Page 651 - Sensors and Systems - North American Catalog
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Ultrasonic Sensors
3
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Ultrasonic Sensors
Introduction
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 (Pump up/Pump down)
In hysteresis mode, the evaluation window is limited by two switch 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 switch point. Both switch 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
NPN/PNP/push-pull transistor output
Ultrasonic sensors can have NPN, PNP, or push-pull outputs.
Relay output
A number of ultrasonic sensors feature relay outputs. Please refer to the
individual data sheets for the maximum switching loads and electrical
design of the sensors. Information related to the mechanical service life
refers to the number of switching actions of the relay contacts in a no-load
condition. This value can also be reached with low electrical contact loads.
At the rated load for the electrical contacts, the service life is reduced to the
value indicated for the electrical service life. The life time data stated are
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 distance.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.
Programming is done with the ULTRA 3000 service program or a terminal
program and individual commands. A list of available commands is included
in Ultra 3000 manual. Programming and instructions are available on our
website.
IO-Link
The bidirectional IO-Link interface enables the user to access the switching
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
programmed from the control unit. The IO-Link interface also transfers
diagnostic data from the sensor to the control unit.
4. Programming
ULTRA 3000
To simplify the sensor programming procedure, Ultra 3000 provides instant
communication between an RS-232 programmable ultrasonic sensor
(designated by “-R2” in model number) and a Windows-based computer.
You can easily set and view the sensor parameters, display the commands
sent to and received by the sensor, and display the most recently measured
distance. In addition, you have precise control of features not found in
ordinary sensors, including:
•
Sensing range and boundaries
•
Extended sensing ranges
•
Blind range
•
Sensitivity (beam width)
•
Number of pulses evaluated per output
•
Hysteresis
•
Sound burst times
•
Temperature offset
•
Output mode
You can download ULTRA 3000 at
(Products ->
Software) or by using a direct link on the product page for each sensor
compatible with ULTRA 3000.
SONPROG
The SONPROG PC interface and associated software enable the ultrasonic
sensors in F65 and F260 housing designs to be adjusted individually 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 range
•
End of the detection range
•
Averaging
•
Attenuation
•
Multiplex function
•
Temperature compensation
•
Function as a diffuse mode sensor or ultrasonic sensor
•
Level measurement mode
