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Ultrasonic Sensors
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Consider the General Notes on the Information in the Pepperl+Fuchs Product Catalogs
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6.
Installation and operation
Ultrasonic sensors can be installed and operated in any location. Howev-
er, the excessive build-up of dust or dirt should be avoided. When clean-
ing the ultrasonic sensors, make sure that the sensor area (decoupling
layer) and the integral foam surrounding the converter are not damaged.
Water droplets or crusting on the decoupling layer affect the functioning
of the ultrasonic sensor. Minor deposits of dust are not critical.
Actuating direction
The objects to be detected can enter into the sound beam from all sides.
The anticipated trip points are defined based on the detection ranges and
response curves specified in the data sheets.
Deflection of the beam angle
The beam angle can be deflected using flat, level reflectors. However, the
signal may not be deflected more than twice because the
signal attenuation that occurs with each deflection reduces the detection
range.
Note:
The reflector areas must be accurately aligned. For some of its sensor
types, Pepperl+Fuchs offers reflectors designed for 90° angle deflection.
Mutual interference
To prevent mutual interference, the minimum distances between sensors
with the same detection range must be taken into account, as specified
in the following graphics.
X
m
X
m
X
Detection range
mm
Detection range
mm
to 500
to 2000
to 4000
to 6000
> 0.3
> 1.0
> 2.0
> 2.5
The specified values are to be taken as guidelines.They apply if the beam
angles are aligned parallel to one another and the object surfaces are
located at right angles to the axes of the beam angle.The actual required
distance "X" depends on the alignment, the type of target to be detected,
and the conditions relating to other objects that are located in the beam
angle.
X
The distances specified below must be taken into account when mount-
ing sensors opposite one another.
X'
m
X'
m
X'
Detection range
mm
Detection range
mm
to 500
to 2000
to 4000
to 6000
> 2.0
> 8.0
> 16.0
> 25.0
If interference occurs, it may be necessary to increase the distance "X"
or activate the synchronization function if required. Pepperl+Fuchs offers
a range of sensors that are fitted with synchronization inputs for this pur-
pose. These sensors can be used in synchronous or multiplex mode.
Synchronization can be achieved using an external synchronization sig-
nal
or even through self-synchronization for some sensor types. Synchro-
nized and unsynchronized sensors must not be mounted opposite each
other.
Avoiding interference
If several sensors are operated in very close proximity to each other, they
can cause mutual interference, meaning that reliable detection is no lon-
ger possible. Synchronizing the transfer cycles for all sensors makes it
possible to reduce the interference-free minimum distance between the
sensors.
Multiplex mode
Operating the sensor in multiplex mode enables ultrasonic bursts to be
staggered, which prevents one or more units from emitting signals at the
same time.
Introduction
