Notes - SKF TKTL 21 Mode D'emploi

10. Notes

How does Infrared work?
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.
The laser is used for aiming purpose only.
• Field of View
Make sure the target is larger than the unit's spot size.
The smaller the target, the closer you should be.
When accuracy is critical, make sure the target is at least twice as
large as the spot size.
• Distance & Spot Size
As the distance (D) from the object increases, the spot size (S) of the
area measured by the unit becomes larger.
See figure at the beginning of this manual.
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 hot
spot.
• Reminders
- Do not use the unit to measure shiny or polished metal
surfaces (stainless steel, aluminum, etc.). See Emissivity.
- The unit can not measure through transparent surfaces such
as glass. It will measure the surface temperature of the glass
instead.
- Steam, dust, smoke, etc., can prevent accurate measurement
by obstructing the unit's optics.
• Emissivity
Emissivity is a term used to describe the energy-emitting
characteristics of materials.
Most (90% of typical applications) organic materials and painted or
oxidized surfaces have an emissivity of 0.95 (pre-set in the unit).
Inaccurate readings will result from measuring shiny or polished
metal surfaces. To compensate, cover the surface to be measured
with masking tape or black paint. Allow time for the tape to reach the
same temperature as the material underneath it.
Measure the temperature of the tape or painted surface.
14 EN