Measurement Considerations - Waeco ST-8810 Operating Manual

ST-8810

Measurement considerations

5 Measurement considerations
How to use
Hold the thermometer by its handle and point the IR sensor towards the
object whose temperature you wish to measure. The thermometer automat-
ically compensates for temperature deviations from ambient temperature.
Keep in mind that it will take up to 30 minutes to adjust if wide variations of
ambient temperatures have been measured. After measuring low tempera-
tures and before measuring high temperatures, allow some time (at least
several minutes) for the cooling process of the IR sensor.
How it works
Infrared thermometers measure the surface temperature of an object. The
thermometer's optics sense emitted, reflected and transmitted energy, which
is collected and focused onto a detector. The thermometer translates the
information into a temperature reading which is indicated on the display. In
thermometers with a laser, the laser is used for aiming purposes only.
Field of view
Ensure that the target is larger than the unit's spot size. The smaller the
target, the closer you should be to it. If accuracy is critical, make sure the
target is at least twice as large as the spot size (fig. 1, page 17).
Distance and spot size
When the distance from the object increases, the spot size of the area
measured by the thermometer becomes larger (fig. 1, page 17).
Locating a hot spot
To find a hot spot aim the thermometer outside the area of interest, then scan
across the area of interest with an up and down motion until you locate the
hot spot.
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