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Ultrasonic Sensors
3
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Consider the General Notes on the Information in the Pepperl+Fuchs Product Catalogs
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Retroflective mode
In retroflective mode, a fixed reflector is positioned.
The sensor output switches in the following cases:
•
The sensor detects an object that is located in front of the reflector.
The echo from the reflector must not necessarily be suppressed.
•
The sensor does not receive an echo.
This can be caused by sound-absorbent material or an inclined reflector.
The position of the reference reflector must not be changed.
Unusable area
A1
Presence of object
Absence of object
Sensor
Reference-
reflector
Small
object
Large
object
Inclined
object
∆
E
Hysteresis mode
In hysteresis mode, the evaluation window is limited by two trip points
(
near and far). If the object approaches the near switch point, the state of
the switching output changes.To change the state of the switching output
again, the object must reach the far trip point. Both trip points create an
adjustable hysteresis window.
This operating mode can be used to control a pump. If the filling level
reaches the filler mark, the pump is switched on.The pump then switches
off again once the filling level has dropped to below the minimum level.
3.
Electric outputs
For an overview of electric output types for our sensors,
onwards in our catalog.
NPN/PNP/push-pull transistor output
Ultrasonic sensors can have NPN, PNP, or push-pull outputs.
Relay output
Different ultrasonic sensors have relay contact outputs. The maximum
switching power and type of voltage are included in the respective data
sheet. The mechanical service life data relates to the number of switch-
ing operations for the unloaded relay contacts.These values are reached
with a low electric load. Under nominal load, the service life reduces to
that of the value specified for the electric service life.The service life data
relates to MTBF values.
Analog output
Analog outputs are available as current outputs and voltage outputs. The
output current and output voltage are proportional to the object's dis-
tance. The limits of the analog window can be programmed within the
measuring range.
Serial interface
Sensors with a serial interface can be programmed via this interface.The
measured distance of the object and the switching states are transferred.
Parameterization is carried out using the ULTRA 3000 service program
or a terminal program and individual commands. A list of available com-
mands is included in the respective sensor data sheets.
IO-Link
The bidirectional IO-Link interface enables the user to access the switch-
ing states and the object distance information directly in the control unit
without the need for a complex analog value transfer. The sensor can
be easily parameterized from the control unit. The IO-Link interface also
transfers diagnosis data from the sensor to the control unit.
4.
Programming
ULTRA 3000
The ULTRA 3000 parameterization software facilitates sensor program-
ming by providing direct communication between an RS232 program-
mable ultrasonic sensor and a Windows computer.You can easily define
and display the sensor parameters, display the commands transferred
to and from the sensor, and call up the last measured distance.You also
have precise control of functions that are not available in normal sensors,
such as:
•
Detection range and limits
•
Extended detection ranges
•
Blind zone
•
Sensitivity (sound beam width)
•
Number of pulses evaluated per output
•
Hysteresis
•
Sound burst times
•
Temperature offset
•
Output mode
You can download ULTRA 3000 free of charge at
com (Products -> Software) or via a direct link on the product page for
each sensor compatible with ULTRA 3000.
SONPROG
The SONPROG PC interface and associated software enable the ultra-
sonic sensors in F65 and F260 housing designs to be adjusted individu-
ally in line with the needs of the respective application. For example, the
following parameters can be set:
•
Start and end of the switching range
•
Hysteresis
•
Switching frequency
•
Start and end of the analog characteristic
•
Analog characteristic rising or falling
•
End of the blind zone
•
End of the detection range
•
Averaging
•
Attenuation
•
Multiplex function
•
Temperature compensation
•
Function as a diffuse mode sensor or ultrasonic sensor
•
Level measurement mode
Introduction
