optris CS series - Optical Charts

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2.5 Optical charts
The following optical charts show the diameter of the measuring spot in dependence on the distance
between measuring object and sensing head. The spot size refers to 90 % of the radiation energy.
The distance is always measured from the front edge of the sensor housing/ CF-lens holder/ air purge.
Figure 1: Optical chart CS (15:1)
• The size of the measuring object and the optical resolution of the infrared
thermometer determine the maximum distance between sensing head and
measuring object.
• In order to prevent measuring errors the object should fill out the field of view of the
optics completely. Consequently, the spot should at all times have at least the
same size like the object or should be smaller than that.