IS 140 • IGA 140 Manual
Controls and Installation
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19
3.4 Optics
The pyrometers are equipped with one of the following optics. This allows the adjustment to
the needed measuring distance to offer the smallest possible spot sizes.
Note:
The measuring object must be as least as big as the spot size.
3.4.1 Measuring Distance
Focusable optics 1: measuring distance 130 to 200 mm
Distance
a
[mm] 130
140
150
160
170
180
190
200
Spot size Ø M
[mm]
0.35 0.4
0.45 0.50 0.55 0.60 0.65 0.7
Objective length S
[mm]
26
18
13
9
5.7
3
0.7
0
Focusable optics 2: measuring distance 190 to 420 mm
Distance a [mm]
190 220 240 260 280 300 320 340 360 380 400 420
Spot size Ø M
[mm]
0.5 0.6 0.65 0.7 0.75 0.8 0.85 0.95 1.0 1.1 1.2 1.3
Objective length S
[mm]
26 17.7 13.8 10.8 8.3 6.3 4.6 3.1 1.9 1.0 0.3 0
Focusable optics 3: measuring distance 340 to 4000 mm
Distance a [mm]
340 400 450 500 600 800 1000 1500 2000 2500 3000 3500 4000
Spot size Ø M
[mm]
0.9 1.15
1.3 1.45 1.8 2.4 3.2 4.8 6.5 8.2 10.0 12.0 15.0
Objective length S
[mm]
26 20.9
17.9 15.6 12.5 8.6 6.5 3.8 2.5 1.8 1.3 0.9 0
Aperture D
:
temperature range up to 1500 °C: 14 to 16 mm
temperature range above 1500 °C: 8 to 9 mm
(The aperture is the effective lens diameter. It is depending on the objective length. The biggest aperture value belongs to the
fully extended objective (S = 26), the smallest aperture value for objective length S = 0)
3.4.2 Adjusting the required measuring distance
The required measuring distance must be adjusted to achieve
the spot sizes mentioned in the tables above. This can be done
between the smallest and the biggest limit value.
For releasing the optics has to be turned anticlockwise. Then it
can be pushed or pulled to find the correct measuring distance.
For fixing the optics has to be turned clockwise.
Adjusting the measuring distance with help of the table:
The table mentions the minimum and maximum measuring
distance for each optics (this corresponds to the longest or the
shortest objective length) as well as several other values. The
objective length “S” can be measured with a caliper.
Adjusting the measuring distance with help of the thru-
lens view finder
The focusable optics is correctly adjusted to the required distance, if the measuring object is
shown as a sharp image in the view finder. A circle marks the position of the measuring spot.
release
fix
push / pull
Objective length S
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