RayTek MI Miniature Infrared Sensor - Manual (Page 67)

Accessories
MI 59
8.8 Protective Window
The protective window can be used to protect the sensing head from
dust and other contamination. This should be applied especially for
sensors without a lens. These are all models with an optical
resolution of 2:1.
The protective window is made from non‐poisonous zinc sulfide,
with a transmission factor of 0.75 ± 0.05. It has an outer diameter of
17 mm (0.67 in). The protective window can be directly screwed to
the sensing head. It withstands ambient temperatures up to 180°C
(356°F).
For correct temperature readings, the transmission of the
protective window must be set via the control panel in the
sensor’s electronic housing, see section 6.2
Setting of
Modes on page 35!
Figure 44: Protective Window (XXXMIACPW)