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6.2
Check the application conditions
8026846.1K1C/2023/06/07 | SICK
Subject to change without notice
GTB20 are photoelectric proximity sensors with background suppression. Depending on
the remission factor of the object to be detected, and perhaps the background behind
it, a minimum distance (y) between the set sensing range (x) and the background is to
be maintained.
Check the application conditions:
Adjust the sensing range and distance to the object and background as well as the
remission factor capability of the object according to the corresponding diagram (x
= sensing range, y = minimum distance between set sensing range and background
(white, 90%)) remission factor: 6% = black 1, 18% = gray 2, 90% = white 3 (relative
to standard white as per DIN 5033). We recommend that the adjustment be performed
with an object of low remission.
The minimum distance (= y) for the background suppression can be determined from
the diagram
[figure 5
1] as follows:
Example: x = 1.5 m, y = 1.25 m. That is, the background (white, 90%) is suppressed at
a distance of > 1.25 m of the configured sensing range.
Minimum distance in mm (y) between the set sensing
range (x) and white background (90 % remission)
1,000
(39.37)
1
800
6%/90%
(31.50)
600
(23.62)
18%/90%
400
(15.75)
200
(7.87)
0
0
0.5
1
1.5
(1.64)
(3.28)
(4.92)
Figure 5: Characteristic line, GTB20
1
0.06 /
1.5
0.1
2
0.02 /
1.8
0.1
3
0.005 /
0.1
0
0.5
1
1.5
2
2.5
(1.64)
(3.28)
(4.92)
(6.56)
(8.20)
Distance in m (feet)
D
C
A
Figure 6: Bar diagraph
A
Sensing range min. in m
B
Sensing range max. in m
C
Visibility range
Example:
Safe suppression of the background
2
3
90%/90%
Black object (6 % remission)
Set sensing range x = 1.0 m
Needed minimum distance to white
background y = 200 mm
2
2.5
3
3.5
(6.56)
(8.20)
(9.84)
(11.48)
Distance in m (feet)
3.0
3
3.5
(9.84)
(11.48)
B
O P E R A T I N G I N S T R U C T I O N S | GTB20
OPERATING INSTRUCTIONS
White
background (90 %)
x
y
en
33
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