LumaSense Technologies IN 6/78-L - Manual (Page 15)

IN 6/78-L Operating Manual Controls and Connections · 15
3.3 Sighting
For exact measurement of the object temperature the pyrometer must be aligned correctly onto
the object. Pyrometers without sighting are normally used for measurement of bigger objects
for which exact alignment is not absolutely necessary. These pyrometers can be aligned only
with the thermal method.
3.3.1 Thermal Alignment
When measuring a hot object in front of a cooler background, it is usually sufficient to align the
pyrometer with the hottest spot on the object to achieve the highest temperature reading.
3.4 Optics
The pyrometer is equipped ex works with the following optics. The spot size will enlarge in any
other distance (shorter or longer). Please notice that the measuring object must be at least as
big as the spot size. The following drawing shows the size of the spot in mm in dependence of
the measuring distance. Values between the mentioned data can be calculated by interpolation.
The spot size for measuring distance 0 is the aperture diameter of the optics.
Note: Please note that the optical profiles show nominal dimensions. The spot size
diameter or the focal distance may be slightly different due to lens tolerances.
Note: The InfraWin program includes a Spot size calculator that roughly estimates the
unknown values. The values represented here are for reference purposes.
Spot sizes for intermediate distances that are not shown on the optical profiles, may be
calculated using the following formula: