IMPAC pyrometers IN 300 · IN 300/5
18
5
Optics
The pyrometers are equipped ex works with one of the following optics. These lenses are focusing
to certain distances, i.e. in these distances each lens achieves its smallest spot size in relation to
the measuring distance. The spot size will change in any other distance (shorter or longer). Please
notice that the measuring object must be as least as big as the spot size.
The name of the optics (e.g. optics 300) shows the measuring distance in mm (e.g. 300 mm) in
which it has the smallest spot size in relation to its measuring distance (IN 300, e.g. 20 mm).
The following drawings show the size of the spots in mm in dependence of the measuring dis-
tance. Values between the mentioned data can be calculated by interpolation. The spot size for
measuring distance 0 is the aperture diameter of the optics.
5.1
IN 300
Optics 300:
Spot size [mm]
Measuring distance [mm]
0
8
150
300
600
1000
85
48
20
14
5.2
IN 300/5
Optics 80:
5
0
80
200
14
2,5
Spot size [mm]
Measuring distance [mm]
Optics 160:
5
0
160
230
10
5
Spot size [mm]
Measuring distance [mm]
(lens tolerances are not taken into consideration)
