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 back-
ground, 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
deflection 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
KRT18BM
Multicolor contrast sensor
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