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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.
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).
MI3
info@Raytek-Direct.ca
Order number
XXXMIACPW
XXXMI3ACPWP
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
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
Material
Transmission
Zinc Sulfide
0.75 ±0.05
stainless steel
(for LT, G5 models)
Polymer
0.7 ±0.02
stainless steel
(LT models only)
Figure 58: Protective Window
Rev. F1 05/2013
Accessories
T
ambient
180°C (356°F)
65°C (149°F)
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