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Photoelectric Sensors
Retro-reflective Sensor BOS 21M-..-PR10-..
No. 832 158 E • Edition 0503
Safety Advisory
The system is not permitted for use in applications
where personal safety depends on proper function
of the device.
The CE-Marking means that our products
conform to the requirements of the EC Guidelines
89/336/EWG (EMC) and the EMC Statute.
Testing in our EMC Laboratory, which is accredited by
DATech for Testing of Electromagnetic Compatibility, has
shown that these Balluff products satisfy the EMC
requirements of the following Generic Standards:
− EN 50 081-2 (Emission) and
− EN 50 082-2 (Noise Immunity)
Display and operating elements
Yellow LED
Output function indicator: The yellow LED is on when the
output is active.
Green LED
Stability indicator: The green LED is on when the sensor
is ready and is working within a reliable range.
Potentiometer
Used to set the receiver sensitivity and range. Caution! Do
not turn the potentiometer beyond the 270° mechanical
stop.
1 Yellow LED: Output function
indicator
2 Green LED: Stability indicator
3 Potentiometer: Sensitivity setting
Fig. 1: Display and operating elements
Connections
1 10...30 V DC
2 Output (S4=N.C., S4S=N.O.)
3 0 V
4 Output (S4=N.O., S4S=N.C.)
Fig. 2: M12 connector
3
Retro-reflective sensor
BOS 21M-PA-PR10-S4 (PNP)
BOS 21M-NA-PR10-S4 (NPN)
BOS 21M-PA-PR10-S4S (PNP)
BOS 21M-NA-PR10-S4S (NPN)
Installation
There are three ways to attach the sensor:
1. Using two screws (M4) and washers through the
housing mounting holes.
2. Using a mounting bracket (available separately).
3. Using special clamps (available separately) and the
dovetail housing profile.
The operating distance is measured from the front surface
of the sensor optics.
The M12 connector can be oriented at four different
ratchet positions of 0°, 90°, 180° or 270°.
Fig. 3: Dimensions
Settings
Standard setting
1. Position the sensor and reflector opposite each other at
the desired distance.
2. Turn the sensitivity potentiometer to maximum (greatest
range).
3. Determine the on- and off switch point of the output
(yellow LED): Move the sensor in all directions so that
the yellow LED comes on and goes out again.
4. Mount the sensor in the middle of the points defined.
Optimum operation is obtained when the green LED is
on to indicate reliable function.
Fine detection in order to detect very small targets
1. First perform the standard setting (see above).
2. Then turn the sensitivity potentiometer counterclock-
wise until the yellow LED turns on. The reflector will no
longer be detected.
3. Turn slowly the potentiometer again clockwise until the
yellow LED turns OFF. The reflector will be detected
again. Now even very small objects can be detected.
a Receiver axis
b Emitter axis
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