000 Thermal Imaging Camera
MSA
US