Re US3 User manual

.ENG.

US3

Ultrasonic sensor

USER’S MANUAL

Re S.p.A. US3

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.

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