Leuze electronic GmbH + Co. KG
In der Braike 1 D-73277 Owen Tel. +49 (0) 7021 573-0
KRT18BW. …2…
[email protected] • www.leuze.com
Adjusting the switching threshold
The sensitivity of contrast sensor KRT18B is set via the multiturn potentiometer.
Adjustment procedure
The description is provided using the example of a dark mark on a light background. For the case of a light mark on a dark background,
the terms mark and background simply need to be exchanged.
1.Positioning the background under the light spot.
If the bar graph indicator is to the left of the middle position, turn the multiturn potentiometer clockwise until the sensor switches
off (yellow indicator LED Q1 off). Several full turns may be necessary here.
2.Positioning the mark under the light spot.
If the bar graph indicator is to the right of the middle position, turn the multiturn potentiometer counterclockwise until the sensor
switches on (yellow indicator LED Q1 on). Several full turns may be necessary here.
3.Switch between mark and background and watch the bar graph while doing so. Turn the multiturn potentiometer until the deflec
-
tion between the mark and the background is symmetric about the middle of the bar graph.
4.If you are not able to find a setting that enables reliable detection, repeat the process with a different detection color.
Turning the spindle clockwise increases the sensitivity of the sensor. The
signal on the bar graph is increased.
Turning the spindle counterclockwise reduces the sensitivity of the
sensor. The signal on the bar graph is reduced.
LED Q1 off:
LED Q1 on:
>12s
L / D
>12s
L / D
>12s
L / D
>
12s
L
/ D
Q1
>12s
L / D
>
12s
L
/ D
Q1
KRT18BW
White light contrast sensor
