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5.7 Protective Window
Protective windows can be used to protect the sensor's optic against dust and other contaminations. For
sensors with plastic lenses the use of a protective window combined with the air purge is strongly
recommended.
The following table provides an overview of the available protective windows. All protective windows
have a transmission below 100%.
Order number
For model
XXXTXACTWX
LT
XXXTXACTWXS
LT
XXXTXACTWL
LT
XXXTXACTWLF1
LT
XXXTXACTWM
MT
XXXTXACTWGP
P7, G5
Determination of transmissivity of an unknown protective window:
If transmissivity of the measuring screen is not indicated on the data sheet, you can also determine the
transmissivity yourself. Please proceed as follows:
1.
Measure the temperature of the target object with the sensing head, without using the protective
window. Note correct setting of emissivity.
2.
Insert the protective window in the sensing head.
3.
Adjust the transmissivity in the software until the same temperature is displayed, as it was
determined without the protective window.
For more information regarding the mounting of a protective window, see section 8.5
Protective
Window, page 54.
XR
Designation
Material
none
Zinc Sulfide
none
Zinc Sulfide
(stainless steel)
none
Amtir
none
Polyethylene
(stainless steel)
foil
4 red dots
Sapphire
Calcium
2 red dots
Fluoride
Table 3: Protective Windows
Rev. B2 Feb 2017
Accessories
Transmissivity
0.75 ±0.05
for LT sensors with laser
0.75 ±0.05
for LT sensors with laser
0.65 0.05
max. 300°C (572°F)
for food applications,
0.75 0.05
non-poisonous, non-fragile
0.88 0.05
max. 1800°C (3272°F)
0.93 0.05
max. 600°C (1112°F)
Use
Replacing a
39
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