Balluff BOS 18M Serie Bedienungsanleitung Seite 4

Photoelectric sensors BOS 18M
Red light thru-beam
Test function (BOS 18M-XT only)
The test function is used to check for proper function of
the sensor. The test input on the emitter (Pin 4) is used to
turn off the emitter.
To do this, apply a voltage of 10...30 V DC on test input.
The receiver output must switch every time the correspon-
ding voltage is applied to the test input. If the output does
not switch, the sensors are dirty or incorrectly adjusted. If
the test input will not be used, set Pin 4 to 0 V or leave it
disconnected.
Setting
Standard setting (max. sensitivity)
1. Position the emitter and receiver at the desired
distance.
2. Turn potentiometer to max. sensitivity (clockwise).
3. Determine the turn-on and turn-off point of the output
(yellow LED): Move emitter or receiver in several direc-
tions so that the switching state of the yellow LED on
the receiver changes (on or off). Each switching state
change indicates a switching point.
4. Install the sensor that has been moved in the middle of
the determined switching points.
Fine adjustment for detecting very small objects
1. First perform the standard setting (see above).
2. Then turn the potentiometer at the receiver counter-
clockwise until the yellow LED at the receiver goes off.
The emitter will no longer be detected.
3. Now turn the potentiometer slowly clockwise until the
yellow LED goes on. The emitter will be detected again.
Now even very small objects can be detected.
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Excess gain
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.
Sensing area lateral, light spot size typical
Fig. 5: Switching points and light spot size depending on
distance
Technical data
Optical
Functional principle thru-beam
Sensing range 20 m
Light type LED, red light
Wave lenght l
620...670 nm
Risk Group acc. to IEC 62471:2008 Exempt group
Electrical
Supply voltage U 10...30 V DC
B
Reverse polarity protected yes
Rated operating voltage U 24 V DC
e
No-load current I
O
Emitter BOS 18M-..-RS21 < 16 mA
Receiver BOS 18M-PS/PO-... < 12 mA
Receiver BOS 18M-PA/NA-... < 14 mA
Effective operating current I 100 mA each output
e
Short circuit protected yes, both outputs
0.2 µF
Max. capacitance for U
e
Voltage drop Ud at I < 2.5 V
e
Turn-on delay < 0.65 ms
Turn-off delay < 0.65 ms
Switching frequency f 800 Hz
Switching output see type list
Switching function see type list
Output function optical
BOS 18M-PS-...-S4 dark-on (Pin 4)
BOS 18M-PO-...-S4 light-on (Pin 2)
BOS 18M-PA/NA-...-S4 light-on (Pin 2)
dark-on (Pin 4)
BOS 18M-PA-...-S4S light-on (Pin 4)
dark-on (Pin 2)
BOS 18M-PO-...-S4S light-on (Pin 4)
Input function emitter test input (Pin 4)
Sensitivity setting single turn potentiometer
Utilization category DC 13
Protection class II
Rated insulation voltage 75 V DC
Mechanical
Connection type M12-connector, 4-pin
Housing material CuZn nickel plated
Active surface material Glass
Tightening torque
area B1 (fig. 2) 15 Nm
area B2 30 Nm
Housing dimensions 75 mm, Ø M18x1
Weight < 50 g
Ambient
Ambient temperature T –5... +55°C
a
Enclosure rating per IEC 60529 IP 67
Ambient light rejection 10 kLux
Balluff GmbH
Schurwaldstrasse 9
73765 Neuhausen a.d.F.
Germany
Phone + 49 7158 173-0
Fax +49 7158 5010
balluff@balluff.de
www.balluff.com
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