HL-800K Infrared Laser Thermometer User Manual
Thermosense Limited
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W: www.thermosense.co.uk
Page 7
How to obtain Emissivity?
In the EMS mode, press and hold the
Laser/Backlight button 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 temperature value will be
in the middle of LCD; and Type K temperature 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,
emissivity 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 obtainable or a wrong emissivity will be obtained.
2.
The temperature of the target should be higher than the environment temperature. Normally,
100
℃
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.
Note: Measurement Considerations
Holding the meter by its handle, point the IR Sensor toward the object
whose temperature is to be measured. The meter automatically
compensates for temperature deviations from ambient temperature.
Keep in mind that it will take up to 30 minutes to adjust if wide ambient
temperatures are to be measured followed by high temperature
measurements, some time (several minutes) is required after the low
(and before the high) temperature measurements are made.
This is a result of the cooling process, which must take place for the IR
sensor.
BATTERY REPLACEMENT
1)
If battery power is not sufficient, the LCD will display A new 9V battery is required.
2)
Open the battery cover, take out the battery and replace with a new 9-Volt battery and close
the battery cover.
NOTES
How it Works
Infrared thermometers measure the surface temperature of an object. The unit’s optics sense
emitted, reflected, and transmitted energy, which is collected and focused onto a detector. The
unit’s electronics translate the information into a temperature reading, which is display on the unit.
In units with a laser, the laser is used for aiming purposes only.
Field of View
Make sure that the target is larger than the unit’s spot size. The smaller the target, the closer you should be
to it. When accuracy is critical, make sure the target is at least twice as large as the spot size.
