SICK GTB20, Operating Instructions Manual

Page: 31 / 164

Figure 4: Alignment 2
6.2 Check the application conditions
GTB20 are photoelectric proximity sensors with background suppression. Depending on
the remission factor 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 is to
be maintained.
Check the application conditions:
Adjust the sensing range and distance to the object and background as well as the
remission factor capability of the object according to the corresponding diagram (x
= sensing range, y = minimum distance between set sensing range and background
(white, 90%)) remission factor: 6% = black
1
, 18% = gray
2
, 90% = white
3
(relative
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 = 1.5 m, y = 1.25 m. That is, the background (white, 90%) is suppressed at
a distance of > 1.25 m of the configured sensing range.
OPERATING INSTRUCTIONS
8026846/2022-06-09 | SICK O P E R A T I N G I N S T R U C T I O N S | GTB20 31
Subject to change without notice
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