6. 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 displayed on the
unit. In units with a laser, the laser is used for aiming purposes only.
6.1. 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.
6.2. Distance & Spot Size
As the distance (D) from the object increases, the spot size (S) of the
area measured by the unit becomes larger.
6.3. Locating a hot Spot
To find a hot spot aim the thermometer outside the area of interest, then
scan across with an up and down motion until you locate a hot spot.
Reminders:
1. Not recommended for use in measuring shiny or polished metal
surface (stainless steel, aluminium, etc.) See emissivity.
2. The unit cannot measure through transparent surfaces such as
glass. It will measure the surface temperature of the glass instead.
3. Steam, dust, smoke, etc. can prevent accurate measurement by
obstructing the unit’s optics.
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