Balluff BOS 18MR-PA-PR20-S4 Betriebsanleitung Seite 3

BOS 18MR-PA-PR20-S4/S4S
Photoelectric Sensors – Red light retro-reflective sensor with polarizing filter
User's Guide
Order Code Retro-reflective
BOS026L
BOS027Z
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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! Red light beam!
Temporary glare and irritation of eyes might occur.
DO NOT LOOK INTO THE LIGHT BEAM!
The CE Mark verifies that our products
meet the requirements of the current
EMC Directive.
In our EMC laboratory, which is accredited by DATech for
testing electromagnetic compatibility, evidence has been
provided that the Balluff products satisfy the EMC
requirements of IEC 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
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
Serves for precise setting of switching point.
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BOS18MR-PA-PR20-S4 PNP N.O.-N.C. Pins 4-2
BOS18MR-PA-PR20-S4S PNP N.O.-N.C. Pins 2-4
High-grade polarization filter for reliable detection of glossy objects
and high immunity against mirror reflection
Optical bandpass filter for greatest possible ambient light rejection
Excess gain indicator for high operating reliability
Rugged housing
Highly visible light spot for ease of alignment
Installation
Caution!
Do not look into the light 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
(Exempt group acc. IEC 62471).
B1 = 7
B2
53
24
Sn
48
9
Emitter
75
91.6
Fig. 2: Dimensions
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
directions 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
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.
Wiring diagram
BOS 18MR-PA-PR20-S4
PNP
2
1
3
LED green
4
BOS 18MR-PA-PR20-S4S
PNP
LED yellow
Fig. 3: Wiring diagram, pinouts
Sensing area lateral, light spot size typical
200
150 switching point
BOS R -1
100
50
0
-50
-100
-150
-200
0 1
Fig. 4: Switching points and light spot size depending on distance
Excess gain
100
10
1 BN
+10...30 V DC
WH
2
Out
4 BK
Out
3 BU
– 0 V
typ. max. sensing range
1
0 1
1 BN
+10...30 V DC
2 WH
Out
4 BK
Fig. 5: Excess gain depending on distance
Out
3 BU
– 0 V
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 greater excess gain
is needed than under laboratory conditions. The maximum
sensing range of the sensor should therefore not always be
used.
Sensing range
BOS R-11, R-47
BOS R-1
BOS R-46
BOS R-9
BOS R-26
BOS R-50 (foil)
Fig. 6: Sensing range depending on distance
2 3 4 5 6 7
reflector distance [m]
2 3 4 5 6 7 8 9
reflector distance [m]
typ. max. sensing range
sensing range
0 1 2 3 4 5 6 7 8 9 10
reflector distance [m]
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