How To Obtain Emissivity; Measurement Considerations - Sonel DIT-130 Manual De Uso

6.1 How to obtain Emissivity?

In the EMS mode, press and hold the Trigger and in the same
time press the Laser/Backlight button twice: once short and second
one longer until the EMS icon on the left side of LCD blinking. At
this time, "ε= --" will appear at the upper side of the LCD; IR tem-
perature value will be in the middle of LCD; and Type K tempera-
ture value is at the lower side of the LCD.
Contact the Type K probe to the object surface and test the
temperature of same point with IR measurement. After both values
are stable, press UP or DOWN button for confirmation. Then, emis-
sivity of the object will be shown at the upper side of the LCD.
Press MODE button or trigger to enter normal measurement.
Note:
1. When the IR value is not corresponding to the TK value, or IR
and TK tested the different points, no emissivity will be obtain-
able or a wrong emissivity will be obtained.
2. The temperature of the target should be higher than the envi-
ronment temperature. Normally, 100°C is suitable for obtaining
a higher accuracy emissivity.
After obtaining the emissivity, if the difference between IR value
(in the middle of LCD) and TK value (at the lower side of LCD) is
too big, the obtained emissivity will be incorrect. It's necessary to
obtain a new emissivity.

6.2 Measurement considerations

Holding the meter by its handle, point the IR Sensor toward the
object whose temperature is to be measured. The meter automati-
cally compensates for temperature deviations from ambient tem-
perature. Keep in mind that it will take up to 30 minutes to adjust to
wide ambient temperatures are to be measured followed by high
temperature measurements, some time (several minutes) is re-
quired after the low (and before the high) temperature measure-
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DIT-130 – USER MANUAL