Balluff BOS01EY Betriebsanleitung Seite 6

BOS 18M
Photoelectric Sensors – Infrared light diffuse reflective
Display and operating elements
single turn potentiometer for setting of
switching point
green LED: indicates power/error
yellow LED: indicates light reception/
limit range
Fig. 3: Display and operating elements
Green LED
– Power indicator
LED on: the sensor is operating.
– Error indicator
LED flashes: short circuit or overload at pin 4.
Yellow LED
– Indicator of light reception
LED on: light at receiver, excess gain > 1.5.
– Indicator of limit range
LED flashes: light at receiver, excess gain ≤ 1.5.
Potentiometer
(only at sensors ID20)
Serves for precise setting of switching point.
Setting
1. Position the sensor at the desired distance to the
object.
2. Turn the sensitivity potentiometer to minimum range.
3. Turn the potentiometer slowly clockwise until the yellow
LED goes on.
The object is now detected.
4. Remove the target.
The yellow LED goes off.
5. Continue turning the potentiometer clockwise.
If a background is detected, the yellow LED goes on.
Otherwise the yellow LED remains off with the
potentiometer standing at mechanical end stop (max.
sensitivity).
6. If a background was detected, turn the potentiometer
to the middle position between the two determined
switching points.
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Excess gain
BOS 18M-...-ID20
BOS 18M-...-ID23
BOS 18M-...-ID25
Fig. 4: Excess gain depending on distance
The excess gain is a unitless factor which indicates how
much more light reaches the receiver than is necessary for
function of the sensor. The larger the factor, the more
stable the sensor operates.
For applications in dirty surroundings a higher excess gain
is needed than under laboratory conditions. The maximum
range of the sensor should therefore not always be used.
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