IS 12-TSP / IGA 12-TSP Manual
Controls and Installation
•
18
3.6
Optics
The pyrometers are equipped ex works with a focusable optics. With this focusable optics
the
best possible distance ratio can always be adjusted for each distance within the optics limits (the
smallest and largest value of each optic for the measuring distance in the table).
Focusable optics IS 12-TSP
Focusable optics IGA 12-TSP
Measuring
distance
a
[mm]
Spot size
M
98
[mm]
Spot size
M
98
[mm]
Objective
length
S
[mm]
All temperature
ranges
200 ... 1020 °C 250 ... 1400 °C 300 … 1700 °C
O
p
tic
s
1
275
0.7
2
1.1
0.9
30
400
1.1
3
1.6
1.3
9
520
1.5
4.2
2.2
1.8
0
O
p
tic
s
2
385
1
2.7
1.5
1.2
30
700
1.9
5.2
3
2.4
8.5
1125
3.4
8.5
4.9
3.9
0
O
p
tic
s
3
540
1.4
3.5
2
1.6
30
3000
8.5
23
13
10
3
9000
26
72
38
30
0
Aperture
D [mm] *
)
13.5 ... 17
13.5 ... 17
*) The aperture is the effective lens diameter. It is depending on the objective length. The
biggest aperture value (17 mm) belongs to the fully extended objective (S = 30 mm), the smallest
aperture value (13.5 mm) for objective length S = 0. Intermediate values have to be interpolated
(e.g. calculating the spot size if the measuring distance differs from the adjusted distance). The
spot size calculator included in the InfraWin software is the easiest way to calculate the spot size
if the measuring distance differs from a fixed adjusted.
3.6.1
Adjusting the required measuring distance
The required measuring distance must be adjusted to achieve the
spot sized mentioned in the tables above.
For releasing the optics has to be turned anticlockwise. Then it
can be pushed or pulled to find the correct measuring distance
(see
3.5
,
Sighting
). For fixing the optics has to be turned
clockwise.
Note:
The measuring object has to be bigger than or at least as big as the spot size of
the pyrometer.
