ISR 320 Manual
Controls and Installation
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16
3.3
Optics
3.3.1
Spot Sizes
The ISR 320 has fixed optics for 300 mm or 800 mm measuring distance.
The table of spot sizes in relation to measuring distance shows examples of the pyrometer’s spot
size M [mm] in relation to the measuring distance a [mm] (min. 90% of the radiation intensity).
Increasing or decreasing the measuring distance will change the spot size.
.
Note:
In the 1-color (mono) mode, the pyrometer can measure objects at any distance
(whether focused or non-focused). However, the object has to be bigger than or at least
as big as the spot size of the pyrometer in the measuring distance.
In the 2-color (ratio) mode, the object can be somewhat smaller than the spot diameter.
ISR 320
a = 300
700 to 1700 °C
900 to 2500 °C
a = 800
700 to 1700 °C
900 to 2500 °C
Measuring
Distance
a [mm]
Spot
Diameter M
[mm]
Spot
Diameter M
[mm]
Measuring
Distance
a [mm]
Spot
Diameter M
[mm]
Spot
Diameter M
[mm]
300
3
1.6
800
8
4.2
500
12.3
10
1300
19.9
13.7
1000
35.7
31
2000
36.5
27
Note:
Effective aperture D for all temperature ranges is 11 mm.
3.3.2
Deviation from the Focused Measuring Distance
Spot sizes for non-focused distances (shorter or longer than the focused distance) may be
calculated by using the formula below.
Formula for Calculating Spot Sizes
The
InfraWin
software also includes a Spot Size Calculator that calculates the data for the
non-focused regions, if you enter the values of aperture D, focused measurement distance a,
and focused measuring field diameter M as found in the above table (see section 3.3.1).
