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6.3
Setting
8026846.1LP5/2024-05-06 | SICK
Subject to change without notice
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 curve, GTB20
1
Black object, 6 % remission factor
2
Gray object, 18 % remission factor
3
White object, 90 % remission factor
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: Sensing range diagram, GTB20
A
Sensing range min. in m
B
Sensing range max. in m
C
Field of view
D
Adjustable switching threshold for background suppression
Check the function as described in
behave as described in
see table 8, page
Sensing range setting
The sensing range is adjusted with the potentiometer (type: Multiturn, 7 rotations).
Clockwise rotation: sensing range increased; counterclockwise rotation: sensing range
reduced. It is recommended to place the object within the sensing range, e.g. see
figure
8.
Adjustable sensing range: 100 mm ... 3000 mm.
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
see table 8, page
35. If the digital output fails to
35, check the application conditions.
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
39
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