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Photoelectric Sensors
Thru-beam Sensor BOS 21M-..-IE10/IS11-..
No. 831 768 E • Edition 0501
Thru-beam-Sensor
Receiver:
BOS 21M-PA-IE10-S4 (PNP)
BOS 21M-NA-IE10-S4 (NPN)
BOS 21M-PA-IE10-S4S (PNP)
BOS 21M-NA-IE10-S4S (NPN)
Emitter:
BOS 21M-XT-IS11-S4
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 (receiver only): The yellow LED
is on when the output is active.
Green LED
Power-on indicator (emitter only): The LED is on as soon
as the emitter is active.
Stability indicator (receiver only): The LED is on when the
sensor is ready and 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
2 Green LED:
3 Potentiometer: Sensitivity setting
Fig. 1: Display and operating elements
Connections
1 10...30 V DC
2 Receiver: Output (S4=N.C.; S4S=N.O.)
Emitter: Test+
3 0 V
4 Receiver: Output (S4=N.O.; S4S=N.C.)
Emitter: Test−
Fig. 2: M12 connector
3
indicator (receiver)
Stability indicator (receiver)
Ready indicator (emitter)
(receiver)
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
Test function
The test function is used to check for proper function of
the thru-beam sensor. The test inputs on the emitter (Pins
2 and 4) are used to turn off the emitter. To do this, apply
a voltage of 10...30 V DC on Test+ and 0 V DC on Test−.
The receiver output must switch every time the
corresponding voltage is applied to one of the test inputs.
If the output does not switch, the sensors are dirty or
incorrectly adjusted. If the test inputs will not be used, set
Pins 2 and 4 to 0 V.
Setting
1. Position the emitter and receiver opposite each other at
the desired distance.
2. Turn the sensitivity potentiometer to maximum (greatest
range).
3. Determine the on- and off switching point of the output
(yellow LED): move the emitter or receiver so that the
yellow LED turns on and off again.
4. Install the moved sensor in the middle of the two
determined switch points. The system will function
optimally when the green LED is on and the yellow LED
off.
In order to detect very small targets, reduce sensitivity
and thereby the range, and space the two sensors
accordingly (see Step 3).
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