Ultrasonic fork sensors for web guide and edge control
Ultrasonic fork barrier with
analogue output 0...10V
The analogue signal is a function
of lateral covering
For edge control and web guidance
For transparent foils
For contaminated air
High accuracy and temperature
High detection width
Small plane change error
High sampling rate
UPF-A 30/8 TOR 24 CA
UPF-A 60/8 TOR 24 CA
UPF-A 40/13 TOR 24 CA
UPF-A 70/13 TOR 24 CA
The new edge sensors type UPF-A TOR are based on the experience of SNT Sensortechnik AG with ultrasonic
through beam sensors. New software algorhythms and a unique SONARANGE ultrasonic transducer material
allow an accuracy and temperature stability so far only realized with optical systems. But the ultrasonic fork
barrier is much less sensitive to dirt and dust compared to optical sensors. Further more transparent materials
such as foils can be perfectly handled. The so called plane change error has been minimized to almost zero.
Together with the high sampling speed of the sensor this means that fast moving and thus fluttering webs are
The sensor can ideally be adjusted to the actual air conditions by the help of the teach-in function. Furthermore
acoustically transparent materials such as textiles can be measured. With teach-in the signal output can be
defined at fully closed as well as at fully open fork. In addition, the output signal can also be inverted via teach-in.
The new sensors can be teached by push buttons or through the connector. 3 LED
indicate the actual position in 5 steps.
larger fork widths are of particular interest if the
material web is vertically heavily flattering or if
it does not always pass at the same height.
The 5 advantages of SNT ultrasonic fork sensors
SNT ultrasonic transducers have a large
Result: large measurement range combined
with high linearity and resolution.
all new SONARANGE material of the ultrasonic
transducers has a Young’s modulus which is
constant up to higher temperatures compared
to the past.
Result: high temperature stability.
signals are compensated with computed data
as well as with a temperature sensor.
Result: precise operation up to 60°C.
The sensors have the teach-in feature.
Result: They can be adapted to the actual air
condition and the material.
Software and transducers are designed to
eliminate the influence of multiple echoes.
Result: Very small influence of plane change
and high measuring speed.
The UPF-A is
an ultrasonic through beam sensor with separated
transmitter and receiver. In contrast to
conventional barriers it does not offer a simple
on/off output signal, but it measures the degree of
covering of the ultrasonic receiver as a linear
analogue output signal. If the receiver is fully
covered, the output is 0V and if not covered at all
10V. With its large measuring range of 13mm it
is the perfect tool for
web guiding applications in dusty environment and
with transparent web material. This new sensor can
be used in packaging industry for web guiding
control. But many other applications are open to
this product, such as edge detection for many
Miniature ultrasonic fork
An alternative to optical fork barriers
Simple and quick mounting
Detection of parts in dirty environment
Detection of transparent parts
High switching speed
Water Tight, IP67, robust, oil resistant
UPF-B 80 PA 24 C
Fork barriers have
several advantages compared to standard
barriers. Transmitter and receiver are
perfectly aligned. Mounting is therfore very
easy. There is no mechanical misalignement
possible after mounting.
Ultrasonic fork sensors
in particular, are ideal if optical fork
sensors fail because of high pollution or
transparent objects. The UPF-B fork sensor
is compatible with optical fork sensors from
point of view of installation as well as
operation. It is suitable for detecting
parts or edge detection, and has a switching
speed of 500Hz which is very high for
ultrasonic sensors. Thanks to the new
transducer sealing made of Viton®
the UPF-B sensors are very robust against
many environmental influences. In particular
they are oil resistant, unlike many other
sensors for transparent labels
Different teach options
Remote teach with key-lock function
Two switching outputs independently adjustable
Detection of metallised-, transparent- and paper
Large fork width and fork depth
Robust metal casing
UPF-L 06 TDQA 24 C
The UPF-L ultrasonic label sensor
detects, despite of its large fork width,
very thin and transparent film labels
and offers enough space for thicker,
folded labels. A clear operating menu
with integrated display enables an
intuitive adjustment of the sensor
functions without operating manual.
The ultrasonic technology with SONARANGE
transducers is much superior to optical
and capacitive sensors in case of
transparent label material.
In addition to the label detection, the
UPF-L is suitable e.g. for edge
detection or the detection of small
holes or perforations.