Accessories
76 Rev. G Nov/2015 MI3
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.
holder: stainless steel
window: Zinc Sulfide
(visually transparent, flat)
0.75 ±0.05
(for LT, G5 models)
holder: stainless steel
window: Polymer
(milky transparent, flat)
0.7 ±0.02
(LT models only)
Table 6: 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 <Head> Page, page 50!
Make sure the measuring head and the protection window are at the same temperature!
Figure 65: 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 has an outer diameter of 17 mm (0.67 in) and can be directly screwed onto the
sensing head.
holder: stainless steel
window: Silicon
(visually opaque, curved)
0.75 ±0.05
(for LT models)
Table 7: Close Focus Lens
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