UEi UGI INF200 - Manual (Page 3)

Backlight Operation
To toggle the backlight on or off, press the push-button with the
backlight “ “ symbol while the trigger is pulled. Once the backlight
has been turned on, it will come on each time the trigger is pulled until
it is toggled off. Please note that this feature significantly reduces the
battery’s life.
Measurement Modes
This instrument allows you to select from one of five display modes. You
can cycle through the modes in this order:
• Real-time temperature measurements
• Maximum temperature measured (MAX mode)
• Minimum temperature measured (MIN mode)
• Temperature difference between MAX and MIN (∆T mode)
• Calculated (time weighted) average temperature (AVG mode)
The last mode selected will remain selected the next time you pull
the trigger.
Real-time Temperature Measurement Mode
This display mode shows the actual temperature of surfaces
measured. This value is updated at least once ever 1/2 second. When
the instrument is powered up for the first time, this mode is pre-set.
Maximum Temperature (MAX) Mode
To enter the “MAX” display mode, pull the trigger, and press and
release the “MODE” push-button repeatedly until you see the word
“MAX” displayed on the LCD. In the “MAX” mode the highest
temperature measurement taken, during the current trigger pull, is
displayed on the LCD. The temperature reading will update each time
a higher temperature is measured.
Minimum Temperature (MIN) Mode
To enter the “MIN” display mode, pull the trigger, and press and release
the “MODE” push-button repeatedly until you see the word “MIN”
displayed on the LCD. In the “MIN” mode, the lowest temperature
measurement taken, during the current trigger pull, is displayed on the
LCD. The temperature reading will update each time a new lower
t e m p e rature is measured.
Average (AVG) Mode
To select the “AVG” display mode, pull the trigger and press and
release the “MODE” push-button repeatedly until “AVG” is displayed
on the LCD. The term “time weighted” in reference to the averaging
mode means all temperature measurements taken, from the time the
trigger was first pulled, are averaged while taking measurements in
this mode. If you were to walk along a wall for one minute taking
readings that were generally 72 degrees, then walk by a spot for
1/2 second that was 20 degrees, no significant change in average
temperature would be displayed.
Temperature Differential (∆T) Mode
To select the temperature differential display mode “∆T”, pull the trigger
and press and release the “MODE” push-button repeatedly until “∆T”
is displayed on the LCD. This display mode is used to determine the
net temperature difference between two surfaces. This is particularly
valuable when calculating net heating or cooling, since ambient
temperature is effectively removed from the equation.
Operating Instructions
Taking Measurement Samples
To take temperature measurements, point the instrument at the surface
to be measured and pull the trigger. A tube has been incorporated
along the top of the barrel to aid the user in spotting the surface area to
be measured (target).
Although this simple explanation works well in most cases, there are
other factors that may impact the measurement accuracy. Consider
there influences before using the data you obtain with your infrared
thermometer.
• The target must completely fill the spot diameter seen by the
infrared sensor, otherwise the temperature displayed will be
influenced by the surface surrounding the target. The ratio of
the distance from the end of the barrel to the size of the spot
being measured is 8:1. For example, using the INF200, an
object that is 6” in diameter can be accurately measured from
4’ away. When using the gun to find hot-spots, accuracy of the
reading is not as important as keeping the gun at the same
distance from the target for each sample measurement. If you
are looking for hot-spots on electrical panels, for instance, you
could take the readings from 6’ away each time, even though
you may only be filling half the spot diameter. The critical
information in this process would be any significantly
higher temperatures
• Emissivity of an object will also affect accuracy. See the
“Validation” section for details
• This instrument is sensitive to electromagnetic interference
(EMI), such as that generated by spark plug wires, radio
transmitters and welders. Do not use this instrument in close
proximity to equipment that may produce such interference
• The instrument must be used within the ambient temperature
range specified in the specification table
Each time the trigger is pulled your INF200 monitors four different
readings, regardless of the selected mode. They are:
• The highest temperature measured
• The lowest temperature measured
• The average temperature (time weighted)
• The Net difference between the light and low temperature “DT”
These four measurements go into the first memory location for future
recall, when the trigger is released. See “Recalling memory points” for
more details.
While the trigger is pulled, a temperature sample is taken at a minimum
of once every 1/2 second (500 milliseconds). The four parameters
mentioned above are updated at the same rate.
Selecting Fahrenheit or Centigrade Scales
Select the scale you prefer to use (˚F or ˚C) by pressing the (“˚F/˚C▼”)
push-button while the trigger is pulled.
INF200-MAN P. 2