Check The Application Conditions - SICK WTF4F Instrucciones De Uso

7
COMMISSIONING
7.2

Check the application conditions:

8
WTF4FD: visible red light. Align the sensor with the background. Select the position
so that the red emitted light beam hits the objects. You must ensure that the optical
opening (front screen) of the sensor is completely clear
Figure 2: Alignment
Sensing range
WTF4FD are photoelectric proximity sensors with foreground suppression. The photo‐
electric proximity sensor requires a background as a reference. The radiance factor
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 WTF4FD 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 3, page
height). Radiance factor: 6% = black 1, 90% = white 2 (referring to standard white as
per DIN 5033).
Example: x = 45 mm, y = 0,8 mm, i.e. a black object is detected from a height of at
least 0,8 mm on a white background.
Minimum object height in mm (inch)
y
24
(0.94)
20
1
(0.79)
6%/6%
16 90%/6%
(0.63)
12
(0.47)
8
(0.31)
6%/90%
4
90%/90%
(0.16)
2
x
0
0 20 40 60 80 100
(0.79) (1.57) (2.36) (3.15) (3.94)
Distance in mm (inch)
Recommended sensing range for
the best performance
Figure 3: Characteristic line
8) (x = sensing range, y = minimum object
1
0
2
Example:
0
Reliable detection of the object
0
x
y
Background
White background (90 % radiance factor)
A
Distance of sensor to background x = 40 mm
Required minimum object height y = 0.7 mm
For all objects regardless of their colors
Figure 4: bar graph
A
B
C
D
E
F
15 95
15 100
20 40 60 80 100
(0.79) (1.57) (2.36) (3.15) (3.94)
Distance in mm (inch)
D
C
B
Sensing range min. in mm
Sensing range max. in mm
Viewing range
Adjustable switching threshold for fore‐
ground suppression
Sensing range indicator
Teach-Turn adjustment
8025301 / 2020-11-13 | SICK
Subject to change without notice
BluePilot
E
F