Balluff BOS 18M-NA-LR20-S4 Betriebsanleitung Seite 3

Photoelectric Sensors BOS 18M
Laser retro-reflective sensor with polarizing filter
Order code Laser retro-reflective
BOS01NE
BOS01R5
BOS01R4
BOS0272
– Laser red light, highly visible light spot for ease of alignment
– Strong light source and collimated beam for long range
– High-quality polarization filters for enhanced immunity to reflective surfaces and
accurate detection of shiny objects
– Optical bandpass filter for greatest possible ambient light rejection
– Function reserve indication for high operating reliability
– Rugged housing
Safety Notes
These photoelectric sensors may not be used in
applications where personal safety depends on
proper function of the devices (not safety
designed per EU machine guideline). Read
these operating instructions carefully before
putting the device into service.
Caution! Laser beam!
Temporary glare and irritation of eyes might occur.
DO NOT LOOK INTO THE LASER BEAM!
The CE Marking confirms that our products
conform to the EC Directives 2004/108/EEC
(EMC) and the EMC Law.
In our EMC Laboratory, which is accredited by
the DATech for Testing of Electromagnetic
Compatibility, proof has been documented that
these Balluff products meet the EMC require-
ments of the harmonized standard EN 60947-5-2.
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. 1: Display and operating elements
Green LED: power indicator/error
– LED on: the sensor is operating.
– LED flashes: short circuit or output overload at pin 4.
Yellow LED: indicator of light reception / limit range
– LED on: light at receiver, function reserve > 1.5
– LED flashes: light at receiver, function reserve < 1.5
Potentiometer
Serves for precise setting of switching point.
www.balluff.com
BOS 18M-PA-LR20-S4 PNP N.O.-N.C.
BOS 18M-NA-LR20-S4 NPN N.O.-N.C.
BOS 18M-PS-LR20-S4 PNP N.O.
BOS 18M-PA-LR20-S4S PNP N.O.-N.C.
Approvals
Installation
Caution!
Do not look into the laser beam.
The sensor must be installed as to prevent a direct line of
eyesight to the light source, even during operation.
For operation no further precautions are required (Laser class 1
acc. IEC60825-1:2014).
Receiver
LED green
LED yellow
Fig. 2: Dimensions
Wiring diagrams
pin 4-2
pin 4-2
pin 4
pin 2-4
Fig. 3: Connection diagram, pinouts
Setting
Standard setting (max. sensitivity)
1. Position sensor and reflector at the desired distance.
2. Turn potentiometer to max. sensitivity (clockwise).
3. Determine the switch-on and switch-off point of the
output (yellow LED): move the sensor in several direc-
tions so that the yellow LED goes on and again off.
Each change of switching state indicates a switching
point.
4. Install the sensor in the middle of the determined
switching points. The sensor is ideally aligned when the
yellow LED is on and indicates reliable function.
Fine adjustment for detecting very small objects
1. First perform the standard setting (see above).
2. Then turn the potentiometer counter-clockwise until the
yellow LED goes off. The reflector is no longer
Emitter detected.
3. Now turn the potentiometer slowly clockwise until the
yellow LED goes on. The reflector is detected again.
Now even very small objects can be sensed.
Excess gain
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
sensing range of the sensor should therefore not always be
used.
Fig. 4: Excess gain depending on distance
Sensing area lateral
Fig. 5: Switching points depending on distance
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