
Thermalert
®
4.0 Series
Users Manual, Rev. 2.4, Jul 2021
98
13.2.7 Protective Windows (A-T40-PW-xx)
Protective windows can be used to protect the sensor’s optics against dust and other contamination.
Figure 13-20: Protective Window
The following table provides an overview of the available protective windows recommended for the spectral
models. All protective windows have a transmission below 100%.
Table 13-6: Protective Windows
Part number
Designation
Material
For model
Transmissivity Transmissibility
for Laser
A-T40-PW-LT
none
(stainless steel)
Zinc Sulfide
LT-30-SF0
LTB-30-SF0
LT-50-SF0
LT-70-SF2
0.62 ±0.05
yes
LT-07-CF0
LT-15-SF0
LT-30-CF1
LT-30-CF2
LTB-30-CF1
LTB-30-CF2
LT-50-CF2
LT-70-CF2
0.71 ±0.05
yes
A-T40-PW-PF
none
(stainless steel)
Polyethylene foil
for food applications,
non-poisonous, non-
fragile
LT-30-SF0
LT-50-SF0
LT-70-SF2
0.67 ±0.05
no
LT-07CF0
LT-15-SF0
LT-30-CF1
LT-30-CF2
LT-50-CF2
LT-70-CF2
0.75 ±0.05
no
A-T40-PW-MTP3
4 red dots
Sapphire
MT-30-SF0
MT-70-SF2
P3-20-SF4
0.7 ±0.05
yes
MT-30-CF1
MT-30-CF2
MT-70-CF1
MT-70-CF2
0.77 ±0.05
yes
A-T40-PW-HT
3 red dots
Glass
HT-60
0.89 ±0.05
yes
1ML-150
0.91 ±0.05
yes
1MH-150
0.9 ±0.05
yes
2M-150
0.92 ±0.05
yes
3M-70
0.89 ±0.05
yes
A-T40-PW-G5G7P7
2 red dots
Calcium Fluoride
G5-30
G5-70
G7-70
P7-30
0.81 ±0.05
yes
Note
To avoid erroneous readings, ensure that the transmission for the appropriate protective window must be set
in the sensor via software.
www.
.com
1.800.561.8187