Re US3 User manual

.ENG.
US3
Ultrasonic sensor
USER’S MANUAL

Re S.p.A. US3
I
Contents
Warnings ........................................................................................................................................... 1
Ultrasonic sensor advantages........................................................................................................ 2
Ultrasonic sensor limitations.......................................................................................................... 2
Typical applications......................................................................................................................... 2
“Pulse-echo” measuring method ...................................................................................................3
Factors which influence measurement.......................................................................................... 3
Technical characteristics ................................................................................................................ 4
Installation ........................................................................................................................................ 4
Functioning of the device................................................................................................................ 8
General ....................................................................................................................................................8
Control panel...........................................................................................................................................8
LED bar ...............................................................................................................................................9
Status LED (green)..............................................................................................................................9
“Out of range” LED (red)......................................................................................................................9
Keys ....................................................................................................................................................9
Programming menu ....................................................................................................................... 10
Calibration....................................................................................................................................... 11
“Field” calibration by maximum and middle diameter.........................................................................12
“Lab” calibration by maximum diameter and axis...............................................................................13
Configuration of the sensor as distance reader ......................................................................... 14
Detailed description of the functions...........................................................................................15
F1 - Regulated output type selection (Volt o mA) ..............................................................................15
F2 - Minimum distance calibration (maximum diameter) ...................................................................15
F3 - Middle diameter calibration - only for field calibration................................................................16
F4 - Maximum distance calibration (axis calibration) - only for lab calibration ...................................16
F5 - Setting 1st alarm threshold..........................................................................................................17
F6 - Setting 2nd alarm threshold.........................................................................................................17
F7 - Regulated output inversion.........................................................................................................17
F8 - Led bar mode .............................................................................................................................18
F9 - Thermal probe exclusion ............................................................................................................18
F10 - Exit menu saving the data ........................................................................................................18
Reset .................................................................................................................................................18
Setpoint ........................................................................................................................................... 19
Electrical and mechanical characteristics................................................................................... 20
Mechanical dimensions................................................................................................................. 21
Electrical connection diagrams.................................................................................................... 22
Guarantee........................................................................................................................................ 23

Re S.p.A. US3
Rev.12/04/11 1/23
Warnings
The present manual is for device fitters and operators. It provides indications on the intended use of the
device, technical specifications and instructions for installation, adjustment and use.
This manual is an integral part of the device and must be kept until the device is decommissioned. It reflects
the technical state of the device at the time of its sale.
The plant builder may include the present manual in the documentation for plant use.
Re S.p.A. reserves the right to update its production and/or manuals without updating products already sold
and previous manuals.
Since the device forms part of a plant, the plant builder is responsible for ensuring that all parts comply with
the laws in force in the country in which it is installed.
The device must be fitted and adjusted by qualified technical personnel.
It may be moved manually.
Information about device recovery
- In European Union member states
The device falls within the electrical and electronic equipment category, which must be disposed of not
amongst undifferentiated urban waste, but through separate collection. Therefore, at the end of the
device’s lifetime, it must be disposed of in conformity with the European standards adopted in the
member state in which it was installed.
WEEE (Waste Electrical and Electronic Equipment) may be intended for individual, collective or mixed
collection and recovery systems at designated centres (for more information contact the relevant local
authorities) or may be returned to the distributor when a new item of equipment is purchased. This
eliminates or reduces potentially negative effects on the environment deriving from improper use of the
equipment or parts of it.
For correct waste management, the relevant authorities promote the reduction of final waste disposal by
means of re-use, recycling and other forms of recovery to obtain raw materials from waste.
In the event of illegal disposal of WEEE, offenders will be punished in accordance with the sanctions
established by the member state in which it was installed.
- In non-EU countries
Recovery and final disposal of the device must be carried out in conformity with the standards in force in
the country in which it was installed. It may be advisable to take into account the information provided
regarding European Union member states.
The device bears a clear, visible and indelible indication allowing identification of the
manufacturer and the separate collection symbol (symbol on side).
This symbol, showing a wheelie bin with a cross through it, unequivocally indicates that
the device was released after 13.08.2005 and that it must be subject to separate
collection.

