When an object is far from the thermometer, by pressing laser button to light the laser to aim at object.
To
measure in the night, by pressing backlight button to light the backlight.
By pressing “ MODE ” button to change the mode of the second temperature, it can show AVG(average)
MAX(maximum), MIN(minimum), MAX-MIN.
By pressing ℃ / ℉ button to choose ℃ or ℉
temperature unit to show temperature.
Ⅶ . D:S ratio
The thermometer has a visual angle and visual spot size, a drawing shows it as following:
Object focus tube sensor
Make sure that the target is larger than the unit ’ s visual spot size. The smaller the target, the closer you
should be to it. The relationship between distance and spot size is 12:1, the drawing as following:
To
prevent the infrared of other object from entering thermometer, you had better be closer to object than
the distance calculated by ratio D:S=12:1.
Ⅷ . Emissivity
Emissivity is used to describe the energy emitting characteristic of materials. The greater the emissivity,
the stronger the emission capacity of the object is. Most organic materials and oxidized metal surfaces
have a emissivity between 0.85 to 0.98. The thermometer is designed according to that emissivity equals
0.95. When the Emissivity of an object is less than 0.95, the measurement temperature is less than the
actual temperature; and the emissivity of an object is more than 0.95, the measurement temperature is
more than the fact temperature.
A
shiny metal or a polished object surface has a low emissivity. Please
pay attention to the effect of emissivity of objects.
Ⅸ . Changing the battery
When the battery voltage is lower, the battery symbol appears, it indicates that we must change the
battery. Pinch OPEN characters on the battery cover, then pull it and can change a new battery. See the
drawing as right:
Ⅹ . Specifications
LCD display: double temperature 4 digitals LCD
D:S ： 12:1
Emissivity: 0.95
Spectral response: 8-14 um
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