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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
converts the information into a temperature reading, which is display on the unit. In unit that comes with a
laser pointer, the laser serves only for aiming purposes.
Field of view
Make sure that the target is larger than the unit’s spot size. The smaller the target, the closer you should
aim to the target. When accuracy is critical, make sure the target is at least twice as larger as the spot
size.
Distance & Spot Size
As the distance (D) from the object increases, the spot size (S) of the area measured by unit becomes
larger. The relationship between distance and spot size for each unit is listed below.
Locating a Hot Spot
To find a hot spot, aim the thermometer outside the area of interest, and then scan across with an up and
down motion until you located hot spot.
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 flat 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.
Storage & Cleaning
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The sensor lens is the most delicate part of the thermometer. The lens should be kept clean at all the
time, care should be taken when cleaning the lens using only a soft cloth or cotton swab with water or
medical alcohol. Allowing the lens to fully dry before suing the thermometer.
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Do not submerge any part of the thermometer.
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The thermometer should be stored at room temperature between -20 to 65 (-1 to 149 )
Reminders
