SICK GTB20 Manuel D'utilisation page 38

OPERATING INSTRUCTIONS
6.2 Check the application conditions
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38 O P E R A T I N G I N S T R U C T I O N S | GTB20
GTB20M: Infrared light: Align the sensor with the object. Select the position so that the
infrared light (not visible) hits the center of the object. The correct alignment can only
be identified via the LEDs. See
opening (front screen) of the sensor is completely clean and not covered.
Figure 4: Alignment 1
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.
figure 4 and table 8. You must ensure that the optical
8026846.1LP5/2024-05-06 | SICK
Subject to change without notice