SICK WT24-2 Serie Bedienungsanleitung Seite 11

8008784.14BT | SICK
Subject to change without notice
WTB24-2 are photoelectric proximity sensors with background suppression. Depending on
the remission of the object to be detected, and perhaps the background behind it, a mini‐
mum distance (y) between the set sensing range (x) and the background should be main‐
tained.
Remission: 6% = black 1, 18% = gray 2, 90% = white 3 (referring 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 = 600 mm, y = 4.5 => 4.5% of 600 mm = 27 mm. That is, the background is
suppressed at a distance of > 627 mm from the sensor.
y
10
8
6
6%/90%
1
4
2
0
mm 200 400 600 800
Figure 5: WT24-2Xx4x, -2Xx5x, red light
y
10
8
6
6%/90%
18%/90%
1
4
2
0
mm 500 1000 1500
Figure 6: WT24-2Xx1x, -2Xx2x, infrared
light
3 Sensing range setting
Sensor with potentiometer: open the sensor cover and protective hood, make sure that no
dirt has gotten into the sensor.
The sensing range is adjusted with the potentiometer (type: without stop). Clockwise rota‐
tion: sensing range increased; counterclockwise rotation: sensing range reduced. We rec‐
ommend placing the object within the sensing range, e.g. see
18%/90%
2
x = 600 mm, y = 27 mm
(= 4.5% of 600 mm)
90%/90%
3
1
2
x
1000 1200 1400
3
Distance in mm
A = detection distance (depending on
object remission)
B= adjustment range
2
x = 1,000 mm, y = 30 mm
(= 3% of 1,000 mm)
90%/90%
3
1
2
x
2000 2500 3000 3
Distance in mm
A = detection distance (depending on
object remission)
B= adjustment range
COMMISSIONING
white back-
ground (90%)
x y
100 600
100 900
100
A B
white back-
ground (90%)
x y
100 1,300
100 1,800
100
A B
table 8. Once the sensing
8
1,200
2,500
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