Re S.p.A. US3
Rev.12/04/11 2/23
Ultrasonicsensoradvantages
Ultrasonic sensors are extremely advantageous in comparison with other sensor types:
They are able to “see” any non-sound-absorbent material and some kinds of sound-absorbent
materials.
Material colour has no effect on reading.
Target object surface has no effect on reading.
Ultrasonic sensors work in most environmental conditions (e.g. foggy, dusty, dirty, brightly lit, and
very dark).
Ultrasonic sensors are able to read transparent materials.
Ultrasonic sensors are able to ignore background disturbances.
Ultrasonicsensorlimitations
They are not suitable for detecting materials particularly good at absorbing sound.
They have a relatively low propagation speed, limiting the sensor reading speed.
They do not work in water, in high pressure or vacuum environments.
They may be affected by the presence of nearby ultrasound sources (e.g.: other ultrasonic sensors or
compressed air guns).
Typicalapplications
Laminated materials tension control.
Winding and unwinding converting industrial machinery roll diameter measurement (cutter,
rotogravure, cutting and winding machines, wrinkling machines).
Diameter roll measurement for positioning and working phase starting.
Diameter reel measurement (aluminium and sheet).
Distance measure.
Box inside liquid level measurement.
Full and empty box recognition.

Re S.p.A. US3
Rev.12/04/11 3/23
“Pulse-echo”measuringmethod
Every 100 milliseconds the US3 sensor emits an ultrasonic pulse at a frequency of 125kHz. The pulse
propagates in the air until it hits the target (positioned in front of the sensor) whose distance is to be
measured. The pulse is reflected (echo) by the object and picked up by the sensor which, based on the
time taken by the echo to return to the sensor and the sound propagation speed, calculates the distance
from the object.
After the pulse has been generated, the sensor is inhibited for a short time during which it cannot receive
the echo. This is a feature common to all “pulse-echo” sensors and defines the minimum distance which
can be measured.
Factorswhichinfluencemeasurement
Although ultrasonic sensors can operate in adverse environmental conditions, it is important to consider
several factors which affect measurement quality, so as to achieve the best possible performance:
The speed of the sound varies with the temperature, causing a measurement percentage error of
around 0.17%/°C. US3 has an internal temperature sensor which allows that error to be
compensated for automatically.
Big changes in temperature along the measuring path cannot be compensated for and may result in
sound diffraction and scattering.
Changes in atmospheric pressure do not affect measurements. We strongly advise against the use
of ultrasonic sensors in pressurised or vacuum environments, since there may be a significant
distortion in the reading.
The presence of nebulised liquids or powders in the air attenuates the sound, reducing the maximum
reading distance.
Draughts may divert the echo and prevent correct measurement.
Other ultrasound sources may overlap the echo, causing measurement errors.
Moisture may cause a temporary drop in reading sensitivity without damaging the sensor. Do not
allow ice to form on the surface of the sensor.
Small amounts of dust do not affect measurements. But it is important to keep the sensor clean. Do
not paint the surface of the ultrasonic capsule.
Clean the sensor with low pressure dry air.

Re S.p.A. US3
Rev.12/04/11 4/23
Technicalcharacteristics
Operating frequency: 125kHz
Minimum measuring distance: 150mm at 25°C (160mm at 50°C )
Maximum measuring distance: 1800mm
(for materials which absorb sound: this is reduced in proportion to
the degree to which the material absorbs sound)
Operating mode: - Diameter reader / Regulator (resolution 0.5mm)
2 analog outputs: - Proportional diametral output 0-10V
- Regulated diametral output 0-10V or 4-20mA
(possibility of inverting the regulated diametral output)
Setpoint analog input
10V reference voltage for setpoint external potentiometer connection
Software filter to prevent sudden changes in distance
2 digital outputs for alarms with programmable threshold
10-position multi-purpose LED bar
Target present indicator
Automatic compensation of change in speed of sound with temperature
RS-485 for connection to Personal Computer
Power supply: 24V dc
Installation
To ensure that the device is installed efficiently, follow the instructions below:
1. Even if the device can function properly at a voltage that varies between 18 and 30Vdc, always supply
a stabilised voltage that is not affected by network load variations.
2. Never leave a break in the cable shielding. If a connector or joint has to be inserted in the US3
cable, make the connection as shown as shown in the diagram:
3. The CLAMP ferrite provided with the equipment must be applied to the cable.

Re S.p.A. US3
Rev.12/04/11 5/23
4. Avoid using single wires connections to the US3 cable, if it is possible.
5. Below is the sensor directivity graph, with an action cone of approximately +/-10°. Install the sensor so
that inside said cone there are no: objects other than the target, other ultrasound sources, draughts.

Re S.p.A. US3
Rev.12/04/11 6/23
6. Use the metal bracket supplied to support the US3, making sure that the capsule is parallel with the
plane at a tangent to the surface to be measured. Connect the sensor body to the nearest machine
earth point with a suitable cable, as illustrated below.

Re S.p.A. US3
Rev.12/04/11 7/23
7. Be sure that between the sensor body and the machine framework there is electrical continuity
8. Adjust the sensor angle so that the target is at the centre of the action cone. Tighten the knob to secure
it.