Sper Scientific 800002 Infrared IR Thermometer - Manual (Page 6)

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HOW THE PROBE SHOULD BE HELD
DURING MEASUREMENT
Correct Incorrect
6. Data Hold: During measurement, the
“HOLD” button (Fig.1-2) will hold the
measure value and the LCD will show
“D.H.” in the upper left of display.
Pressing the “HOLD” a second time will
release the data hold function.
7. Data Record: The recording function
displays the minimum and maximum
readings. To start, press the “RECORD”
button (Fig.1-4). “REC” will show in the
lower left of the display. With “REC” on:
• Press “RECALL”. “MAX” will show in
the display with the maximum
temperature value.
• Press “RECALL” again to change
display to show the minimum value.
“MIN” will show in the display.
• To exit record mode, press
“RECORD”. Display will revert to
current reading.
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EMISSIVITY
All objects emit invisible energy. The
amount of energy is proportional to the
object’s temperature and its ability to emit
energy. This ability to emit energy is called
emissivity and based upon the composition
of the object and the qualities of the surface.
Emissivity values range from 0.10 for a very
reflective object to 1.00 for a flat black
surface.
The probe of the IR Thermometer senses
energy and calculates the temperature
based on the amount of IR energy it
receives and a factory set emissivity value of
0.95, which will cover 90% of the typical
applications. However, if the emissivity
value of the measured material is not 0.95,
the emissivity value should be adjusted.
CALCULATING AND ADJUSTING
EMISSIVITY
To match the correct emissivity with the
specific value of the object is important in
order to obtain exact temperature. When the
emissivity of the object is unknown,
calculating the exact value can be difficult
and require the use of other devices.
However, there are several easy ways of
calculating the emissivity value. For
example:
Use a digital thermometer and a surface
probe to measure the object’s temperature
as close as possible. Then, while measuring