WT34 are photoelectric proximity sensors with background suppression. Depending on the
remission 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 should be maintained.
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 [
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.
10
8
6
4
2
0
6%/90%
18%/90%
90%/90%
mm
200
400
600
800
1000 1200 1400
Distance in mm
1
2
3
y
x
Figure 5: WT34-Xx4x, -Xx5x, red light
y
x
white back-
ground (90%)
x = 600 mm, y = 27 mm
(= 4.5% of 600 mm)
100
600
100
900
100
1,200
1
2
3
A
B
A = Detection distance (depending on
object remission)
B= Adjustment range
10
8
6
4
2
0
6%/90%
18%/90%
90%/90%
mm
500
1000
1500
2000
2500
3000
Distance in mm
1
2
3
y
x
Figure 6: WT34-Xx1x, -Xx2x, infrared
light
y
x
white back-
ground (90%)
x = 1,000 mm, y = 30 mm
(= 3% of 1,000 mm)
100
1,300
100
1,800
100
2,500
1
2
3
A
B
A = Detection distance (depending on
object remission)
B= Adjustment range
3
Sensing range setting
Sensor with potentiometer: open the sensor cover and protective hood, make sure that no
dirt has gotten into the device.
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
. Once the sensing
range has been adjusted, the object is removed from the path of the beam, which causes
the background to be suppressed and the switching output to change [see
COMMISSIONING
8
8009202.11O1 | SICK
Subject to change without notice
11
