Check The Application Conditions; Sensing Range Setting - SICK WTF26 Instrucciones De Operación

7
COMMISSIONING
7.2

Check the application conditions

7.3

Sensing range setting

8
Figure 1: Alignment
WTF26 are photoelectric proximity sensors with foreground suppression. The photoelec‐
tric proximity sensor requires a background as a reference. The remission and position
of the background should remain as uniform as possible. The maximum distance (x)
between the photoelectric proximity sensor and background as well as the minimum
object height (y) must be upheld.
As a rule, a WTF26 is used to detect very flat objects on a conveyor belt.
Check the application conditions: Compare distance between sensor and background,
minimal object height as well as radiance capability of background and object with the
associated diagram (see figure 2, page
height). Remission: 6% = black 1, 90% = white 2 (referring to standard white as per DIN
5033).
Example: x = 500 mm, y = 11 mm, i.e. a white object is detected from a height of
at least 11 mm on a black background. The distance between photoelectric proximity
sensor and background is 500 mm.
Table 6: Application conditions
Minimum object height in mm (y)
y
40
WTF26P-xxxxx4xx
90%/6%
35
30
25
20
6%/6%
15
6%/90%
10
5
90%/90%
0
0 100 200 300 400 500 600 700
(3.94) (7.87) (9.84) (15.75) (19.69) (23.62) (27.56)
Distance in mm (inch)
Figure 2: Characteristic line: WTF26
Black object, 6% radiance factor, in front of
1
black background, 6% radiance factor
Black object, 6% radiance factor, in front of white
2
background, 90% radiance factor
White object, 90% radiance factor, in front of
3
black background, 6% radiance factor
White object, 90% radiance factor, in front of
4
white background, 90% radiance factor
WTF26x-xxxxxx2xAxx with Teach-Turn adjustment:
8) (x = sensing range, y = minimum object
3
1
x
2
y
4
Background
x
Example:
800
Sensing range on black background, 6%,
(31.50)
x = 500 mm, y = 11 mm for white object
1
2
200 800
(7.87) (31.50)
Distance in mm (inch)
D
C
A B
A Sensing range min. in mm
B Sensing range max. in mm
C Viewing range
D Adjustable switching thresh‐
old for foreground suppres‐
sion
E Sensing range indicator
F Teach-Turn adjustment
Sensing range on black, 6%
1
radiance factor
Sensing range on white, 90%
2
radiance factor
8025684.9RH / 15.01.2021 | SICK
Subject to change without notice
BluePilot:
E
F