Accessories
MI3
67
The IR beam length within the right angle mirror is 18 mm (0.7 in.) which needs to be considered for
spot size calculations.
10.2.6
Protective Windows
Protective windows can be used to protect the sensing head from dust and other contamination.
The protective window can be directly screwed onto the sensing head. It has an outer diameter of
17 mm (0.67 in).
The following table provides an overview of the available windows.
Order number
Material
Transmission
T
ambient
XXXMIACPW
Zinc Sulfide
stainless steel
0.75 ±0.05
(for LT, G5 models)
180°C (356°F)
XXXMI3ACPWP
Polymer
stainless steel
0.7 ±0.02
(LT models only)
65°C (149°F)
Table 5: Available Protective Windows
For correct temperature readings, the transmission of the protective window must be set
via the control panel in the communication box. See section 8.2
Figure 58: Protective Window
10.2.7
Close Focus Lens
The close focus lens is designed to get very small measurement spots down to 0.5 mm (0.02 in). The
lens should be used for LT models only.
The close focus lens is made from Silicon, with a focal distance of 10 mm (0.39 in) and a transmission
factor of 0.75
±
0.05 (for 8 to 14 µm). It has an outer diameter of 17 mm (0.67 in). The close focus lens
can be directly screwed onto the sensing head. It withstands ambient temperatures up to 180°C
(356°F).
For correct temperature readings, the transmission of the close focus lens must be set via
the control panel in the communication box. See section 8.2
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