Infrared Temperature Switch (Hot Metal Detector) Polaris PS09 / PI16
Mechanical Installation
10
4.5
Spot Size Tables
The following tables show the optical data of the different device types. The values in the tables are ex-
emplary, intermediate measurement distances must be determined by interpolation. If the measuring
distance differs from the adjusted or specified, a measurement is also possible, but the spot size
changes (usually it is larger, see
4.5.1
Calculation of the Spot Size Diameter outside the Focused
Distance
). The measuring distances
are specified from lens front.
Optics
Measuring
(focus)
distance
a [mm]
Optics pull-out
S [mm]
Spot size M [mm]
Aperture Ø
D [mm]
PI16
250
–1000°C
PS09
and
PI16
all other
temp. ranges
OP09-A0
170
16
1.7
1.3
14 mm
185
14.7
1.8
1.35
200
13.4
1.9
1.4
220
12.1
1.95
1.45
245
11
2
1.5
OP09-B0
260
16
2.1
1.6
14 mm
280
15
2.4
1.85
300
13.3
2.7
2.1
350
12.9
2.9
2.25
400
12.1
3.3
2.5
450
11.2
3.7
2.9
500
11
4.3
3.2
OP09-C0
480
16
4
3.3
14 mm
500
15.7
4.3
3.2
600
14.6
4.8
3.6
800
13.3
6.1
4.6
1000
12.5
8
6
1250
11.9
9.3
7
1500
11.5
11
8.3
1750
11.2
13
10
2000
11
14.5
11
4.5.1 Calculation of the Spot Size Diameter outside the Focused Distance
The spt size diameter determines the area on the measurement object from which 90% of the tempera-
ture radiation is detected by the pyrometer; therefore the spot size tables specify spot sizes for different
measuring distances (or focused distances).
For calculating intermediate values in front of and behind the focused measuring distance, the following
formula can be used or the
Spot size calculator
integrated in
SensorTools
(under
5.2
):
a
Focused distance
M
Spot size diameter in the focused measuring
distance
a
1
Measuring distance longer than focused meas-
uring distance
M
1
Resulting spot size on measuring distance a
1
a
2
Measuring distance shorter than focused
measuring distance
M
2
Resulting spot size on measuring distance a
2
D
Aperture (specifies the spot size directly on the
optics’ lens, it differs depending on the optics
pull-out. The largest value applies at a fully extended optics, the lowest value is with inserted lens)
S
M
M
2
M
1
a
2
a
a
1
M
1
= (M+D)-D
a
1
a
M
2
= (M-D)+D
a
2
a
